id	sid	tid	token	lemma	pos
ajst-31229	1	1	academic	academic	ADJ
ajst-31229	1	2	journal	journal	NOUN
ajst-31229	1	3	of	of	ADP
ajst-31229	1	4	science	science	NOUN
ajst-31229	1	5	and	and	CCONJ
ajst-31229	1	6	technology	technology	NOUN
ajst-31229	1	7	issn	issn	NOUN
ajst-31229	1	8	:	:	PUNCT
ajst-31229	1	9	2771	2771	NUM
ajst-31229	1	10	-	-	SYM
ajst-31229	1	11	3032	3032	NUM
ajst-31229	1	12	|	|	NOUN
ajst-31229	1	13	vol	vol	NOUN
ajst-31229	1	14	.	.	PROPN
ajst-31229	1	15	15	15	NUM
ajst-31229	1	16	,	,	PUNCT
ajst-31229	1	17	no	no	INTJ
ajst-31229	1	18	.	.	NOUN
ajst-31229	1	19	3	3	NUM
ajst-31229	1	20	,	,	PUNCT
ajst-31229	1	21	2025	2025	NUM
ajst-31229	1	22	120	120	NUM
ajst-31229	1	23	a	a	DET
ajst-31229	1	24	review	review	NOUN
ajst-31229	1	25	on	on	ADP
ajst-31229	1	26	large‐scale	large‐scale	NOUN
ajst-31229	1	27	underground	underground	ADJ
ajst-31229	1	28	hydrogen	hydrogen	NOUN
ajst-31229	1	29	storage	storage	NOUN
ajst-31229	1	30	technologies	technology	NOUN
ajst-31229	1	31	hao	hao	PROPN
ajst-31229	1	32	cheng	cheng	PROPN
ajst-31229	1	33	school	school	PROPN
ajst-31229	1	34	of	of	ADP
ajst-31229	1	35	petroleum	petroleum	NOUN
ajst-31229	1	36	engineering	engineering	NOUN
ajst-31229	1	37	,	,	PUNCT
ajst-31229	1	38	xi'an	xi'an	PROPN
ajst-31229	1	39	shiyou	shiyou	PROPN
ajst-31229	1	40	university	university	PROPN
ajst-31229	1	41	,	,	PUNCT
ajst-31229	1	42	xi’an	xi’an	PROPN
ajst-31229	1	43	,	,	PUNCT
ajst-31229	1	44	710065	710065	NUM
ajst-31229	1	45	,	,	PUNCT
ajst-31229	1	46	china	china	PROPN
ajst-31229	1	47	abstract	abstract	NOUN
ajst-31229	1	48	:	:	PUNCT
ajst-31229	1	49	hydrogen	hydrogen	NOUN
ajst-31229	1	50	,	,	PUNCT
ajst-31229	1	51	recognized	recognize	VERB
ajst-31229	1	52	as	as	ADP
ajst-31229	1	53	a	a	DET
ajst-31229	1	54	clean	clean	ADJ
ajst-31229	1	55	and	and	CCONJ
ajst-31229	1	56	sustainable	sustainable	ADJ
ajst-31229	1	57	energy	energy	NOUN
ajst-31229	1	58	carrier	carrier	NOUN
ajst-31229	1	59	,	,	PUNCT
ajst-31229	1	60	is	be	AUX
ajst-31229	1	61	gaining	gain	VERB
ajst-31229	1	62	increasing	increase	VERB
ajst-31229	1	63	attention	attention	NOUN
ajst-31229	1	64	due	due	ADP
ajst-31229	1	65	to	to	ADP
ajst-31229	1	66	its	its	PRON
ajst-31229	1	67	high	high	ADJ
ajst-31229	1	68	energy	energy	NOUN
ajst-31229	1	69	density	density	NOUN
ajst-31229	1	70	and	and	CCONJ
ajst-31229	1	71	low	low	ADJ
ajst-31229	1	72	environmental	environmental	ADJ
ajst-31229	1	73	impact	impact	NOUN
ajst-31229	1	74	.	.	PUNCT
ajst-31229	2	1	underground	underground	ADJ
ajst-31229	2	2	hydrogen	hydrogen	NOUN
ajst-31229	2	3	storage	storage	NOUN
ajst-31229	2	4	(	(	PUNCT
ajst-31229	2	5	uhs	uhs	NOUN
ajst-31229	2	6	)	)	PUNCT
ajst-31229	2	7	offers	offer	VERB
ajst-31229	2	8	a	a	DET
ajst-31229	2	9	feasible	feasible	ADJ
ajst-31229	2	10	solution	solution	NOUN
ajst-31229	2	11	to	to	PART
ajst-31229	2	12	balance	balance	VERB
ajst-31229	2	13	hydrogen	hydrogen	NOUN
ajst-31229	2	14	supply	supply	NOUN
ajst-31229	2	15	and	and	CCONJ
ajst-31229	2	16	demand	demand	NOUN
ajst-31229	2	17	on	on	ADP
ajst-31229	2	18	a	a	DET
ajst-31229	2	19	large	large	ADJ
ajst-31229	2	20	scale	scale	NOUN
ajst-31229	2	21	.	.	PUNCT
ajst-31229	3	1	this	this	DET
ajst-31229	3	2	review	review	NOUN
ajst-31229	3	3	comprehensively	comprehensively	ADV
ajst-31229	3	4	summarizes	summarize	VERB
ajst-31229	3	5	the	the	DET
ajst-31229	3	6	main	main	ADJ
ajst-31229	3	7	characteristics	characteristic	NOUN
ajst-31229	3	8	of	of	ADP
ajst-31229	3	9	hydrogen	hydrogen	NOUN
ajst-31229	3	10	under	under	ADP
ajst-31229	3	11	various	various	ADJ
ajst-31229	3	12	pvt	pvt	PROPN
ajst-31229	3	13	conditions	condition	NOUN
ajst-31229	3	14	,	,	PUNCT
ajst-31229	3	15	its	its	PRON
ajst-31229	3	16	environmental	environmental	ADJ
ajst-31229	3	17	benefits	benefit	NOUN
ajst-31229	3	18	,	,	PUNCT
ajst-31229	3	19	and	and	CCONJ
ajst-31229	3	20	the	the	DET
ajst-31229	3	21	rationale	rationale	NOUN
ajst-31229	3	22	for	for	ADP
ajst-31229	3	23	considering	consider	VERB
ajst-31229	3	24	underground	underground	ADJ
ajst-31229	3	25	storage	storage	NOUN
ajst-31229	3	26	.	.	PUNCT
ajst-31229	4	1	key	key	ADJ
ajst-31229	4	2	factors	factor	NOUN
ajst-31229	4	3	influencing	influence	VERB
ajst-31229	4	4	uhs	uhs	NOUN
ajst-31229	4	5	,	,	PUNCT
ajst-31229	4	6	including	include	VERB
ajst-31229	4	7	geochemical	geochemical	ADJ
ajst-31229	4	8	and	and	CCONJ
ajst-31229	4	9	microbial	microbial	ADJ
ajst-31229	4	10	reactions	reaction	NOUN
ajst-31229	4	11	and	and	CCONJ
ajst-31229	4	12	storage	storage	NOUN
ajst-31229	4	13	integrity	integrity	NOUN
ajst-31229	4	14	,	,	PUNCT
ajst-31229	4	15	are	be	AUX
ajst-31229	4	16	analyzed	analyze	VERB
ajst-31229	4	17	.	.	PUNCT
ajst-31229	5	1	the	the	DET
ajst-31229	5	2	principles	principle	NOUN
ajst-31229	5	3	of	of	ADP
ajst-31229	5	4	uhs	uhs	NOUN
ajst-31229	5	5	and	and	CCONJ
ajst-31229	5	6	the	the	DET
ajst-31229	5	7	types	type	NOUN
ajst-31229	5	8	of	of	ADP
ajst-31229	5	9	geological	geological	ADJ
ajst-31229	5	10	formations	formation	NOUN
ajst-31229	5	11	suitable	suitable	ADJ
ajst-31229	5	12	for	for	ADP
ajst-31229	5	13	storage	storage	NOUN
ajst-31229	5	14	—	—	PUNCT
ajst-31229	5	15	such	such	ADJ
ajst-31229	5	16	as	as	ADP
ajst-31229	5	17	salt	salt	NOUN
ajst-31229	5	18	caverns	cavern	NOUN
ajst-31229	5	19	,	,	PUNCT
ajst-31229	5	20	aquifers	aquifer	NOUN
ajst-31229	5	21	,	,	PUNCT
ajst-31229	5	22	and	and	CCONJ
ajst-31229	5	23	depleted	depleted	ADJ
ajst-31229	5	24	oil	oil	NOUN
ajst-31229	5	25	and	and	CCONJ
ajst-31229	5	26	gas	gas	NOUN
ajst-31229	5	27	reservoirs	reservoir	NOUN
ajst-31229	5	28	—	—	PUNCT
ajst-31229	5	29	are	be	AUX
ajst-31229	5	30	reviewed	review	VERB
ajst-31229	5	31	along	along	ADP
ajst-31229	5	32	with	with	ADP
ajst-31229	5	33	current	current	ADJ
ajst-31229	5	34	domestic	domestic	ADJ
ajst-31229	5	35	and	and	CCONJ
ajst-31229	5	36	international	international	ADJ
ajst-31229	5	37	projects	project	NOUN
ajst-31229	5	38	.	.	PUNCT
ajst-31229	6	1	special	special	ADJ
ajst-31229	6	2	focus	focus	NOUN
ajst-31229	6	3	is	be	AUX
ajst-31229	6	4	given	give	VERB
ajst-31229	6	5	to	to	ADP
ajst-31229	6	6	the	the	DET
ajst-31229	6	7	technical	technical	ADJ
ajst-31229	6	8	challenges	challenge	NOUN
ajst-31229	6	9	of	of	ADP
ajst-31229	6	10	using	use	VERB
ajst-31229	6	11	depleted	depleted	ADJ
ajst-31229	6	12	reservoirs	reservoir	NOUN
ajst-31229	6	13	,	,	PUNCT
ajst-31229	6	14	including	include	VERB
ajst-31229	6	15	issues	issue	NOUN
ajst-31229	6	16	of	of	ADP
ajst-31229	6	17	leakage	leakage	NOUN
ajst-31229	6	18	,	,	PUNCT
ajst-31229	6	19	trap	trap	NOUN
ajst-31229	6	20	and	and	CCONJ
ajst-31229	6	21	facility	facility	NOUN
ajst-31229	6	22	integrity	integrity	NOUN
ajst-31229	6	23	,	,	PUNCT
ajst-31229	6	24	and	and	CCONJ
ajst-31229	6	25	hydrogen	hydrogen	NOUN
ajst-31229	6	26	consumption	consumption	NOUN
ajst-31229	6	27	via	via	ADP
ajst-31229	6	28	sulfide	sulfide	NOUN
ajst-31229	6	29	reactions	reaction	NOUN
ajst-31229	6	30	.	.	PUNCT
ajst-31229	7	1	the	the	DET
ajst-31229	7	2	paper	paper	NOUN
ajst-31229	7	3	concludes	conclude	VERB
ajst-31229	7	4	that	that	SCONJ
ajst-31229	7	5	china	china	PROPN
ajst-31229	7	6	has	have	VERB
ajst-31229	7	7	strategic	strategic	ADJ
ajst-31229	7	8	advantages	advantage	NOUN
ajst-31229	7	9	in	in	ADP
ajst-31229	7	10	developing	develop	VERB
ajst-31229	7	11	uhs	uhs	NOUN
ajst-31229	7	12	due	due	ADP
ajst-31229	7	13	to	to	ADP
ajst-31229	7	14	abundant	abundant	ADJ
ajst-31229	7	15	geological	geological	ADJ
ajst-31229	7	16	resources	resource	NOUN
ajst-31229	7	17	,	,	PUNCT
ajst-31229	7	18	technological	technological	ADJ
ajst-31229	7	19	innovation	innovation	NOUN
ajst-31229	7	20	potential	potential	NOUN
ajst-31229	7	21	,	,	PUNCT
ajst-31229	7	22	and	and	CCONJ
ajst-31229	7	23	an	an	DET
ajst-31229	7	24	integrated	integrated	ADJ
ajst-31229	7	25	hydrogen	hydrogen	NOUN
ajst-31229	7	26	industry	industry	NOUN
ajst-31229	7	27	chain	chain	NOUN
ajst-31229	7	28	,	,	PUNCT
ajst-31229	7	29	although	although	SCONJ
ajst-31229	7	30	it	it	PRON
ajst-31229	7	31	is	be	AUX
ajst-31229	7	32	still	still	ADV
ajst-31229	7	33	in	in	ADP
ajst-31229	7	34	the	the	DET
ajst-31229	7	35	early	early	ADJ
ajst-31229	7	36	stages	stage	NOUN
ajst-31229	7	37	of	of	ADP
ajst-31229	7	38	development	development	NOUN
ajst-31229	7	39	.	.	PUNCT
ajst-31229	8	1	keywords	keyword	NOUN
ajst-31229	8	2	:	:	PUNCT
ajst-31229	8	3	underground	underground	ADJ
ajst-31229	8	4	hydrogen	hydrogen	NOUN
ajst-31229	8	5	storage	storage	NOUN
ajst-31229	8	6	;	;	PUNCT
ajst-31229	8	7	salt	salt	NOUN
ajst-31229	8	8	caverns	cavern	NOUN
ajst-31229	8	9	;	;	PUNCT
ajst-31229	8	10	depleted	depleted	ADJ
ajst-31229	8	11	gas	gas	NOUN
ajst-31229	8	12	reservoirs	reservoir	NOUN
ajst-31229	8	13	;	;	PUNCT
ajst-31229	8	14	geochemical	geochemical	ADJ
ajst-31229	8	15	reactions	reaction	NOUN
ajst-31229	8	16	;	;	PUNCT
ajst-31229	8	17	microbial	microbial	ADJ
ajst-31229	8	18	processes	process	NOUN
ajst-31229	8	19	;	;	PUNCT
ajst-31229	8	20	caprock	caprock	NOUN
ajst-31229	8	21	integrity	integrity	NOUN
ajst-31229	8	22	.	.	PUNCT
ajst-31229	9	1	1	1	X
ajst-31229	9	2	.	.	X
ajst-31229	9	3	introduction	introduction	NOUN
ajst-31229	9	4	hydrogen	hydrogen	NOUN
ajst-31229	9	5	has	have	AUX
ajst-31229	9	6	emerged	emerge	VERB
ajst-31229	9	7	as	as	ADP
ajst-31229	9	8	a	a	DET
ajst-31229	9	9	promising	promising	ADJ
ajst-31229	9	10	energy	energy	NOUN
ajst-31229	9	11	carrier	carrier	NOUN
ajst-31229	9	12	due	due	ADP
ajst-31229	9	13	to	to	ADP
ajst-31229	9	14	its	its	PRON
ajst-31229	9	15	high	high	ADJ
ajst-31229	9	16	gravimetric	gravimetric	ADJ
ajst-31229	9	17	energy	energy	NOUN
ajst-31229	9	18	density	density	NOUN
ajst-31229	9	19	,	,	PUNCT
ajst-31229	9	20	potential	potential	NOUN
ajst-31229	9	21	for	for	ADP
ajst-31229	9	22	zeroemission	zeroemission	NOUN
ajst-31229	9	23	energy	energy	NOUN
ajst-31229	9	24	systems	system	NOUN
ajst-31229	9	25	,	,	PUNCT
ajst-31229	9	26	and	and	CCONJ
ajst-31229	9	27	versatility	versatility	NOUN
ajst-31229	9	28	in	in	ADP
ajst-31229	9	29	various	various	ADJ
ajst-31229	9	30	applications	application	NOUN
ajst-31229	9	31	[	[	X
ajst-31229	9	32	1	1	NUM
ajst-31229	9	33	,	,	PUNCT
ajst-31229	9	34	2	2	NUM
ajst-31229	9	35	]	]	PUNCT
ajst-31229	9	36	.	.	PUNCT
ajst-31229	10	1	however	however	ADV
ajst-31229	10	2	,	,	PUNCT
ajst-31229	10	3	the	the	DET
ajst-31229	10	4	low	low	ADJ
ajst-31229	10	5	volumetric	volumetric	NOUN
ajst-31229	10	6	energy	energy	NOUN
ajst-31229	10	7	density	density	NOUN
ajst-31229	10	8	of	of	ADP
ajst-31229	10	9	hydrogen	hydrogen	NOUN
ajst-31229	10	10	at	at	ADP
ajst-31229	10	11	ambient	ambient	ADJ
ajst-31229	10	12	conditions	condition	NOUN
ajst-31229	10	13	,	,	PUNCT
ajst-31229	10	14	challenges	challenge	NOUN
ajst-31229	10	15	associated	associate	VERB
ajst-31229	10	16	with	with	ADP
ajst-31229	10	17	its	its	PRON
ajst-31229	10	18	storage	storage	NOUN
ajst-31229	10	19	and	and	CCONJ
ajst-31229	10	20	transport	transport	NOUN
ajst-31229	10	21	,	,	PUNCT
ajst-31229	10	22	as	as	ADV
ajst-31229	10	23	well	well	ADV
ajst-31229	10	24	as	as	ADP
ajst-31229	10	25	safety	safety	NOUN
ajst-31229	10	26	concerns	concern	NOUN
ajst-31229	10	27	related	relate	VERB
ajst-31229	10	28	to	to	ADP
ajst-31229	10	29	leakage	leakage	NOUN
ajst-31229	10	30	and	and	CCONJ
ajst-31229	10	31	embrittlement	embrittlement	NOUN
ajst-31229	10	32	,	,	PUNCT
ajst-31229	10	33	present	present	ADJ
ajst-31229	10	34	significant	significant	ADJ
ajst-31229	10	35	obstacles	obstacle	NOUN
ajst-31229	10	36	to	to	ADP
ajst-31229	10	37	its	its	PRON
ajst-31229	10	38	widespread	widespread	ADJ
ajst-31229	10	39	adoption	adoption	NOUN
ajst-31229	10	40	[	[	X
ajst-31229	10	41	2	2	NUM
ajst-31229	10	42	]	]	PUNCT
ajst-31229	10	43	.	.	PUNCT
ajst-31229	11	1	research	research	NOUN
ajst-31229	11	2	and	and	CCONJ
ajst-31229	11	3	applications	application	NOUN
ajst-31229	11	4	of	of	ADP
ajst-31229	11	5	underground	underground	ADJ
ajst-31229	11	6	hydrogen	hydrogen	NOUN
ajst-31229	11	7	storage	storage	NOUN
ajst-31229	11	8	have	have	AUX
ajst-31229	11	9	gained	gain	VERB
ajst-31229	11	10	traction	traction	NOUN
ajst-31229	11	11	both	both	CCONJ
ajst-31229	11	12	domestically	domestically	ADV
ajst-31229	11	13	and	and	CCONJ
ajst-31229	11	14	internationally	internationally	ADV
ajst-31229	11	15	in	in	ADP
ajst-31229	11	16	recent	recent	ADJ
ajst-31229	11	17	years	year	NOUN
ajst-31229	11	18	.	.	PUNCT
ajst-31229	12	1	in	in	ADP
ajst-31229	12	2	europe	europe	PROPN
ajst-31229	12	3	,	,	PUNCT
ajst-31229	12	4	projects	project	VERB
ajst-31229	12	5	such	such	ADJ
ajst-31229	12	6	as	as	ADP
ajst-31229	12	7	hyunder	hyunder	NOUN
ajst-31229	12	8	in	in	ADP
ajst-31229	12	9	germany	germany	PROPN
ajst-31229	12	10	have	have	AUX
ajst-31229	12	11	explored	explore	VERB
ajst-31229	12	12	the	the	DET
ajst-31229	12	13	feasibility	feasibility	NOUN
ajst-31229	12	14	of	of	ADP
ajst-31229	12	15	storing	store	VERB
ajst-31229	12	16	large	large	ADJ
ajst-31229	12	17	volumes	volume	NOUN
ajst-31229	12	18	of	of	ADP
ajst-31229	12	19	hydrogen	hydrogen	NOUN
ajst-31229	12	20	in	in	ADP
ajst-31229	12	21	porous	porous	ADJ
ajst-31229	12	22	geological	geological	ADJ
ajst-31229	12	23	formations	formation	NOUN
ajst-31229	12	24	,	,	PUNCT
ajst-31229	12	25	including	include	VERB
ajst-31229	12	26	salt	salt	NOUN
ajst-31229	12	27	caverns	cavern	NOUN
ajst-31229	12	28	and	and	CCONJ
ajst-31229	12	29	aquifers	aquifer	NOUN
ajst-31229	12	30	[	[	X
ajst-31229	12	31	3	3	NUM
ajst-31229	12	32	]	]	PUNCT
ajst-31229	12	33	.	.	PUNCT
ajst-31229	13	1	in	in	ADP
ajst-31229	13	2	the	the	DET
ajst-31229	13	3	united	united	PROPN
ajst-31229	13	4	states	states	PROPN
ajst-31229	13	5	,	,	PUNCT
ajst-31229	13	6	the	the	DET
ajst-31229	13	7	national	national	ADJ
ajst-31229	13	8	renewable	renewable	ADJ
ajst-31229	13	9	energy	energy	NOUN
ajst-31229	13	10	laboratory	laboratory	NOUN
ajst-31229	13	11	(	(	PUNCT
ajst-31229	13	12	nrel	nrel	NOUN
ajst-31229	13	13	)	)	PUNCT
ajst-31229	13	14	has	have	AUX
ajst-31229	13	15	conducted	conduct	VERB
ajst-31229	13	16	pilot	pilot	NOUN
ajst-31229	13	17	studies	study	NOUN
ajst-31229	13	18	on	on	ADP
ajst-31229	13	19	depleted	depleted	ADJ
ajst-31229	13	20	gas	gas	NOUN
ajst-31229	13	21	fields	field	NOUN
ajst-31229	13	22	as	as	ADP
ajst-31229	13	23	potential	potential	ADJ
ajst-31229	13	24	storage	storage	NOUN
ajst-31229	13	25	sites	site	NOUN
ajst-31229	13	26	[	[	X
ajst-31229	13	27	4	4	NUM
ajst-31229	13	28	]	]	PUNCT
ajst-31229	13	29	.	.	PUNCT
ajst-31229	14	1	in	in	ADP
ajst-31229	14	2	china	china	PROPN
ajst-31229	14	3	,	,	PUNCT
ajst-31229	14	4	institutions	institution	NOUN
ajst-31229	14	5	such	such	ADJ
ajst-31229	14	6	as	as	ADP
ajst-31229	14	7	the	the	DET
ajst-31229	14	8	china	china	PROPN
ajst-31229	14	9	university	university	PROPN
ajst-31229	14	10	of	of	ADP
ajst-31229	14	11	petroleum	petroleum	NOUN
ajst-31229	14	12	and	and	CCONJ
ajst-31229	14	13	sinopec	sinopec	PROPN
ajst-31229	14	14	have	have	AUX
ajst-31229	14	15	initiated	initiate	VERB
ajst-31229	14	16	studies	study	NOUN
ajst-31229	14	17	and	and	CCONJ
ajst-31229	14	18	pilot	pilot	NOUN
ajst-31229	14	19	demonstrations	demonstration	NOUN
ajst-31229	14	20	focusing	focus	VERB
ajst-31229	14	21	on	on	ADP
ajst-31229	14	22	depleted	depleted	ADJ
ajst-31229	14	23	oil	oil	NOUN
ajst-31229	14	24	and	and	CCONJ
ajst-31229	14	25	gas	gas	NOUN
ajst-31229	14	26	reservoirs	reservoir	NOUN
ajst-31229	14	27	and	and	CCONJ
ajst-31229	14	28	underground	underground	ADJ
ajst-31229	14	29	aquifers	aquifer	NOUN
ajst-31229	14	30	[	[	X
ajst-31229	14	31	5	5	NUM
ajst-31229	14	32	]	]	PUNCT
ajst-31229	14	33	.	.	PUNCT
ajst-31229	15	1	basic	basic	ADJ
ajst-31229	15	2	types	type	NOUN
ajst-31229	15	3	of	of	ADP
ajst-31229	15	4	gas	gas	NOUN
ajst-31229	15	5	storage	storage	NOUN
ajst-31229	15	6	facilities	facility	NOUN
ajst-31229	15	7	include	include	VERB
ajst-31229	15	8	salt	salt	NOUN
ajst-31229	15	9	caverns	cavern	NOUN
ajst-31229	15	10	,	,	PUNCT
ajst-31229	15	11	porous	porous	ADJ
ajst-31229	15	12	aquifers	aquifer	NOUN
ajst-31229	15	13	,	,	PUNCT
ajst-31229	15	14	and	and	CCONJ
ajst-31229	15	15	depleted	depleted	ADJ
ajst-31229	15	16	hydrocarbon	hydrocarbon	NOUN
ajst-31229	15	17	reservoirs	reservoir	NOUN
ajst-31229	15	18	.	.	PUNCT
ajst-31229	16	1	each	each	DET
ajst-31229	16	2	type	type	NOUN
ajst-31229	16	3	presents	present	VERB
ajst-31229	16	4	distinct	distinct	ADJ
ajst-31229	16	5	advantages	advantage	NOUN
ajst-31229	16	6	and	and	CCONJ
ajst-31229	16	7	technical	technical	ADJ
ajst-31229	16	8	challenges	challenge	NOUN
ajst-31229	16	9	in	in	ADP
ajst-31229	16	10	terms	term	NOUN
ajst-31229	16	11	of	of	ADP
ajst-31229	16	12	reservoir	reservoir	PROPN
ajst-31229	16	13	geology	geology	NOUN
ajst-31229	16	14	,	,	PUNCT
ajst-31229	16	15	integrity	integrity	NOUN
ajst-31229	16	16	,	,	PUNCT
ajst-31229	16	17	and	and	CCONJ
ajst-31229	16	18	operational	operational	ADJ
ajst-31229	16	19	costs	cost	NOUN
ajst-31229	16	20	[	[	X
ajst-31229	16	21	6	6	NUM
ajst-31229	16	22	]	]	PUNCT
ajst-31229	16	23	.	.	PUNCT
ajst-31229	17	1	the	the	DET
ajst-31229	17	2	key	key	ADJ
ajst-31229	17	3	factors	factor	NOUN
ajst-31229	17	4	influencing	influence	VERB
ajst-31229	17	5	underground	underground	ADJ
ajst-31229	17	6	hydrogen	hydrogen	NOUN
ajst-31229	17	7	storage	storage	NOUN
ajst-31229	17	8	encompass	encompass	NOUN
ajst-31229	17	9	geochemical	geochemical	ADJ
ajst-31229	17	10	and	and	CCONJ
ajst-31229	17	11	microbial	microbial	ADJ
ajst-31229	17	12	reactions	reaction	NOUN
ajst-31229	17	13	that	that	PRON
ajst-31229	17	14	may	may	AUX
ajst-31229	17	15	consume	consume	VERB
ajst-31229	17	16	hydrogen	hydrogen	NOUN
ajst-31229	17	17	or	or	CCONJ
ajst-31229	17	18	compromise	compromise	NOUN
ajst-31229	17	19	storage	storage	NOUN
ajst-31229	17	20	integrity	integrity	NOUN
ajst-31229	17	21	,	,	PUNCT
ajst-31229	17	22	as	as	ADV
ajst-31229	17	23	well	well	ADV
ajst-31229	17	24	as	as	ADP
ajst-31229	17	25	technical	technical	ADJ
ajst-31229	17	26	difficulties	difficulty	NOUN
ajst-31229	17	27	related	relate	VERB
ajst-31229	17	28	to	to	ADP
ajst-31229	17	29	reservoir	reservoir	NOUN
ajst-31229	17	30	permeability	permeability	NOUN
ajst-31229	17	31	,	,	PUNCT
ajst-31229	17	32	caprock	caprock	NOUN
ajst-31229	17	33	sealing	sealing	NOUN
ajst-31229	17	34	,	,	PUNCT
ajst-31229	17	35	and	and	CCONJ
ajst-31229	17	36	wellbore	wellbore	NOUN
ajst-31229	17	37	integrity	integrity	NOUN
ajst-31229	17	38	[	[	X
ajst-31229	17	39	5	5	NUM
ajst-31229	17	40	,	,	PUNCT
ajst-31229	17	41	7	7	NUM
ajst-31229	17	42	]	]	PUNCT
ajst-31229	17	43	.	.	PUNCT
ajst-31229	18	1	2	2	X
ajst-31229	18	2	.	.	X
ajst-31229	18	3	main	main	ADJ
ajst-31229	18	4	characteristics	characteristic	NOUN
ajst-31229	18	5	of	of	ADP
ajst-31229	18	6	hydrogen	hydrogen	NOUN
ajst-31229	18	7	2.1	2.1	NUM
ajst-31229	18	8	.	.	PUNCT
ajst-31229	19	1	physicochemical	physicochemical	ADJ
ajst-31229	19	2	properties	property	NOUN
ajst-31229	19	3	of	of	ADP
ajst-31229	19	4	hydrogen	hydrogen	NOUN
ajst-31229	19	5	hydrogen	hydrogen	NOUN
ajst-31229	19	6	exhibits	exhibit	VERB
ajst-31229	19	7	a	a	DET
ajst-31229	19	8	low	low	ADJ
ajst-31229	19	9	molecular	molecular	ADJ
ajst-31229	19	10	weight	weight	NOUN
ajst-31229	19	11	(	(	PUNCT
ajst-31229	19	12	2g	2g	NOUN
ajst-31229	19	13	/	/	SYM
ajst-31229	19	14	mol	mol	NOUN
ajst-31229	19	15	)	)	PUNCT
ajst-31229	19	16	and	and	CCONJ
ajst-31229	19	17	a	a	DET
ajst-31229	19	18	correspondingly	correspondingly	ADV
ajst-31229	19	19	low	low	ADJ
ajst-31229	19	20	density	density	NOUN
ajst-31229	19	21	:	:	PUNCT
ajst-31229	19	22	approximately	approximately	ADV
ajst-31229	19	23	0.0899	0.0899	NUM
ajst-31229	19	24	kg	kg	NOUN
ajst-31229	19	25	/	/	SYM
ajst-31229	19	26	m³	m³	VERB
ajst-31229	19	27	at	at	ADP
ajst-31229	19	28	standard	standard	ADJ
ajst-31229	19	29	temperature	temperature	NOUN
ajst-31229	19	30	and	and	CCONJ
ajst-31229	19	31	pressure	pressure	NOUN
ajst-31229	19	32	(	(	PUNCT
ajst-31229	19	33	stp	stp	ADJ
ajst-31229	19	34	,	,	PUNCT
ajst-31229	19	35	0	0	NUM
ajst-31229	19	36	°	°	NOUN
ajst-31229	19	37	c	c	NOUN
ajst-31229	19	38	,	,	PUNCT
ajst-31229	19	39	1	1	NUM
ajst-31229	19	40	atm	atm	NOUN
ajst-31229	19	41	)	)	PUNCT
ajst-31229	20	1	[	[	X
ajst-31229	20	2	8	8	NUM
ajst-31229	20	3	]	]	PUNCT
ajst-31229	20	4	.	.	PUNCT
ajst-31229	21	1	when	when	SCONJ
ajst-31229	21	2	compressed	compress	VERB
ajst-31229	21	3	to	to	ADP
ajst-31229	21	4	200	200	NUM
ajst-31229	21	5	bar	bar	NOUN
ajst-31229	21	6	,	,	PUNCT
ajst-31229	21	7	its	its	PRON
ajst-31229	21	8	density	density	NOUN
ajst-31229	21	9	increases	increase	VERB
ajst-31229	21	10	to	to	ADP
ajst-31229	21	11	approximately	approximately	ADV
ajst-31229	21	12	16	16	NUM
ajst-31229	21	13	kg	kg	NOUN
ajst-31229	21	14	/	/	SYM
ajst-31229	21	15	m³	m³	VERB
ajst-31229	21	16	,	,	PUNCT
ajst-31229	21	17	while	while	SCONJ
ajst-31229	21	18	liquid	liquid	ADJ
ajst-31229	21	19	hydrogen	hydrogen	NOUN
ajst-31229	21	20	at	at	ADP
ajst-31229	21	21	−253	−253	PROPN
ajst-31229	21	22	°	°	ADP
ajst-31229	21	23	c	c	PROPN
ajst-31229	21	24	achieves	achieve	VERB
ajst-31229	21	25	a	a	DET
ajst-31229	21	26	density	density	NOUN
ajst-31229	21	27	of	of	ADP
ajst-31229	21	28	about	about	ADV
ajst-31229	21	29	70	70	NUM
ajst-31229	21	30	kg	kg	NOUN
ajst-31229	21	31	/	/	SYM
ajst-31229	21	32	m³	m³	PROPN
ajst-31229	22	1	[	[	X
ajst-31229	22	2	9	9	NUM
ajst-31229	22	3	]	]	PUNCT
ajst-31229	22	4	.	.	PUNCT
ajst-31229	23	1	in	in	ADP
ajst-31229	23	2	comparison	comparison	NOUN
ajst-31229	23	3	,	,	PUNCT
ajst-31229	23	4	methane	methane	NOUN
ajst-31229	23	5	at	at	ADP
ajst-31229	23	6	stp	stp	PROPN
ajst-31229	23	7	has	have	VERB
ajst-31229	23	8	a	a	DET
ajst-31229	23	9	density	density	NOUN
ajst-31229	23	10	of	of	ADP
ajst-31229	23	11	0.656	0.656	NUM
ajst-31229	23	12	kg	kg	NOUN
ajst-31229	23	13	/	/	SYM
ajst-31229	23	14	m³	m³	ADJ
ajst-31229	23	15	,	,	PUNCT
ajst-31229	23	16	and	and	CCONJ
ajst-31229	23	17	compressed	compress	VERB
ajst-31229	23	18	natural	natural	ADJ
ajst-31229	23	19	gas	gas	NOUN
ajst-31229	23	20	(	(	PUNCT
ajst-31229	23	21	cng	cng	NOUN
ajst-31229	23	22	)	)	PUNCT
ajst-31229	23	23	at	at	ADP
ajst-31229	23	24	200	200	NUM
ajst-31229	23	25	bar	bar	NOUN
ajst-31229	23	26	reaches	reach	VERB
ajst-31229	23	27	about	about	ADV
ajst-31229	23	28	180	180	NUM
ajst-31229	23	29	kg	kg	NOUN
ajst-31229	23	30	/	/	SYM
ajst-31229	23	31	m³	m³	PROPN
ajst-31229	24	1	[	[	X
ajst-31229	24	2	9	9	NUM
ajst-31229	24	3	]	]	PUNCT
ajst-31229	24	4	.	.	PUNCT
ajst-31229	25	1	table	table	NOUN
ajst-31229	25	2	1	1	NUM
ajst-31229	25	3	.	.	PUNCT
ajst-31229	26	1	physical	physical	ADJ
ajst-31229	26	2	properties	property	NOUN
ajst-31229	26	3	of	of	ADP
ajst-31229	26	4	hydrogen	hydrogen	NOUN
ajst-31229	26	5	and	and	CCONJ
ajst-31229	26	6	methane	methane	NOUN
ajst-31229	26	7	property	property	NOUN
ajst-31229	26	8	hydrogen	hydrogen	NOUN
ajst-31229	26	9	(	(	PUNCT
ajst-31229	26	10	h₂	h₂	PROPN
ajst-31229	26	11	)	)	PUNCT
ajst-31229	26	12	methane	methane	NOUN
ajst-31229	26	13	(	(	PUNCT
ajst-31229	26	14	ch₄	ch₄	PROPN
ajst-31229	26	15	)	)	PUNCT
ajst-31229	26	16	molecular	molecular	ADJ
ajst-31229	26	17	weight	weight	NOUN
ajst-31229	26	18	(	(	PUNCT
ajst-31229	26	19	g	g	NOUN
ajst-31229	26	20	/	/	SYM
ajst-31229	26	21	mol	mol	NOUN
ajst-31229	26	22	)	)	PUNCT
ajst-31229	26	23	2.016	2.016	NUM
ajst-31229	26	24	16.043	16.043	NUM
ajst-31229	26	25	density	density	NOUN
ajst-31229	26	26	(	(	PUNCT
ajst-31229	26	27	kg	kg	NOUN
ajst-31229	26	28	/	/	SYM
ajst-31229	26	29	m³	m³	ADJ
ajst-31229	26	30	)	)	PUNCT
ajst-31229	26	31	0.082	0.082	NUM
ajst-31229	26	32	0.657	0.657	NUM
ajst-31229	26	33	viscosity	viscosity	NOUN
ajst-31229	26	34	(	(	PUNCT
ajst-31229	26	35	pa·s	pa·s	NOUN
ajst-31229	26	36	)	)	PUNCT
ajst-31229	26	37	0.89	0.89	NUM
ajst-31229	26	38	×	×	NOUN
ajst-31229	26	39	10⁻⁵	10⁻⁵	NUM
ajst-31229	26	40	1.1	1.1	NUM
ajst-31229	26	41	×	×	NOUN
ajst-31229	26	42	10⁻⁵	10⁻⁵	NUM
ajst-31229	26	43	aqueous	aqueous	ADJ
ajst-31229	26	44	solubility	solubility	NOUN
ajst-31229	26	45	(	(	PUNCT
ajst-31229	26	46	mol	mol	PROPN
ajst-31229	26	47	/	/	SYM
ajst-31229	26	48	kg	kg	PROPN
ajst-31229	26	49	)	)	PUNCT
ajst-31229	26	50	7.9	7.9	NUM
ajst-31229	26	51	×	×	NOUN
ajst-31229	26	52	10⁻⁴	10⁻⁴	NUM
ajst-31229	26	53	1.4	1.4	NUM
ajst-31229	26	54	×	×	PROPN
ajst-31229	26	55	10⁻³	10⁻³	PROPN
ajst-31229	26	56	standard	standard	ADJ
ajst-31229	26	57	boiling	boiling	NOUN
ajst-31229	26	58	point	point	NOUN
ajst-31229	26	59	(	(	PUNCT
ajst-31229	26	60	°	°	ADP
ajst-31229	26	61	c	c	X
ajst-31229	26	62	)	)	PUNCT
ajst-31229	26	63	−253	−253	VERB
ajst-31229	26	64	−165	−165	NOUN
ajst-31229	26	65	critical	critical	ADJ
ajst-31229	26	66	pressure	pressure	NOUN
ajst-31229	26	67	(	(	PUNCT
ajst-31229	26	68	pa	pa	PROPN
ajst-31229	26	69	)	)	PUNCT
ajst-31229	26	70	1.30	1.30	NUM
ajst-31229	26	71	×	×	NOUN
ajst-31229	26	72	10⁶	10⁶	NUM
ajst-31229	26	73	4.63967	4.63967	NUM
ajst-31229	26	74	×	×	NOUN
ajst-31229	26	75	10⁶	10⁶	NUM
ajst-31229	26	76	critical	critical	ADJ
ajst-31229	26	77	temperature	temperature	NOUN
ajst-31229	26	78	(	(	PUNCT
ajst-31229	26	79	°	°	ADP
ajst-31229	26	80	c	c	NOUN
ajst-31229	26	81	)	)	PUNCT
ajst-31229	26	82	−239.95	−239.95	NOUN
ajst-31229	26	83	−82.3	−82.3	DET
ajst-31229	26	84	heating	heating	NOUN
ajst-31229	26	85	value	value	NOUN
ajst-31229	26	86	(	(	PUNCT
ajst-31229	26	87	kj	kj	PROPN
ajst-31229	26	88	/	/	SYM
ajst-31229	26	89	g	g	NOUN
ajst-31229	26	90	)	)	PUNCT
ajst-31229	26	91	120	120	NUM
ajst-31229	26	92	–	–	PUNCT
ajst-31229	26	93	142	142	NUM
ajst-31229	26	94	50.2	50.2	NUM
ajst-31229	26	95	–	–	PUNCT
ajst-31229	26	96	55.5	55.5	NUM
ajst-31229	26	97	diffusivity	diffusivity	NOUN
ajst-31229	26	98	in	in	ADP
ajst-31229	26	99	water	water	NOUN
ajst-31229	26	100	(	(	PUNCT
ajst-31229	26	101	m²/s	m²/s	ADJ
ajst-31229	26	102	,	,	PUNCT
ajst-31229	26	103	25	25	NUM
ajst-31229	26	104	°	°	NOUN
ajst-31229	26	105	c	c	NOUN
ajst-31229	26	106	)	)	PUNCT
ajst-31229	26	107	5.13	5.13	NUM
ajst-31229	26	108	×	×	NOUN
ajst-31229	26	109	10⁻⁹	10⁻⁹	NUM
ajst-31229	26	110	1.85	1.85	NUM
ajst-31229	26	111	×	×	NOUN
ajst-31229	26	112	10⁻⁹	10⁻⁹	NUM
ajst-31229	26	113	gravimetric	gravimetric	ADJ
ajst-31229	26	114	energy	energy	NOUN
ajst-31229	26	115	densities	density	NOUN
ajst-31229	26	116	differ	differ	VERB
ajst-31229	26	117	markedly	markedly	ADV
ajst-31229	26	118	:	:	PUNCT
ajst-31229	26	119	hydrogen	hydrogen	NOUN
ajst-31229	26	120	’s	’s	PART
ajst-31229	26	121	value	value	NOUN
ajst-31229	26	122	is	be	AUX
ajst-31229	26	123	roughly	roughly	ADV
ajst-31229	26	124	120	120	NUM
ajst-31229	26	125	mj	mj	PROPN
ajst-31229	26	126	/	/	SYM
ajst-31229	26	127	kg	kg	PROPN
ajst-31229	26	128	,	,	PUNCT
ajst-31229	26	129	compared	compare	VERB
ajst-31229	26	130	to	to	ADP
ajst-31229	26	131	methane	methane	NOUN
ajst-31229	26	132	’s	’s	PART
ajst-31229	26	133	50	50	NUM
ajst-31229	26	134	mj	mj	PROPN
ajst-31229	26	135	/	/	SYM
ajst-31229	26	136	kg	kg	PROPN
ajst-31229	26	137	,	,	PUNCT
ajst-31229	26	138	but	but	CCONJ
ajst-31229	26	139	volumetric	volumetric	ADJ
ajst-31229	26	140	energy	energy	NOUN
ajst-31229	26	141	density	density	NOUN
ajst-31229	26	142	for	for	ADP
ajst-31229	26	143	hydrogen	hydrogen	NOUN
ajst-31229	26	144	is	be	AUX
ajst-31229	26	145	significantly	significantly	ADV
ajst-31229	26	146	lower	low	ADJ
ajst-31229	26	147	than	than	ADP
ajst-31229	26	148	that	that	PRON
ajst-31229	26	149	of	of	ADP
ajst-31229	26	150	hydrocarbons	hydrocarbon	NOUN
ajst-31229	26	151	[	[	X
ajst-31229	26	152	10	10	NUM
ajst-31229	26	153	,	,	PUNCT
ajst-31229	26	154	11	11	NUM
ajst-31229	26	155	]	]	PUNCT
ajst-31229	26	156	.	.	PUNCT
ajst-31229	27	1	121	121	NUM
ajst-31229	27	2	2.2	2.2	NUM
ajst-31229	27	3	.	.	PUNCT
ajst-31229	28	1	environmentally	environmentally	ADV
ajst-31229	28	2	friendly	friendly	ADJ
ajst-31229	28	3	energy	energy	NOUN
ajst-31229	28	4	combustion	combustion	NOUN
ajst-31229	28	5	of	of	ADP
ajst-31229	28	6	hydrogen	hydrogen	NOUN
ajst-31229	28	7	produces	produce	VERB
ajst-31229	28	8	water	water	NOUN
ajst-31229	28	9	vapor	vapor	NOUN
ajst-31229	28	10	as	as	ADP
ajst-31229	28	11	the	the	DET
ajst-31229	28	12	primary	primary	ADJ
ajst-31229	28	13	byproduct	byproduct	NOUN
ajst-31229	28	14	,	,	PUNCT
ajst-31229	28	15	rendering	render	VERB
ajst-31229	28	16	it	it	PRON
ajst-31229	28	17	an	an	DET
ajst-31229	28	18	environmentally	environmentally	ADV
ajst-31229	28	19	friendly	friendly	ADJ
ajst-31229	28	20	energy	energy	NOUN
ajst-31229	28	21	vector	vector	NOUN
ajst-31229	28	22	with	with	ADP
ajst-31229	28	23	negligible	negligible	ADJ
ajst-31229	28	24	direct	direct	ADJ
ajst-31229	28	25	emissions	emission	NOUN
ajst-31229	28	26	of	of	ADP
ajst-31229	28	27	co₂	co₂	NOUN
ajst-31229	28	28	,	,	PUNCT
ajst-31229	28	29	so₂	so₂	PROPN
ajst-31229	28	30	,	,	PUNCT
ajst-31229	28	31	nox	nox	NOUN
ajst-31229	28	32	,	,	PUNCT
ajst-31229	28	33	or	or	CCONJ
ajst-31229	28	34	particulate	particulate	NOUN
ajst-31229	28	35	matter	matter	NOUN
ajst-31229	28	36	[	[	X
ajst-31229	28	37	12	12	NUM
ajst-31229	28	38	]	]	PUNCT
ajst-31229	28	39	.	.	PUNCT
ajst-31229	29	1	when	when	SCONJ
ajst-31229	29	2	produced	produce	VERB
ajst-31229	29	3	via	via	ADP
ajst-31229	29	4	renewable	renewable	ADJ
ajst-31229	29	5	pathways	pathway	NOUN
ajst-31229	29	6	—	—	PUNCT
ajst-31229	29	7	such	such	ADJ
ajst-31229	29	8	as	as	ADP
ajst-31229	29	9	electrolysis	electrolysis	NOUN
ajst-31229	29	10	using	use	VERB
ajst-31229	29	11	solar	solar	ADJ
ajst-31229	29	12	or	or	CCONJ
ajst-31229	29	13	wind	wind	NOUN
ajst-31229	29	14	power	power	NOUN
ajst-31229	29	15	—	—	PUNCT
ajst-31229	29	16	hydrogen	hydrogen	NOUN
ajst-31229	29	17	becomes	become	VERB
ajst-31229	29	18	a	a	DET
ajst-31229	29	19	truly	truly	ADV
ajst-31229	29	20	low	low	ADJ
ajst-31229	29	21	-	-	PUNCT
ajst-31229	29	22	carbon	carbon	NOUN
ajst-31229	29	23	fuel	fuel	NOUN
ajst-31229	29	24	[	[	X
ajst-31229	29	25	13	13	NUM
ajst-31229	29	26	]	]	PUNCT
ajst-31229	29	27	.	.	PUNCT
ajst-31229	30	1	however	however	ADV
ajst-31229	30	2	,	,	PUNCT
ajst-31229	30	3	if	if	SCONJ
ajst-31229	30	4	generated	generate	VERB
ajst-31229	30	5	from	from	ADP
ajst-31229	30	6	fossil	fossil	NOUN
ajst-31229	30	7	-	-	PUNCT
ajst-31229	30	8	based	base	VERB
ajst-31229	30	9	sources	source	NOUN
ajst-31229	30	10	without	without	ADP
ajst-31229	30	11	carbon	carbon	NOUN
ajst-31229	30	12	capture	capture	NOUN
ajst-31229	30	13	,	,	PUNCT
ajst-31229	30	14	hydrogen	hydrogen	NOUN
ajst-31229	30	15	production	production	NOUN
ajst-31229	30	16	can	can	AUX
ajst-31229	30	17	still	still	ADV
ajst-31229	30	18	lead	lead	VERB
ajst-31229	30	19	to	to	ADP
ajst-31229	30	20	significant	significant	ADJ
ajst-31229	30	21	greenhouse	greenhouse	NOUN
ajst-31229	30	22	gas	gas	NOUN
ajst-31229	30	23	emissions	emission	NOUN
ajst-31229	30	24	[	[	X
ajst-31229	30	25	14	14	NUM
ajst-31229	30	26	]	]	SYM
ajst-31229	30	27	.	.	PUNCT
ajst-31229	31	1	2.3	2.3	NUM
ajst-31229	31	2	.	.	PUNCT
ajst-31229	31	3	industrial	industrial	ADJ
ajst-31229	31	4	-	-	PUNCT
ajst-31229	31	5	scale	scale	NOUN
ajst-31229	31	6	cost	cost	NOUN
ajst-31229	31	7	analysis	analysis	NOUN
ajst-31229	31	8	of	of	ADP
ajst-31229	31	9	underground	underground	ADJ
ajst-31229	31	10	hydrogen	hydrogen	NOUN
ajst-31229	31	11	storage	storage	NOUN
ajst-31229	31	12	the	the	DET
ajst-31229	31	13	cost	cost	NOUN
ajst-31229	31	14	of	of	ADP
ajst-31229	31	15	hydrogen	hydrogen	NOUN
ajst-31229	31	16	storage	storage	NOUN
ajst-31229	31	17	is	be	AUX
ajst-31229	31	18	a	a	DET
ajst-31229	31	19	critical	critical	ADJ
ajst-31229	31	20	component	component	NOUN
ajst-31229	31	21	of	of	ADP
ajst-31229	31	22	the	the	DET
ajst-31229	31	23	overall	overall	ADJ
ajst-31229	31	24	hydrogen	hydrogen	NOUN
ajst-31229	31	25	supply	supply	NOUN
ajst-31229	31	26	chain	chain	NOUN
ajst-31229	31	27	.	.	PUNCT
ajst-31229	32	1	conventional	conventional	ADJ
ajst-31229	32	2	aboveground	aboveground	ADJ
ajst-31229	32	3	storage	storage	NOUN
ajst-31229	32	4	methods	method	NOUN
ajst-31229	32	5	—	—	PUNCT
ajst-31229	32	6	high	high	ADJ
ajst-31229	32	7	-	-	PUNCT
ajst-31229	32	8	pressure	pressure	NOUN
ajst-31229	32	9	tanks	tank	NOUN
ajst-31229	32	10	or	or	CCONJ
ajst-31229	32	11	cryogenic	cryogenic	NOUN
ajst-31229	32	12	vessels	vessel	NOUN
ajst-31229	32	13	—	—	PUNCT
ajst-31229	32	14	incur	incur	ADJ
ajst-31229	32	15	high	high	ADJ
ajst-31229	32	16	capital	capital	NOUN
ajst-31229	32	17	and	and	CCONJ
ajst-31229	32	18	operational	operational	ADJ
ajst-31229	32	19	expenses	expense	NOUN
ajst-31229	32	20	,	,	PUNCT
ajst-31229	32	21	as	as	ADV
ajst-31229	32	22	well	well	ADV
ajst-31229	32	23	as	as	ADP
ajst-31229	32	24	energy	energy	NOUN
ajst-31229	32	25	penalties	penalty	NOUN
ajst-31229	32	26	for	for	ADP
ajst-31229	32	27	compression	compression	NOUN
ajst-31229	32	28	and	and	CCONJ
ajst-31229	32	29	liquefaction	liquefaction	NOUN
ajst-31229	32	30	[	[	X
ajst-31229	32	31	15	15	NUM
ajst-31229	32	32	]	]	PUNCT
ajst-31229	32	33	.	.	PUNCT
ajst-31229	33	1	underground	underground	ADJ
ajst-31229	33	2	storage	storage	NOUN
ajst-31229	33	3	,	,	PUNCT
ajst-31229	33	4	by	by	ADP
ajst-31229	33	5	contrast	contrast	NOUN
ajst-31229	33	6	,	,	PUNCT
ajst-31229	33	7	offers	offer	VERB
ajst-31229	33	8	the	the	DET
ajst-31229	33	9	potential	potential	NOUN
ajst-31229	33	10	for	for	ADP
ajst-31229	33	11	lower	low	ADJ
ajst-31229	33	12	per	per	ADP
ajst-31229	33	13	-	-	PUNCT
ajst-31229	33	14	unit	unit	NOUN
ajst-31229	33	15	storage	storage	NOUN
ajst-31229	33	16	costs	cost	NOUN
ajst-31229	33	17	due	due	ADJ
ajst-31229	33	18	to	to	ADP
ajst-31229	33	19	large	large	ADJ
ajst-31229	33	20	-	-	PUNCT
ajst-31229	33	21	scale	scale	NOUN
ajst-31229	33	22	buffering	buffering	NOUN
ajst-31229	33	23	capacity	capacity	NOUN
ajst-31229	33	24	,	,	PUNCT
ajst-31229	33	25	reduced	reduce	VERB
ajst-31229	33	26	land	land	NOUN
ajst-31229	33	27	footprint	footprint	NOUN
ajst-31229	33	28	,	,	PUNCT
ajst-31229	33	29	and	and	CCONJ
ajst-31229	33	30	insulation	insulation	NOUN
ajst-31229	33	31	by	by	ADP
ajst-31229	33	32	the	the	DET
ajst-31229	33	33	subsurface	subsurface	NOUN
ajst-31229	33	34	environment	environment	NOUN
ajst-31229	33	35	,	,	PUNCT
ajst-31229	33	36	which	which	PRON
ajst-31229	33	37	mitigates	mitigate	VERB
ajst-31229	33	38	thermal	thermal	ADJ
ajst-31229	33	39	losses	loss	NOUN
ajst-31229	33	40	[	[	X
ajst-31229	33	41	16	16	NUM
ajst-31229	33	42	]	]	PUNCT
ajst-31229	33	43	.	.	PUNCT
ajst-31229	34	1	furthermore	furthermore	ADV
ajst-31229	34	2	,	,	PUNCT
ajst-31229	34	3	underground	underground	ADJ
ajst-31229	34	4	reservoirs	reservoir	NOUN
ajst-31229	34	5	can	can	AUX
ajst-31229	34	6	leverage	leverage	VERB
ajst-31229	34	7	existing	exist	VERB
ajst-31229	34	8	infrastructure	infrastructure	NOUN
ajst-31229	34	9	and	and	CCONJ
ajst-31229	34	10	geological	geological	ADJ
ajst-31229	34	11	containment	containment	NOUN
ajst-31229	34	12	to	to	PART
ajst-31229	34	13	provide	provide	VERB
ajst-31229	34	14	safer	safe	ADJ
ajst-31229	34	15	,	,	PUNCT
ajst-31229	34	16	large	large	ADJ
ajst-31229	34	17	-	-	PUNCT
ajst-31229	34	18	volume	volume	NOUN
ajst-31229	34	19	storage	storage	NOUN
ajst-31229	34	20	[	[	X
ajst-31229	34	21	17	17	NUM
ajst-31229	34	22	]	]	PUNCT
ajst-31229	34	23	.	.	PUNCT
ajst-31229	35	1	the	the	DET
ajst-31229	35	2	industrial	industrial	ADJ
ajst-31229	35	3	-	-	PUNCT
ajst-31229	35	4	scale	scale	NOUN
ajst-31229	35	5	application	application	NOUN
ajst-31229	35	6	of	of	ADP
ajst-31229	35	7	underground	underground	ADJ
ajst-31229	35	8	hydrogen	hydrogen	NOUN
ajst-31229	35	9	storage	storage	NOUN
ajst-31229	35	10	technology	technology	NOUN
ajst-31229	35	11	depends	depend	VERB
ajst-31229	35	12	not	not	PART
ajst-31229	35	13	only	only	ADV
ajst-31229	35	14	on	on	ADP
ajst-31229	35	15	the	the	DET
ajst-31229	35	16	cost	cost	NOUN
ajst-31229	35	17	of	of	ADP
ajst-31229	35	18	the	the	DET
ajst-31229	35	19	storage	storage	NOUN
ajst-31229	35	20	technology	technology	NOUN
ajst-31229	35	21	itself	itself	PRON
ajst-31229	35	22	,	,	PUNCT
ajst-31229	35	23	but	but	CCONJ
ajst-31229	35	24	more	more	ADV
ajst-31229	35	25	critically	critically	ADV
ajst-31229	35	26	on	on	ADP
ajst-31229	35	27	the	the	DET
ajst-31229	35	28	reduction	reduction	NOUN
ajst-31229	35	29	of	of	ADP
ajst-31229	35	30	electrolytic	electrolytic	ADJ
ajst-31229	35	31	hydrogen	hydrogen	NOUN
ajst-31229	35	32	production	production	NOUN
ajst-31229	35	33	costs	cost	NOUN
ajst-31229	35	34	.	.	PUNCT
ajst-31229	36	1	since	since	SCONJ
ajst-31229	36	2	electrolysis	electrolysis	NOUN
ajst-31229	36	3	accounts	account	NOUN
ajst-31229	36	4	for	for	ADP
ajst-31229	36	5	the	the	DET
ajst-31229	36	6	dominant	dominant	ADJ
ajst-31229	36	7	share	share	NOUN
ajst-31229	36	8	of	of	ADP
ajst-31229	36	9	costs	cost	NOUN
ajst-31229	36	10	in	in	ADP
ajst-31229	36	11	the	the	DET
ajst-31229	36	12	hydrogen	hydrogen	NOUN
ajst-31229	36	13	production	production	NOUN
ajst-31229	36	14	–	–	PUNCT
ajst-31229	36	15	storage	storage	NOUN
ajst-31229	36	16	value	value	NOUN
ajst-31229	36	17	chain	chain	NOUN
ajst-31229	36	18	,	,	PUNCT
ajst-31229	36	19	lowering	lower	VERB
ajst-31229	36	20	the	the	DET
ajst-31229	36	21	cost	cost	NOUN
ajst-31229	36	22	of	of	ADP
ajst-31229	36	23	hydrogen	hydrogen	NOUN
ajst-31229	36	24	production	production	NOUN
ajst-31229	36	25	via	via	ADP
ajst-31229	36	26	electrolysis	electrolysis	NOUN
ajst-31229	36	27	will	will	AUX
ajst-31229	36	28	be	be	AUX
ajst-31229	36	29	a	a	DET
ajst-31229	36	30	decisive	decisive	ADJ
ajst-31229	36	31	factor	factor	NOUN
ajst-31229	36	32	in	in	ADP
ajst-31229	36	33	enabling	enable	VERB
ajst-31229	36	34	large	large	ADJ
ajst-31229	36	35	-	-	PUNCT
ajst-31229	36	36	scale	scale	NOUN
ajst-31229	36	37	deployment	deployment	NOUN
ajst-31229	36	38	of	of	ADP
ajst-31229	36	39	underground	underground	ADJ
ajst-31229	36	40	hydrogen	hydrogen	NOUN
ajst-31229	36	41	storage	storage	NOUN
ajst-31229	36	42	.	.	PUNCT
ajst-31229	37	1	3	3	X
ajst-31229	37	2	.	.	X
ajst-31229	37	3	main	main	ADJ
ajst-31229	37	4	factors	factor	NOUN
ajst-31229	37	5	affecting	affect	VERB
ajst-31229	37	6	underground	underground	ADJ
ajst-31229	37	7	hydrogen	hydrogen	NOUN
ajst-31229	37	8	storage	storage	NOUN
ajst-31229	37	9	3.1	3.1	NUM
ajst-31229	37	10	.	.	PUNCT
ajst-31229	38	1	hydrogen	hydrogen	NOUN
ajst-31229	38	2	-	-	PUNCT
ajst-31229	38	3	brine	brine	NOUN
ajst-31229	38	4	-	-	PUNCT
ajst-31229	38	5	rock	rock	NOUN
ajst-31229	38	6	geochemical	geochemical	ADJ
ajst-31229	38	7	reactions	reaction	NOUN
ajst-31229	38	8	hydrogen	hydrogen	NOUN
ajst-31229	38	9	can	can	AUX
ajst-31229	38	10	participate	participate	VERB
ajst-31229	38	11	in	in	ADP
ajst-31229	38	12	geochemical	geochemical	ADJ
ajst-31229	38	13	reactions	reaction	NOUN
ajst-31229	38	14	within	within	ADP
ajst-31229	38	15	the	the	DET
ajst-31229	38	16	subsurface	subsurface	NOUN
ajst-31229	38	17	,	,	PUNCT
ajst-31229	38	18	such	such	ADJ
ajst-31229	38	19	as	as	ADP
ajst-31229	38	20	reacting	react	VERB
ajst-31229	38	21	with	with	ADP
ajst-31229	38	22	minerals	mineral	NOUN
ajst-31229	38	23	in	in	ADP
ajst-31229	38	24	reservoir	reservoir	NOUN
ajst-31229	38	25	rocks	rock	NOUN
ajst-31229	38	26	and	and	CCONJ
ajst-31229	38	27	with	with	ADP
ajst-31229	38	28	cement	cement	NOUN
ajst-31229	38	29	or	or	CCONJ
ajst-31229	38	30	steel	steel	NOUN
ajst-31229	38	31	well	well	NOUN
ajst-31229	38	32	casings	casing	NOUN
ajst-31229	38	33	,	,	PUNCT
ajst-31229	38	34	potentially	potentially	ADV
ajst-31229	38	35	forming	form	VERB
ajst-31229	38	36	unwanted	unwanted	ADJ
ajst-31229	38	37	compounds	compound	NOUN
ajst-31229	38	38	like	like	ADP
ajst-31229	38	39	water	water	NOUN
ajst-31229	38	40	or	or	CCONJ
ajst-31229	38	41	hydrogen	hydrogen	NOUN
ajst-31229	38	42	sulfide	sulfide	NOUN
ajst-31229	38	43	[	[	X
ajst-31229	38	44	18	18	NUM
ajst-31229	38	45	]	]	PUNCT
ajst-31229	38	46	.	.	PUNCT
ajst-31229	39	1	phyllosilicates	phyllosilicate	NOUN
ajst-31229	39	2	and	and	CCONJ
ajst-31229	39	3	iron	iron	NOUN
ajst-31229	39	4	-	-	PUNCT
ajst-31229	39	5	bearing	bear	VERB
ajst-31229	39	6	minerals	mineral	NOUN
ajst-31229	39	7	present	present	ADJ
ajst-31229	39	8	in	in	ADP
ajst-31229	39	9	porous	porous	ADJ
ajst-31229	39	10	sandstones	sandstone	NOUN
ajst-31229	39	11	can	can	AUX
ajst-31229	39	12	catalyze	catalyze	VERB
ajst-31229	39	13	hydrogen	hydrogen	NOUN
ajst-31229	39	14	oxidation	oxidation	NOUN
ajst-31229	39	15	,	,	PUNCT
ajst-31229	39	16	reducing	reduce	VERB
ajst-31229	39	17	the	the	DET
ajst-31229	39	18	storage	storage	NOUN
ajst-31229	39	19	efficiency	efficiency	NOUN
ajst-31229	39	20	[	[	X
ajst-31229	39	21	19	19	NUM
ajst-31229	39	22	]	]	PUNCT
ajst-31229	39	23	.	.	PUNCT
ajst-31229	40	1	additionally	additionally	ADV
ajst-31229	40	2	,	,	PUNCT
ajst-31229	40	3	hydrogen	hydrogen	NOUN
ajst-31229	40	4	’s	’s	PART
ajst-31229	40	5	small	small	ADJ
ajst-31229	40	6	molecular	molecular	ADJ
ajst-31229	40	7	size	size	NOUN
ajst-31229	40	8	facilitates	facilitate	VERB
ajst-31229	40	9	diffusion	diffusion	NOUN
ajst-31229	40	10	through	through	ADP
ajst-31229	40	11	microfractures	microfracture	NOUN
ajst-31229	40	12	,	,	PUNCT
ajst-31229	40	13	raising	raise	VERB
ajst-31229	40	14	the	the	DET
ajst-31229	40	15	risk	risk	NOUN
ajst-31229	40	16	of	of	ADP
ajst-31229	40	17	loss	loss	NOUN
ajst-31229	40	18	to	to	ADP
ajst-31229	40	19	overlying	overlie	VERB
ajst-31229	40	20	formations	formation	NOUN
ajst-31229	40	21	[	[	X
ajst-31229	40	22	20	20	NUM
ajst-31229	40	23	]	]	PUNCT
ajst-31229	40	24	.	.	PUNCT
ajst-31229	41	1	3.2	3.2	NUM
ajst-31229	41	2	.	.	PUNCT
ajst-31229	41	3	microbial	microbial	ADJ
ajst-31229	41	4	growth	growth	NOUN
ajst-31229	41	5	in	in	ADP
ajst-31229	41	6	the	the	DET
ajst-31229	41	7	reservoir	reservoir	NOUN
ajst-31229	41	8	microbial	microbial	ADJ
ajst-31229	41	9	activity	activity	NOUN
ajst-31229	41	10	in	in	ADP
ajst-31229	41	11	subsurface	subsurface	NOUN
ajst-31229	41	12	formations	formation	NOUN
ajst-31229	41	13	can	can	AUX
ajst-31229	41	14	lead	lead	VERB
ajst-31229	41	15	to	to	ADP
ajst-31229	41	16	hydrogen	hydrogen	NOUN
ajst-31229	41	17	consumption	consumption	NOUN
ajst-31229	41	18	.	.	PUNCT
ajst-31229	42	1	sulfate	sulfate	NOUN
ajst-31229	42	2	-	-	PUNCT
ajst-31229	42	3	reducing	reduce	VERB
ajst-31229	42	4	bacteria	bacteria	NOUN
ajst-31229	42	5	(	(	PUNCT
ajst-31229	42	6	srb	srb	PROPN
ajst-31229	42	7	)	)	PUNCT
ajst-31229	42	8	,	,	PUNCT
ajst-31229	42	9	for	for	ADP
ajst-31229	42	10	instance	instance	NOUN
ajst-31229	42	11	,	,	PUNCT
ajst-31229	42	12	utilize	utilize	VERB
ajst-31229	42	13	hydrogen	hydrogen	NOUN
ajst-31229	42	14	to	to	PART
ajst-31229	42	15	reduce	reduce	VERB
ajst-31229	42	16	sulfate	sulfate	NOUN
ajst-31229	42	17	to	to	ADP
ajst-31229	42	18	sulfide	sulfide	NOUN
ajst-31229	42	19	,	,	PUNCT
ajst-31229	42	20	producing	produce	VERB
ajst-31229	42	21	h₂s	h₂s	NOUN
ajst-31229	42	22	,	,	PUNCT
ajst-31229	42	23	which	which	PRON
ajst-31229	42	24	can	can	AUX
ajst-31229	42	25	corrode	corrode	VERB
ajst-31229	42	26	steel	steel	NOUN
ajst-31229	42	27	components	component	NOUN
ajst-31229	42	28	and	and	CCONJ
ajst-31229	42	29	pose	pose	VERB
ajst-31229	42	30	safety	safety	NOUN
ajst-31229	42	31	hazards	hazard	NOUN
ajst-31229	42	32	[	[	X
ajst-31229	42	33	21	21	NUM
ajst-31229	42	34	]	]	PUNCT
ajst-31229	42	35	.	.	PUNCT
ajst-31229	43	1	other	other	ADJ
ajst-31229	43	2	microbial	microbial	ADJ
ajst-31229	43	3	communities	community	NOUN
ajst-31229	43	4	,	,	PUNCT
ajst-31229	43	5	such	such	ADJ
ajst-31229	43	6	as	as	ADP
ajst-31229	43	7	methanogens	methanogen	NOUN
ajst-31229	43	8	,	,	PUNCT
ajst-31229	43	9	may	may	AUX
ajst-31229	43	10	convert	convert	VERB
ajst-31229	43	11	hydrogen	hydrogen	NOUN
ajst-31229	43	12	into	into	ADP
ajst-31229	43	13	methane	methane	NOUN
ajst-31229	43	14	via	via	ADP
ajst-31229	43	15	co₂	co₂	PROPN
ajst-31229	43	16	reduction	reduction	NOUN
ajst-31229	43	17	,	,	PUNCT
ajst-31229	43	18	altering	alter	VERB
ajst-31229	43	19	the	the	DET
ajst-31229	43	20	gas	gas	NOUN
ajst-31229	43	21	composition	composition	NOUN
ajst-31229	43	22	and	and	CCONJ
ajst-31229	43	23	reducing	reduce	VERB
ajst-31229	43	24	stored	store	VERB
ajst-31229	43	25	hydrogen	hydrogen	NOUN
ajst-31229	43	26	volume	volume	NOUN
ajst-31229	43	27	[	[	X
ajst-31229	43	28	22	22	NUM
ajst-31229	43	29	]	]	PUNCT
ajst-31229	43	30	.	.	PUNCT
ajst-31229	44	1	factors	factor	NOUN
ajst-31229	44	2	such	such	ADJ
ajst-31229	44	3	as	as	ADP
ajst-31229	44	4	temperature	temperature	NOUN
ajst-31229	44	5	,	,	PUNCT
ajst-31229	44	6	ph	ph	ADJ
ajst-31229	44	7	,	,	PUNCT
ajst-31229	44	8	nutrient	nutrient	NOUN
ajst-31229	44	9	availability	availability	NOUN
ajst-31229	44	10	,	,	PUNCT
ajst-31229	44	11	and	and	CCONJ
ajst-31229	44	12	the	the	DET
ajst-31229	44	13	presence	presence	NOUN
ajst-31229	44	14	of	of	ADP
ajst-31229	44	15	competing	compete	VERB
ajst-31229	44	16	electron	electron	NOUN
ajst-31229	44	17	acceptors	acceptor	NOUN
ajst-31229	44	18	influence	influence	VERB
ajst-31229	44	19	the	the	DET
ajst-31229	44	20	rate	rate	NOUN
ajst-31229	44	21	of	of	ADP
ajst-31229	44	22	microbial	microbial	ADJ
ajst-31229	44	23	consumption	consumption	NOUN
ajst-31229	44	24	[	[	X
ajst-31229	44	25	23	23	NUM
ajst-31229	44	26	]	]	PUNCT
ajst-31229	44	27	.	.	PUNCT
ajst-31229	45	1	3.3	3.3	NUM
ajst-31229	45	2	.	.	PUNCT
ajst-31229	46	1	geomechanical	geomechanical	ADJ
ajst-31229	46	2	considerations	consideration	NOUN
ajst-31229	46	3	for	for	ADP
ajst-31229	46	4	storage	storage	NOUN
ajst-31229	46	5	integrity	integrity	NOUN
ajst-31229	46	6	cyclical	cyclical	ADJ
ajst-31229	46	7	hydrogen	hydrogen	NOUN
ajst-31229	46	8	injection	injection	NOUN
ajst-31229	46	9	and	and	CCONJ
ajst-31229	46	10	reproduction	reproduction	NOUN
ajst-31229	46	11	leads	lead	VERB
ajst-31229	46	12	to	to	ADP
ajst-31229	46	13	cyclical	cyclical	ADJ
ajst-31229	46	14	pressure	pressure	NOUN
ajst-31229	46	15	changes	change	NOUN
ajst-31229	46	16	on	on	ADP
ajst-31229	46	17	intact	intact	ADJ
ajst-31229	46	18	and	and	CCONJ
ajst-31229	46	19	fault	fault	VERB
ajst-31229	46	20	rock	rock	NOUN
ajst-31229	46	21	behaviour	behaviour	NOUN
ajst-31229	46	22	,	,	PUNCT
ajst-31229	46	23	short	short	ADJ
ajst-31229	46	24	and	and	CCONJ
ajst-31229	46	25	long	long	ADJ
ajst-31229	46	26	-	-	PUNCT
ajst-31229	46	27	term	term	NOUN
ajst-31229	46	28	chemical	chemical	NOUN
ajst-31229	46	29	interaction	interaction	NOUN
ajst-31229	46	30	of	of	ADP
ajst-31229	46	31	hydrogen	hydrogen	NOUN
ajst-31229	46	32	on	on	ADP
ajst-31229	46	33	intact	intact	ADJ
ajst-31229	46	34	rock	rock	NOUN
ajst-31229	46	35	and	and	CCONJ
ajst-31229	46	36	faults	fault	NOUN
ajst-31229	46	37	,	,	PUNCT
ajst-31229	46	38	and	and	CCONJ
ajst-31229	46	39	stress	stress	NOUN
ajst-31229	46	40	–	–	PUNCT
ajst-31229	46	41	strain	strain	NOUN
ajst-31229	46	42	-	-	PUNCT
ajst-31229	46	43	sorption	sorption	NOUN
ajst-31229	46	44	on	on	ADP
ajst-31229	46	45	mechanical	mechanical	ADJ
ajst-31229	46	46	and	and	CCONJ
ajst-31229	46	47	transport	transport	NOUN
ajst-31229	46	48	behaviour	behaviour	NOUN
ajst-31229	46	49	,	,	PUNCT
ajst-31229	46	50	all	all	PRON
ajst-31229	46	51	of	of	ADP
ajst-31229	46	52	which	which	PRON
ajst-31229	46	53	can	can	AUX
ajst-31229	46	54	have	have	VERB
ajst-31229	46	55	crucial	crucial	ADJ
ajst-31229	46	56	impact	impact	NOUN
ajst-31229	46	57	on	on	ADP
ajst-31229	46	58	the	the	DET
ajst-31229	46	59	storage	storage	NOUN
ajst-31229	46	60	integrity	integrity	NOUN
ajst-31229	46	61	.	.	PUNCT
ajst-31229	47	1	maintaining	maintain	VERB
ajst-31229	47	2	reservoir	reservoir	NOUN
ajst-31229	47	3	and	and	CCONJ
ajst-31229	47	4	caprock	caprock	NOUN
ajst-31229	47	5	integrity	integrity	NOUN
ajst-31229	47	6	is	be	AUX
ajst-31229	47	7	paramount	paramount	ADJ
ajst-31229	47	8	to	to	PART
ajst-31229	47	9	prevent	prevent	VERB
ajst-31229	47	10	hydrogen	hydrogen	NOUN
ajst-31229	47	11	leakage	leakage	NOUN
ajst-31229	47	12	.	.	PUNCT
ajst-31229	48	1	caprocks	caprock	NOUN
ajst-31229	48	2	—	—	PUNCT
ajst-31229	48	3	typically	typically	ADV
ajst-31229	48	4	lowpermeability	lowpermeability	NOUN
ajst-31229	48	5	shales	shale	NOUN
ajst-31229	48	6	or	or	CCONJ
ajst-31229	48	7	evaporites	evaporite	NOUN
ajst-31229	48	8	—	—	PUNCT
ajst-31229	48	9	must	must	AUX
ajst-31229	48	10	exhibit	exhibit	VERB
ajst-31229	48	11	hydraulic	hydraulic	ADJ
ajst-31229	48	12	conductivities	conductivity	NOUN
ajst-31229	48	13	below	below	ADP
ajst-31229	48	14	10⁻⁸	10⁻⁸	NUM
ajst-31229	48	15	m	m	NOUN
ajst-31229	48	16	/	/	SYM
ajst-31229	48	17	s	s	VERB
ajst-31229	48	18	to	to	PART
ajst-31229	48	19	ensure	ensure	VERB
ajst-31229	48	20	containment	containment	NOUN
ajst-31229	49	1	[	[	X
ajst-31229	49	2	24	24	NUM
ajst-31229	49	3	]	]	PUNCT
ajst-31229	49	4	.	.	PUNCT
ajst-31229	50	1	faults	fault	NOUN
ajst-31229	50	2	,	,	PUNCT
ajst-31229	50	3	fractures	fracture	NOUN
ajst-31229	50	4	,	,	PUNCT
ajst-31229	50	5	or	or	CCONJ
ajst-31229	50	6	wellbore	wellbore	NOUN
ajst-31229	50	7	violations	violation	NOUN
ajst-31229	50	8	can	can	AUX
ajst-31229	50	9	compromise	compromise	VERB
ajst-31229	50	10	sealing	sealing	NOUN
ajst-31229	50	11	,	,	PUNCT
ajst-31229	50	12	necessitating	necessitate	VERB
ajst-31229	50	13	rigorous	rigorous	ADJ
ajst-31229	50	14	site	site	NOUN
ajst-31229	50	15	characterization	characterization	NOUN
ajst-31229	50	16	,	,	PUNCT
ajst-31229	50	17	monitoring	monitoring	NOUN
ajst-31229	50	18	,	,	PUNCT
ajst-31229	50	19	and	and	CCONJ
ajst-31229	50	20	remediation	remediation	NOUN
ajst-31229	50	21	strategies	strategy	NOUN
ajst-31229	50	22	[	[	X
ajst-31229	50	23	25	25	NUM
ajst-31229	50	24	]	]	PUNCT
ajst-31229	50	25	.	.	PUNCT
ajst-31229	51	1	steel	steel	NOUN
ajst-31229	51	2	materials	material	NOUN
ajst-31229	51	3	used	use	VERB
ajst-31229	51	4	in	in	ADP
ajst-31229	51	5	well	well	ADJ
ajst-31229	51	6	casings	casing	NOUN
ajst-31229	51	7	must	must	AUX
ajst-31229	51	8	withstand	withstand	VERB
ajst-31229	51	9	hydrogen	hydrogen	NOUN
ajst-31229	51	10	embrittlement	embrittlement	NOUN
ajst-31229	51	11	,	,	PUNCT
ajst-31229	51	12	which	which	PRON
ajst-31229	51	13	can	can	AUX
ajst-31229	51	14	cause	cause	VERB
ajst-31229	51	15	microcracks	microcrack	NOUN
ajst-31229	51	16	and	and	CCONJ
ajst-31229	51	17	structural	structural	ADJ
ajst-31229	51	18	failure	failure	NOUN
ajst-31229	51	19	.	.	PUNCT
ajst-31229	52	1	4	4	X
ajst-31229	52	2	.	.	X
ajst-31229	52	3	principles	principle	NOUN
ajst-31229	52	4	and	and	CCONJ
ajst-31229	52	5	types	type	NOUN
ajst-31229	52	6	of	of	ADP
ajst-31229	52	7	underground	underground	ADJ
ajst-31229	52	8	hydrogen	hydrogen	NOUN
ajst-31229	52	9	storage	storage	NOUN
ajst-31229	52	10	4.1	4.1	NUM
ajst-31229	52	11	.	.	PUNCT
ajst-31229	53	1	principles	principle	NOUN
ajst-31229	53	2	of	of	ADP
ajst-31229	53	3	underground	underground	ADJ
ajst-31229	53	4	hydrogen	hydrogen	NOUN
ajst-31229	53	5	storage	storage	NOUN
ajst-31229	53	6	as	as	SCONJ
ajst-31229	53	7	shown	show	VERB
ajst-31229	53	8	in	in	ADP
ajst-31229	53	9	figure	figure	NOUN
ajst-31229	53	10	1	1	NUM
ajst-31229	53	11	,	,	PUNCT
ajst-31229	53	12	underground	underground	ADJ
ajst-31229	53	13	hydrogen	hydrogen	NOUN
ajst-31229	53	14	storage	storage	NOUN
ajst-31229	53	15	(	(	PUNCT
ajst-31229	53	16	uhs	uhs	NOUN
ajst-31229	53	17	)	)	PUNCT
ajst-31229	53	18	entails	entail	VERB
ajst-31229	53	19	injecting	inject	VERB
ajst-31229	53	20	hydrogen	hydrogen	NOUN
ajst-31229	53	21	gas	gas	NOUN
ajst-31229	53	22	into	into	ADP
ajst-31229	53	23	a	a	DET
ajst-31229	53	24	subsurface	subsurface	NOUN
ajst-31229	53	25	formation	formation	NOUN
ajst-31229	53	26	under	under	ADP
ajst-31229	53	27	pressure	pressure	NOUN
ajst-31229	53	28	and	and	CCONJ
ajst-31229	53	29	withdrawing	withdraw	VERB
ajst-31229	53	30	it	it	PRON
ajst-31229	53	31	as	as	SCONJ
ajst-31229	53	32	needed	need	VERB
ajst-31229	53	33	.	.	PUNCT
ajst-31229	54	1	key	key	ADJ
ajst-31229	54	2	principles	principle	NOUN
ajst-31229	54	3	include	include	VERB
ajst-31229	54	4	ensuring	ensure	VERB
ajst-31229	54	5	that	that	SCONJ
ajst-31229	54	6	the	the	DET
ajst-31229	54	7	reservoir	reservoir	NOUN
ajst-31229	54	8	’s	’s	PART
ajst-31229	54	9	pore	pore	ADJ
ajst-31229	54	10	volume	volume	NOUN
ajst-31229	54	11	can	can	AUX
ajst-31229	54	12	accommodate	accommodate	VERB
ajst-31229	54	13	hydrogen	hydrogen	NOUN
ajst-31229	54	14	,	,	PUNCT
ajst-31229	54	15	maintaining	maintain	VERB
ajst-31229	54	16	differential	differential	ADJ
ajst-31229	54	17	pressure	pressure	NOUN
ajst-31229	54	18	between	between	ADP
ajst-31229	54	19	injection	injection	NOUN
ajst-31229	54	20	and	and	CCONJ
ajst-31229	54	21	overlying	overlie	VERB
ajst-31229	54	22	formations	formation	NOUN
ajst-31229	54	23	to	to	PART
ajst-31229	54	24	prevent	prevent	VERB
ajst-31229	54	25	upward	upward	ADJ
ajst-31229	54	26	migration	migration	NOUN
ajst-31229	54	27	,	,	PUNCT
ajst-31229	54	28	and	and	CCONJ
ajst-31229	54	29	preserving	preserve	VERB
ajst-31229	54	30	reservoir	reservoir	NOUN
ajst-31229	54	31	deliverability	deliverability	NOUN
ajst-31229	54	32	over	over	ADP
ajst-31229	54	33	cyclic	cyclic	ADJ
ajst-31229	54	34	injections	injection	NOUN
ajst-31229	54	35	.	.	PUNCT
ajst-31229	55	1	a	a	DET
ajst-31229	55	2	cushion	cushion	NOUN
ajst-31229	55	3	gas	gas	NOUN
ajst-31229	55	4	(	(	PUNCT
ajst-31229	55	5	often	often	ADV
ajst-31229	55	6	inert	inert	ADJ
ajst-31229	55	7	or	or	CCONJ
ajst-31229	55	8	noncommercial	noncommercial	ADJ
ajst-31229	55	9	)	)	PUNCT
ajst-31229	55	10	may	may	AUX
ajst-31229	55	11	be	be	AUX
ajst-31229	55	12	left	leave	VERB
ajst-31229	55	13	in	in	ADP
ajst-31229	55	14	place	place	NOUN
ajst-31229	55	15	to	to	PART
ajst-31229	55	16	maintain	maintain	VERB
ajst-31229	55	17	pressure	pressure	NOUN
ajst-31229	55	18	and	and	CCONJ
ajst-31229	55	19	avoid	avoid	VERB
ajst-31229	55	20	reservoir	reservoir	NOUN
ajst-31229	55	21	collapse	collapse	NOUN
ajst-31229	55	22	.	.	PUNCT
ajst-31229	56	1	figure	figure	NOUN
ajst-31229	56	2	1	1	NUM
ajst-31229	56	3	.	.	PUNCT
ajst-31229	56	4	basic	basic	ADJ
ajst-31229	56	5	principle	principle	NOUN
ajst-31229	56	6	of	of	ADP
ajst-31229	56	7	uhs	uhs	PROPN
ajst-31229	56	8	4.2	4.2	NUM
ajst-31229	56	9	.	.	PUNCT
ajst-31229	57	1	geological	geological	ADJ
ajst-31229	57	2	feature	feature	NOUN
ajst-31229	57	3	requirements	requirement	NOUN
ajst-31229	57	4	as	as	SCONJ
ajst-31229	57	5	shown	show	VERB
ajst-31229	57	6	in	in	ADP
ajst-31229	57	7	table2	table2	PROPN
ajst-31229	57	8	,	,	PUNCT
ajst-31229	57	9	salt	salt	NOUN
ajst-31229	57	10	caverns	cavern	NOUN
ajst-31229	57	11	—	—	PUNCT
ajst-31229	57	12	created	create	VERB
ajst-31229	57	13	by	by	ADP
ajst-31229	57	14	solution	solution	NOUN
ajst-31229	57	15	mining	mining	NOUN
ajst-31229	57	16	of	of	ADP
ajst-31229	57	17	halite	halite	ADJ
ajst-31229	57	18	deposits	deposit	NOUN
ajst-31229	57	19	—	—	PUNCT
ajst-31229	57	20	are	be	AUX
ajst-31229	57	21	widely	widely	ADV
ajst-31229	57	22	regarded	regard	VERB
ajst-31229	57	23	as	as	ADP
ajst-31229	57	24	the	the	DET
ajst-31229	57	25	most	most	ADV
ajst-31229	57	26	suitable	suitable	ADJ
ajst-31229	57	27	geological	geological	ADJ
ajst-31229	57	28	formation	formation	NOUN
ajst-31229	57	29	for	for	ADP
ajst-31229	57	30	hydrogen	hydrogen	NOUN
ajst-31229	57	31	storage	storage	NOUN
ajst-31229	57	32	due	due	ADP
ajst-31229	57	33	to	to	ADP
ajst-31229	57	34	their	their	PRON
ajst-31229	57	35	nearly	nearly	ADV
ajst-31229	57	36	impermeable	impermeable	ADJ
ajst-31229	57	37	nature	nature	NOUN
ajst-31229	57	38	,	,	PUNCT
ajst-31229	57	39	absence	absence	NOUN
ajst-31229	57	40	of	of	ADP
ajst-31229	57	41	microbial	microbial	ADJ
ajst-31229	57	42	activity	activity	NOUN
ajst-31229	57	43	,	,	PUNCT
ajst-31229	57	44	and	and	CCONJ
ajst-31229	57	45	ability	ability	NOUN
ajst-31229	57	46	to	to	PART
ajst-31229	57	47	self	self	NOUN
ajst-31229	57	48	-	-	PUNCT
ajst-31229	57	49	heal	heal	NOUN
ajst-31229	57	50	minor	minor	ADJ
ajst-31229	57	51	fractures	fracture	NOUN
ajst-31229	57	52	.	.	PUNCT
ajst-31229	58	1	aquifer	aquifer	NOUN
ajst-31229	58	2	storage	storage	NOUN
ajst-31229	58	3	leverages	leverage	NOUN
ajst-31229	58	4	porous	porous	ADJ
ajst-31229	58	5	,	,	PUNCT
ajst-31229	58	6	water	water	NOUN
ajst-31229	58	7	-	-	PUNCT
ajst-31229	58	8	saturated	saturate	VERB
ajst-31229	58	9	sandstone	sandstone	NOUN
ajst-31229	58	10	formations	formation	NOUN
ajst-31229	58	11	with	with	ADP
ajst-31229	58	12	122	122	NUM
ajst-31229	58	13	an	an	DET
ajst-31229	58	14	impermeable	impermeable	ADJ
ajst-31229	58	15	caprock	caprock	NOUN
ajst-31229	58	16	;	;	PUNCT
ajst-31229	58	17	however	however	ADV
ajst-31229	58	18	,	,	PUNCT
ajst-31229	58	19	it	it	PRON
ajst-31229	58	20	often	often	ADV
ajst-31229	58	21	requires	require	VERB
ajst-31229	58	22	maintaining	maintain	VERB
ajst-31229	58	23	a	a	DET
ajst-31229	58	24	cushion	cushion	NOUN
ajst-31229	58	25	gas	gas	NOUN
ajst-31229	58	26	and	and	CCONJ
ajst-31229	58	27	presents	present	VERB
ajst-31229	58	28	greater	great	ADJ
ajst-31229	58	29	risks	risk	NOUN
ajst-31229	58	30	of	of	ADP
ajst-31229	58	31	geochemical	geochemical	ADJ
ajst-31229	58	32	dilution	dilution	NOUN
ajst-31229	58	33	due	due	ADP
ajst-31229	58	34	to	to	ADP
ajst-31229	58	35	brine	brine	NOUN
ajst-31229	58	36	interactions	interaction	NOUN
ajst-31229	58	37	.	.	PUNCT
ajst-31229	59	1	depleted	depleted	ADJ
ajst-31229	59	2	gas	gas	NOUN
ajst-31229	59	3	reservoirs	reservoir	NOUN
ajst-31229	59	4	offer	offer	VERB
ajst-31229	59	5	the	the	DET
ajst-31229	59	6	advantage	advantage	NOUN
ajst-31229	59	7	of	of	ADP
ajst-31229	59	8	existing	exist	VERB
ajst-31229	59	9	infrastructure	infrastructure	NOUN
ajst-31229	59	10	—	—	PUNCT
ajst-31229	59	11	wells	well	NOUN
ajst-31229	59	12	,	,	PUNCT
ajst-31229	59	13	pipelines	pipeline	NOUN
ajst-31229	59	14	,	,	PUNCT
ajst-31229	59	15	and	and	CCONJ
ajst-31229	59	16	compression	compression	NOUN
ajst-31229	59	17	facilities	facility	NOUN
ajst-31229	59	18	—	—	PUNCT
ajst-31229	59	19	and	and	CCONJ
ajst-31229	59	20	proven	prove	VERB
ajst-31229	59	21	containment	containment	NOUN
ajst-31229	59	22	history	history	NOUN
ajst-31229	59	23	,	,	PUNCT
ajst-31229	59	24	but	but	CCONJ
ajst-31229	59	25	challenges	challenge	NOUN
ajst-31229	59	26	include	include	VERB
ajst-31229	59	27	residual	residual	ADJ
ajst-31229	59	28	hydrocarbon	hydrocarbon	NOUN
ajst-31229	59	29	presence	presence	NOUN
ajst-31229	59	30	,	,	PUNCT
ajst-31229	59	31	potential	potential	ADJ
ajst-31229	59	32	reactivity	reactivity	NOUN
ajst-31229	59	33	,	,	PUNCT
ajst-31229	59	34	and	and	CCONJ
ajst-31229	59	35	the	the	DET
ajst-31229	59	36	need	need	NOUN
ajst-31229	59	37	to	to	PART
ajst-31229	59	38	assess	assess	VERB
ajst-31229	59	39	caprock	caprock	NOUN
ajst-31229	59	40	integrity	integrity	NOUN
ajst-31229	59	41	.	.	PUNCT
ajst-31229	60	1	table	table	NOUN
ajst-31229	60	2	2	2	NUM
ajst-31229	60	3	.	.	NOUN
ajst-31229	60	4	three	three	NUM
ajst-31229	60	5	types	type	NOUN
ajst-31229	60	6	of	of	ADP
ajst-31229	60	7	underground	underground	ADJ
ajst-31229	60	8	hydrogen	hydrogen	NOUN
ajst-31229	60	9	storage	storage	NOUN
ajst-31229	60	10	reservoirs	reservoir	NOUN
ajst-31229	60	11	type	type	VERB
ajst-31229	60	12	geological	geological	ADJ
ajst-31229	60	13	setting	setting	NOUN
ajst-31229	60	14	depth	depth	NOUN
ajst-31229	60	15	(	(	PUNCT
ajst-31229	60	16	m	m	NOUN
ajst-31229	60	17	)	)	PUNCT
ajst-31229	60	18	operating	operate	VERB
ajst-31229	60	19	pressure	pressure	NOUN
ajst-31229	60	20	(	(	PUNCT
ajst-31229	60	21	bar	bar	NOUN
ajst-31229	60	22	)	)	PUNCT
ajst-31229	60	23	storage	storage	NOUN
ajst-31229	60	24	capacity	capacity	NOUN
ajst-31229	60	25	working	work	VERB
ajst-31229	60	26	gas	gas	NOUN
ajst-31229	60	27	ratio	ratio	NOUN
ajst-31229	60	28	(	(	PUNCT
ajst-31229	60	29	%	%	INTJ
ajst-31229	60	30	)	)	PUNCT
ajst-31229	60	31	injection	injection	NOUN
ajst-31229	60	32	–	–	PUNCT
ajst-31229	60	33	withdrawal	withdrawal	NOUN
ajst-31229	60	34	frequency	frequency	NOUN
ajst-31229	60	35	typical	typical	ADJ
ajst-31229	60	36	operational	operational	ADJ
ajst-31229	60	37	mode	mode	NOUN
ajst-31229	60	38	salt	salt	NOUN
ajst-31229	60	39	caverns	cavern	NOUN
ajst-31229	60	40	salt	salt	NOUN
ajst-31229	60	41	-	-	PUNCT
ajst-31229	60	42	bearing	bear	VERB
ajst-31229	60	43	sedimentary	sedimentary	ADJ
ajst-31229	60	44	basins	basin	NOUN
ajst-31229	60	45	300–1800	300–1800	NUM
ajst-31229	60	46	30–210	30–210	NUM
ajst-31229	60	47	large	large	ADJ
ajst-31229	60	48	;	;	PUNCT
ajst-31229	60	49	proportional	proportional	ADJ
ajst-31229	60	50	to	to	PART
ajst-31229	60	51	cavern	cavern	VERB
ajst-31229	60	52	volume	volume	NOUN
ajst-31229	60	53	>	>	X
ajst-31229	60	54	70	70	NUM
ajst-31229	60	55	up	up	ADP
ajst-31229	60	56	to	to	PART
ajst-31229	60	57	10	10	NUM
ajst-31229	60	58	cycles	cycle	NOUN
ajst-31229	60	59	per	per	ADP
ajst-31229	60	60	year	year	NOUN
ajst-31229	60	61	suitable	suitable	ADJ
ajst-31229	60	62	for	for	ADP
ajst-31229	60	63	highfrequency	highfrequency	NOUN
ajst-31229	60	64	seasonal	seasonal	ADJ
ajst-31229	60	65	storage	storage	NOUN
ajst-31229	60	66	depleted	deplete	VERB
ajst-31229	60	67	gas	gas	NOUN
ajst-31229	60	68	reservoirs	reservoir	NOUN
ajst-31229	60	69	hydrocarbonbearing	hydrocarbonbeare	VERB
ajst-31229	60	70	sedimentary	sedimentary	ADJ
ajst-31229	60	71	basins	basin	NOUN
ajst-31229	60	72	300–2700	300–2700	NUM
ajst-31229	60	73	15–285	15–285	NUM
ajst-31229	60	74	large	large	NOUN
ajst-31229	60	75	to	to	ADP
ajst-31229	60	76	very	very	ADV
ajst-31229	60	77	large	large	ADJ
ajst-31229	60	78	;	;	PUNCT
ajst-31229	60	79	similar	similar	ADJ
ajst-31229	60	80	to	to	ADP
ajst-31229	60	81	natural	natural	ADJ
ajst-31229	60	82	gas	gas	NOUN
ajst-31229	60	83	reserves	reserve	NOUN
ajst-31229	60	84	5–60	5–60	PROPN
ajst-31229	60	85	1–2	1–2	NUM
ajst-31229	60	86	cycles	cycle	NOUN
ajst-31229	60	87	per	per	ADP
ajst-31229	60	88	year	year	NOUN
ajst-31229	60	89	seasonal	seasonal	ADJ
ajst-31229	60	90	storage	storage	NOUN
ajst-31229	60	91	aquifers	aquifer	NOUN
ajst-31229	60	92	all	all	DET
ajst-31229	60	93	sedimentary	sedimentary	ADJ
ajst-31229	60	94	basins	basin	NOUN
ajst-31229	60	95	400–2300	400–2300	NUM
ajst-31229	61	1	30–315	30–315	NUM
ajst-31229	61	2	very	very	ADV
ajst-31229	61	3	large	large	ADJ
ajst-31229	61	4	20–50	20–50	NUM
ajst-31229	61	5	1–2	1–2	NUM
ajst-31229	61	6	cycles	cycle	NOUN
ajst-31229	61	7	per	per	ADP
ajst-31229	61	8	year	year	NOUN
ajst-31229	61	9	seasonal	seasonal	ADJ
ajst-31229	61	10	storage	storage	NOUN
ajst-31229	61	11	with	with	ADP
ajst-31229	61	12	potential	potential	ADJ
ajst-31229	61	13	gas	gas	NOUN
ajst-31229	61	14	losses	loss	NOUN
ajst-31229	61	15	4.3	4.3	NUM
ajst-31229	61	16	.	.	PUNCT
ajst-31229	62	1	domestic	domestic	ADJ
ajst-31229	62	2	and	and	CCONJ
ajst-31229	62	3	international	international	ADJ
ajst-31229	62	4	project	project	NOUN
ajst-31229	62	5	examples	example	NOUN
ajst-31229	63	1	;	;	PUNCT
ajst-31229	63	2	current	current	ADJ
ajst-31229	63	3	research	research	NOUN
ajst-31229	63	4	status	status	NOUN
ajst-31229	63	5	currently	currently	ADV
ajst-31229	63	6	,	,	PUNCT
ajst-31229	63	7	four	four	NUM
ajst-31229	63	8	pure	pure	ADJ
ajst-31229	63	9	hydrogen	hydrogen	NOUN
ajst-31229	63	10	storage	storage	NOUN
ajst-31229	63	11	facilities	facility	NOUN
ajst-31229	63	12	in	in	ADP
ajst-31229	63	13	salt	salt	NOUN
ajst-31229	63	14	caverns	cavern	NOUN
ajst-31229	63	15	are	be	AUX
ajst-31229	63	16	in	in	ADP
ajst-31229	63	17	operation	operation	NOUN
ajst-31229	63	18	worldwide	worldwide	ADV
ajst-31229	63	19	.	.	PUNCT
ajst-31229	64	1	in	in	ADP
ajst-31229	64	2	texas	texas	PROPN
ajst-31229	64	3	,	,	PUNCT
ajst-31229	64	4	usa	usa	PROPN
ajst-31229	64	5	,	,	PUNCT
ajst-31229	64	6	three	three	NUM
ajst-31229	64	7	independent	independent	ADJ
ajst-31229	64	8	salt	salt	NOUN
ajst-31229	64	9	cavern	cavern	NOUN
ajst-31229	64	10	hydrogen	hydrogen	NOUN
ajst-31229	64	11	storage	storage	NOUN
ajst-31229	64	12	sites	site	NOUN
ajst-31229	64	13	serve	serve	VERB
ajst-31229	64	14	the	the	DET
ajst-31229	64	15	petrochemical	petrochemical	NOUN
ajst-31229	64	16	industry	industry	NOUN
ajst-31229	64	17	.	.	PUNCT
ajst-31229	65	1	in	in	ADP
ajst-31229	65	2	europe	europe	PROPN
ajst-31229	65	3	,	,	PUNCT
ajst-31229	65	4	the	the	DET
ajst-31229	65	5	only	only	ADJ
ajst-31229	65	6	existing	exist	VERB
ajst-31229	65	7	salt	salt	NOUN
ajst-31229	65	8	cavern	cavern	NOUN
ajst-31229	65	9	hydrogen	hydrogen	NOUN
ajst-31229	65	10	storage	storage	NOUN
ajst-31229	65	11	facility	facility	NOUN
ajst-31229	65	12	is	be	AUX
ajst-31229	65	13	located	locate	VERB
ajst-31229	65	14	in	in	ADP
ajst-31229	65	15	teesside	teesside	NOUN
ajst-31229	65	16	,	,	PUNCT
ajst-31229	65	17	united	united	ADJ
ajst-31229	65	18	kingdom	kingdom	NOUN
ajst-31229	65	19	.	.	PUNCT
ajst-31229	66	1	it	it	PRON
ajst-31229	66	2	consists	consist	VERB
ajst-31229	66	3	of	of	ADP
ajst-31229	66	4	three	three	NUM
ajst-31229	66	5	caverns	cavern	NOUN
ajst-31229	66	6	with	with	ADP
ajst-31229	66	7	a	a	DET
ajst-31229	66	8	total	total	ADJ
ajst-31229	66	9	capacity	capacity	NOUN
ajst-31229	66	10	exceeding	exceed	VERB
ajst-31229	66	11	20,000	20,000	NUM
ajst-31229	66	12	m³.	m³.	NOUN
ajst-31229	66	13	this	this	DET
ajst-31229	66	14	facility	facility	NOUN
ajst-31229	66	15	has	have	AUX
ajst-31229	66	16	been	be	AUX
ajst-31229	66	17	operating	operate	VERB
ajst-31229	66	18	for	for	ADP
ajst-31229	66	19	over	over	ADP
ajst-31229	66	20	50	50	NUM
ajst-31229	66	21	years	year	NOUN
ajst-31229	66	22	,	,	PUNCT
ajst-31229	66	23	primarily	primarily	ADV
ajst-31229	66	24	supplying	supply	VERB
ajst-31229	66	25	hydrogen	hydrogen	NOUN
ajst-31229	66	26	for	for	ADP
ajst-31229	66	27	ammonia	ammonia	NOUN
ajst-31229	66	28	and	and	CCONJ
ajst-31229	66	29	methanol	methanol	NOUN
ajst-31229	66	30	production	production	NOUN
ajst-31229	66	31	.	.	PUNCT
ajst-31229	67	1	in	in	ADP
ajst-31229	67	2	china	china	PROPN
ajst-31229	67	3	,	,	PUNCT
ajst-31229	67	4	research	research	NOUN
ajst-31229	67	5	at	at	ADP
ajst-31229	67	6	the	the	DET
ajst-31229	67	7	sheng	sheng	PROPN
ajst-31229	67	8	li	li	PROPN
ajst-31229	67	9	oilfield	oilfield	PROPN
ajst-31229	67	10	has	have	AUX
ajst-31229	67	11	demonstrated	demonstrate	VERB
ajst-31229	67	12	successful	successful	ADJ
ajst-31229	67	13	cyclic	cyclic	ADJ
ajst-31229	67	14	hydrogen	hydrogen	NOUN
ajst-31229	67	15	injection	injection	NOUN
ajst-31229	67	16	and	and	CCONJ
ajst-31229	67	17	withdrawal	withdrawal	NOUN
ajst-31229	67	18	in	in	ADP
ajst-31229	67	19	a	a	DET
ajst-31229	67	20	depleted	deplete	VERB
ajst-31229	67	21	gas	gas	NOUN
ajst-31229	67	22	reservoir	reservoir	NOUN
ajst-31229	67	23	,	,	PUNCT
ajst-31229	67	24	examining	examine	VERB
ajst-31229	67	25	reservoir	reservoir	NOUN
ajst-31229	67	26	performance	performance	NOUN
ajst-31229	67	27	,	,	PUNCT
ajst-31229	67	28	geochemical	geochemical	ADJ
ajst-31229	67	29	interactions	interaction	NOUN
ajst-31229	67	30	,	,	PUNCT
ajst-31229	67	31	and	and	CCONJ
ajst-31229	67	32	caprock	caprock	NOUN
ajst-31229	67	33	sealing	sealing	NOUN
ajst-31229	67	34	.	.	PUNCT
ajst-31229	68	1	academic	academic	ADJ
ajst-31229	68	2	institutions	institution	NOUN
ajst-31229	68	3	such	such	ADJ
ajst-31229	68	4	as	as	ADP
ajst-31229	68	5	the	the	DET
ajst-31229	68	6	china	china	PROPN
ajst-31229	68	7	university	university	PROPN
ajst-31229	68	8	of	of	ADP
ajst-31229	68	9	petroleum	petroleum	NOUN
ajst-31229	68	10	have	have	AUX
ajst-31229	68	11	conducted	conduct	VERB
ajst-31229	68	12	laboratory	laboratory	NOUN
ajst-31229	68	13	-	-	PUNCT
ajst-31229	68	14	scale	scale	NOUN
ajst-31229	68	15	experiments	experiment	NOUN
ajst-31229	68	16	to	to	PART
ajst-31229	68	17	evaluate	evaluate	VERB
ajst-31229	68	18	hydrogen	hydrogen	NOUN
ajst-31229	68	19	’s	’s	PART
ajst-31229	68	20	interaction	interaction	NOUN
ajst-31229	68	21	with	with	ADP
ajst-31229	68	22	sandstone	sandstone	NOUN
ajst-31229	68	23	cores	core	NOUN
ajst-31229	68	24	under	under	ADP
ajst-31229	68	25	simulated	simulated	ADJ
ajst-31229	68	26	reservoir	reservoir	NOUN
ajst-31229	68	27	conditions	condition	NOUN
ajst-31229	68	28	.	.	PUNCT
ajst-31229	69	1	5	5	X
ajst-31229	69	2	.	.	NUM
ajst-31229	69	3	depleted	deplete	VERB
ajst-31229	69	4	oil	oil	NOUN
ajst-31229	69	5	and	and	CCONJ
ajst-31229	69	6	gas	gas	NOUN
ajst-31229	69	7	reservoir	reservoir	NOUN
ajst-31229	69	8	hydrogen	hydrogen	NOUN
ajst-31229	69	9	storage	storage	NOUN
ajst-31229	69	10	technology	technology	NOUN
ajst-31229	69	11	status	status	NOUN
ajst-31229	69	12	5.1	5.1	NUM
ajst-31229	69	13	.	.	PUNCT
ajst-31229	70	1	key	key	ADJ
ajst-31229	70	2	challenges	challenge	NOUN
ajst-31229	70	3	:	:	PUNCT
ajst-31229	70	4	flow	flow	NOUN
ajst-31229	70	5	leakage	leakage	NOUN
ajst-31229	70	6	,	,	PUNCT
ajst-31229	70	7	caprock	caprock	NOUN
ajst-31229	70	8	and	and	CCONJ
ajst-31229	70	9	facility	facility	NOUN
ajst-31229	70	10	integrity	integrity	NOUN
ajst-31229	70	11	failure	failure	NOUN
ajst-31229	70	12	,	,	PUNCT
ajst-31229	70	13	sulfide	sulfide	NOUN
ajst-31229	70	14	reaction	reaction	NOUN
ajst-31229	70	15	consuming	consume	VERB
ajst-31229	70	16	hydrogen	hydrogen	NOUN
ajst-31229	70	17	depleted	deplete	VERB
ajst-31229	70	18	oil	oil	NOUN
ajst-31229	70	19	and	and	CCONJ
ajst-31229	70	20	gas	gas	NOUN
ajst-31229	70	21	reservoirs	reservoir	NOUN
ajst-31229	70	22	present	present	VERB
ajst-31229	70	23	several	several	ADJ
ajst-31229	70	24	technical	technical	ADJ
ajst-31229	70	25	challenges	challenge	NOUN
ajst-31229	70	26	when	when	SCONJ
ajst-31229	70	27	repurposed	repurpose	VERB
ajst-31229	70	28	for	for	ADP
ajst-31229	70	29	hydrogen	hydrogen	NOUN
ajst-31229	70	30	storage	storage	NOUN
ajst-31229	70	31	.	.	PUNCT
ajst-31229	71	1	hydrogen	hydrogen	NOUN
ajst-31229	71	2	’s	’s	PART
ajst-31229	71	3	small	small	ADJ
ajst-31229	71	4	molecular	molecular	ADJ
ajst-31229	71	5	size	size	NOUN
ajst-31229	71	6	and	and	CCONJ
ajst-31229	71	7	high	high	ADJ
ajst-31229	71	8	diffusivity	diffusivity	NOUN
ajst-31229	71	9	raise	raise	VERB
ajst-31229	71	10	the	the	DET
ajst-31229	71	11	likelihood	likelihood	NOUN
ajst-31229	71	12	of	of	ADP
ajst-31229	71	13	migration	migration	NOUN
ajst-31229	71	14	through	through	ADP
ajst-31229	71	15	microfractures	microfracture	NOUN
ajst-31229	71	16	or	or	CCONJ
ajst-31229	71	17	existing	exist	VERB
ajst-31229	71	18	natural	natural	ADJ
ajst-31229	71	19	fractures	fracture	NOUN
ajst-31229	71	20	,	,	PUNCT
ajst-31229	71	21	leading	lead	VERB
ajst-31229	71	22	to	to	ADP
ajst-31229	71	23	potential	potential	ADJ
ajst-31229	71	24	flow	flow	NOUN
ajst-31229	71	25	leakage	leakage	NOUN
ajst-31229	71	26	.	.	PUNCT
ajst-31229	72	1	caprock	caprock	NOUN
ajst-31229	72	2	sealing	sealing	NOUN
ajst-31229	72	3	,	,	PUNCT
ajst-31229	72	4	which	which	PRON
ajst-31229	72	5	effectively	effectively	ADV
ajst-31229	72	6	contained	contain	VERB
ajst-31229	72	7	methane	methane	NOUN
ajst-31229	72	8	for	for	ADP
ajst-31229	72	9	millions	million	NOUN
ajst-31229	72	10	of	of	ADP
ajst-31229	72	11	years	year	NOUN
ajst-31229	72	12	,	,	PUNCT
ajst-31229	72	13	may	may	AUX
ajst-31229	72	14	behave	behave	VERB
ajst-31229	72	15	differently	differently	ADV
ajst-31229	72	16	with	with	ADP
ajst-31229	72	17	hydrogen	hydrogen	NOUN
ajst-31229	72	18	due	due	ADP
ajst-31229	72	19	to	to	ADP
ajst-31229	72	20	distinct	distinct	ADJ
ajst-31229	72	21	fluid	fluid	ADJ
ajst-31229	72	22	properties	property	NOUN
ajst-31229	72	23	and	and	CCONJ
ajst-31229	72	24	pressure	pressure	NOUN
ajst-31229	72	25	regimes	regime	NOUN
ajst-31229	72	26	.	.	PUNCT
ajst-31229	73	1	wellbore	wellbore	NOUN
ajst-31229	73	2	integrity	integrity	NOUN
ajst-31229	73	3	is	be	AUX
ajst-31229	73	4	another	another	DET
ajst-31229	73	5	concern	concern	NOUN
ajst-31229	73	6	:	:	PUNCT
ajst-31229	73	7	legacy	legacy	NOUN
ajst-31229	73	8	casing	casing	NOUN
ajst-31229	73	9	and	and	CCONJ
ajst-31229	73	10	cement	cement	NOUN
ajst-31229	73	11	may	may	AUX
ajst-31229	73	12	not	not	PART
ajst-31229	73	13	be	be	AUX
ajst-31229	73	14	designed	design	VERB
ajst-31229	73	15	to	to	PART
ajst-31229	73	16	withstand	withstand	VERB
ajst-31229	73	17	hydrogen	hydrogen	NOUN
ajst-31229	73	18	embrittlement	embrittlement	NOUN
ajst-31229	73	19	,	,	PUNCT
ajst-31229	73	20	which	which	PRON
ajst-31229	73	21	can	can	AUX
ajst-31229	73	22	induce	induce	VERB
ajst-31229	73	23	microcracks	microcrack	NOUN
ajst-31229	73	24	and	and	CCONJ
ajst-31229	73	25	compromise	compromise	VERB
ajst-31229	73	26	structural	structural	ADJ
ajst-31229	73	27	strength	strength	NOUN
ajst-31229	73	28	.	.	PUNCT
ajst-31229	74	1	additionally	additionally	ADV
ajst-31229	74	2	,	,	PUNCT
ajst-31229	74	3	residual	residual	ADJ
ajst-31229	74	4	hydrocarbons	hydrocarbon	NOUN
ajst-31229	74	5	and	and	CCONJ
ajst-31229	74	6	sulfur	sulfur	NOUN
ajst-31229	74	7	-	-	PUNCT
ajst-31229	74	8	bearing	bear	VERB
ajst-31229	74	9	minerals	mineral	NOUN
ajst-31229	74	10	can	can	AUX
ajst-31229	74	11	react	react	VERB
ajst-31229	74	12	with	with	ADP
ajst-31229	74	13	hydrogen	hydrogen	NOUN
ajst-31229	74	14	,	,	PUNCT
ajst-31229	74	15	forming	form	VERB
ajst-31229	74	16	h₂s	h₂s	ADV
ajst-31229	74	17	through	through	ADP
ajst-31229	74	18	abiotic	abiotic	ADJ
ajst-31229	74	19	or	or	CCONJ
ajst-31229	74	20	biotic	biotic	ADJ
ajst-31229	74	21	processes	process	NOUN
ajst-31229	74	22	,	,	PUNCT
ajst-31229	74	23	consuming	consume	VERB
ajst-31229	74	24	part	part	NOUN
ajst-31229	74	25	of	of	ADP
ajst-31229	74	26	the	the	DET
ajst-31229	74	27	stored	store	VERB
ajst-31229	74	28	hydrogen	hydrogen	NOUN
ajst-31229	74	29	and	and	CCONJ
ajst-31229	74	30	generating	generate	VERB
ajst-31229	74	31	corrosive	corrosive	ADJ
ajst-31229	74	32	byproducts	byproduct	NOUN
ajst-31229	74	33	[	[	X
ajst-31229	74	34	21	21	NUM
ajst-31229	74	35	]	]	SYM
ajst-31229	74	36	5.2	5.2	NUM
ajst-31229	74	37	.	.	PUNCT
ajst-31229	75	1	research	research	NOUN
ajst-31229	75	2	directions	direction	NOUN
ajst-31229	75	3	for	for	ADP
ajst-31229	75	4	underground	underground	ADJ
ajst-31229	75	5	hydrogen	hydrogen	NOUN
ajst-31229	75	6	storage	storage	NOUN
ajst-31229	75	7	current	current	ADJ
ajst-31229	75	8	research	research	NOUN
ajst-31229	75	9	is	be	AUX
ajst-31229	75	10	focused	focus	VERB
ajst-31229	75	11	on	on	ADP
ajst-31229	75	12	developing	develop	VERB
ajst-31229	75	13	coatings	coating	NOUN
ajst-31229	75	14	and	and	CCONJ
ajst-31229	75	15	alloys	alloy	NOUN
ajst-31229	75	16	for	for	ADP
ajst-31229	75	17	well	well	ADJ
ajst-31229	75	18	casings	casing	NOUN
ajst-31229	75	19	that	that	PRON
ajst-31229	75	20	resist	resist	VERB
ajst-31229	75	21	hydrogen	hydrogen	NOUN
ajst-31229	75	22	embrittlement	embrittlement	NOUN
ajst-31229	75	23	,	,	PUNCT
ajst-31229	75	24	as	as	ADV
ajst-31229	75	25	well	well	ADV
ajst-31229	75	26	as	as	ADP
ajst-31229	75	27	advanced	advanced	ADJ
ajst-31229	75	28	cement	cement	NOUN
ajst-31229	75	29	formulations	formulation	NOUN
ajst-31229	75	30	to	to	PART
ajst-31229	75	31	maintain	maintain	VERB
ajst-31229	75	32	zonal	zonal	ADJ
ajst-31229	75	33	isolation	isolation	NOUN
ajst-31229	75	34	.	.	PUNCT
ajst-31229	76	1	monitoring	monitor	VERB
ajst-31229	76	2	technologies	technology	NOUN
ajst-31229	76	3	—	—	PUNCT
ajst-31229	76	4	such	such	ADJ
ajst-31229	76	5	as	as	ADP
ajst-31229	76	6	fiber	fiber	NOUN
ajst-31229	76	7	-	-	PUNCT
ajst-31229	76	8	optic	optic	NOUN
ajst-31229	76	9	sensing	sensing	NOUN
ajst-31229	76	10	for	for	ADP
ajst-31229	76	11	real	real	ADJ
ajst-31229	76	12	-	-	PUNCT
ajst-31229	76	13	time	time	NOUN
ajst-31229	76	14	leak	leak	NOUN
ajst-31229	76	15	detection	detection	NOUN
ajst-31229	76	16	and	and	CCONJ
ajst-31229	76	17	geochemical	geochemical	ADJ
ajst-31229	76	18	fingerprinting	fingerprinting	NOUN
ajst-31229	76	19	to	to	PART
ajst-31229	76	20	assess	assess	VERB
ajst-31229	76	21	hydrogen	hydrogen	NOUN
ajst-31229	76	22	purity	purity	NOUN
ajst-31229	76	23	—	—	PUNCT
ajst-31229	76	24	are	be	AUX
ajst-31229	76	25	under	under	ADP
ajst-31229	76	26	active	active	ADJ
ajst-31229	76	27	development	development	NOUN
ajst-31229	76	28	.	.	PUNCT
ajst-31229	77	1	microbial	microbial	ADJ
ajst-31229	77	2	control	control	NOUN
ajst-31229	77	3	strategies	strategy	NOUN
ajst-31229	77	4	include	include	VERB
ajst-31229	77	5	biocide	biocide	NOUN
ajst-31229	77	6	injection	injection	NOUN
ajst-31229	77	7	and	and	CCONJ
ajst-31229	77	8	nutrient	nutrient	NOUN
ajst-31229	77	9	limitation	limitation	NOUN
ajst-31229	77	10	to	to	PART
ajst-31229	77	11	suppress	suppress	VERB
ajst-31229	77	12	sulfate	sulfate	NOUN
ajst-31229	77	13	-	-	PUNCT
ajst-31229	77	14	reducing	reduce	VERB
ajst-31229	77	15	and	and	CCONJ
ajst-31229	77	16	methanogenic	methanogenic	ADJ
ajst-31229	77	17	activity	activity	NOUN
ajst-31229	77	18	.	.	PUNCT
ajst-31229	78	1	reservoir	reservoir	PROPN
ajst-31229	78	2	simulation	simulation	NOUN
ajst-31229	78	3	models	model	NOUN
ajst-31229	78	4	have	have	AUX
ajst-31229	78	5	been	be	AUX
ajst-31229	78	6	refined	refine	VERB
ajst-31229	78	7	to	to	PART
ajst-31229	78	8	incorporate	incorporate	VERB
ajst-31229	78	9	hydrogen	hydrogen	NOUN
ajst-31229	78	10	-	-	PUNCT
ajst-31229	78	11	specific	specific	ADJ
ajst-31229	78	12	properties	property	NOUN
ajst-31229	78	13	,	,	PUNCT
ajst-31229	78	14	dual	dual	ADJ
ajst-31229	78	15	-	-	PUNCT
ajst-31229	78	16	porosity	porosity	NOUN
ajst-31229	78	17	effects	effect	NOUN
ajst-31229	78	18	,	,	PUNCT
ajst-31229	78	19	and	and	CCONJ
ajst-31229	78	20	coupled	couple	VERB
ajst-31229	78	21	geochemical	geochemical	ADJ
ajst-31229	78	22	reactions	reaction	NOUN
ajst-31229	78	23	to	to	PART
ajst-31229	78	24	predict	predict	VERB
ajst-31229	78	25	long	long	ADJ
ajst-31229	78	26	-	-	PUNCT
ajst-31229	78	27	term	term	NOUN
ajst-31229	78	28	storage	storage	NOUN
ajst-31229	78	29	performance	performance	NOUN
ajst-31229	78	30	.	.	PUNCT
ajst-31229	79	1	hybrid	hybrid	ADJ
ajst-31229	79	2	storage	storage	NOUN
ajst-31229	79	3	concepts	concept	NOUN
ajst-31229	79	4	,	,	PUNCT
ajst-31229	79	5	such	such	ADJ
ajst-31229	79	6	as	as	ADP
ajst-31229	79	7	blending	blend	VERB
ajst-31229	79	8	hydrogen	hydrogen	NOUN
ajst-31229	79	9	with	with	ADP
ajst-31229	79	10	natural	natural	ADJ
ajst-31229	79	11	gas	gas	NOUN
ajst-31229	79	12	to	to	PART
ajst-31229	79	13	create	create	VERB
ajst-31229	79	14	‘	'	PUNCT
ajst-31229	79	15	hythane	hythane	ADJ
ajst-31229	79	16	,	,	PUNCT
ajst-31229	79	17	’	'	PUNCT
ajst-31229	79	18	are	be	AUX
ajst-31229	79	19	also	also	ADV
ajst-31229	79	20	being	be	AUX
ajst-31229	79	21	explored	explore	VERB
ajst-31229	79	22	to	to	PART
ajst-31229	79	23	leverage	leverage	VERB
ajst-31229	79	24	existing	exist	VERB
ajst-31229	79	25	infrastructure	infrastructure	NOUN
ajst-31229	79	26	and	and	CCONJ
ajst-31229	79	27	mitigate	mitigate	VERB
ajst-31229	79	28	reactivity	reactivity	NOUN
ajst-31229	79	29	risks	risk	NOUN
ajst-31229	79	30	.	.	PUNCT
ajst-31229	80	1	6	6	X
ajst-31229	80	2	.	.	X
ajst-31229	80	3	summary	summary	NOUN
ajst-31229	80	4	under	under	ADP
ajst-31229	80	5	in	in	ADP
ajst-31229	80	6	-	-	PUNCT
ajst-31229	80	7	situ	situ	ADJ
ajst-31229	80	8	stress	stress	NOUN
ajst-31229	80	9	conditions	condition	NOUN
ajst-31229	80	10	,	,	PUNCT
ajst-31229	80	11	elevated	elevated	ADJ
ajst-31229	80	12	temperatures	temperature	NOUN
ajst-31229	80	13	,	,	PUNCT
ajst-31229	80	14	pressures	pressure	NOUN
ajst-31229	80	15	,	,	PUNCT
ajst-31229	80	16	and	and	CCONJ
ajst-31229	80	17	the	the	DET
ajst-31229	80	18	presence	presence	NOUN
ajst-31229	80	19	of	of	ADP
ajst-31229	80	20	organic	organic	ADJ
ajst-31229	80	21	acids	acid	NOUN
ajst-31229	80	22	can	can	AUX
ajst-31229	80	23	enhance	enhance	VERB
ajst-31229	80	24	caprock	caprock	NOUN
ajst-31229	80	25	sealing	sealing	NOUN
ajst-31229	80	26	by	by	ADP
ajst-31229	80	27	promoting	promote	VERB
ajst-31229	80	28	ductile	ductile	NOUN
ajst-31229	80	29	behavior	behavior	NOUN
ajst-31229	80	30	and	and	CCONJ
ajst-31229	80	31	selfhealing	selfheale	VERB
ajst-31229	80	32	of	of	ADP
ajst-31229	80	33	minor	minor	ADJ
ajst-31229	80	34	fractures	fracture	NOUN
ajst-31229	80	35	.	.	PUNCT
ajst-31229	81	1	china	china	PROPN
ajst-31229	81	2	’s	’s	PART
ajst-31229	81	3	vast	vast	ADJ
ajst-31229	81	4	resource	resource	NOUN
ajst-31229	81	5	advantage	advantage	NOUN
ajst-31229	81	6	—	—	PUNCT
ajst-31229	81	7	comprising	comprise	VERB
ajst-31229	81	8	numerous	numerous	ADJ
ajst-31229	81	9	potential	potential	ADJ
ajst-31229	81	10	depleted	deplete	VERB
ajst-31229	81	11	and	and	CCONJ
ajst-31229	81	12	declining	decline	VERB
ajst-31229	81	13	fields	field	NOUN
ajst-31229	81	14	—	—	PUNCT
ajst-31229	81	15	provides	provide	VERB
ajst-31229	81	16	ample	ample	ADJ
ajst-31229	81	17	opportunities	opportunity	NOUN
ajst-31229	81	18	to	to	PART
ajst-31229	81	19	develop	develop	VERB
ajst-31229	81	20	underground	underground	ADJ
ajst-31229	81	21	hydrogen	hydrogen	NOUN
ajst-31229	81	22	storage	storage	NOUN
ajst-31229	81	23	sites	site	NOUN
ajst-31229	81	24	.	.	PUNCT
ajst-31229	82	1	the	the	DET
ajst-31229	82	2	complex	complex	ADJ
ajst-31229	82	3	geological	geological	ADJ
ajst-31229	82	4	conditions	condition	NOUN
ajst-31229	82	5	in	in	ADP
ajst-31229	82	6	many	many	ADJ
ajst-31229	82	7	basins	basin	NOUN
ajst-31229	82	8	foster	foster	ADJ
ajst-31229	82	9	innovations	innovation	NOUN
ajst-31229	82	10	in	in	ADP
ajst-31229	82	11	reservoir	reservoir	NOUN
ajst-31229	82	12	management	management	NOUN
ajst-31229	82	13	,	,	PUNCT
ajst-31229	82	14	monitoring	monitoring	NOUN
ajst-31229	82	15	technologies	technology	NOUN
ajst-31229	82	16	,	,	PUNCT
ajst-31229	82	17	and	and	CCONJ
ajst-31229	82	18	integrity	integrity	NOUN
ajst-31229	82	19	assurance	assurance	NOUN
ajst-31229	82	20	.	.	PUNCT
ajst-31229	83	1	furthermore	furthermore	ADV
ajst-31229	83	2	,	,	PUNCT
ajst-31229	83	3	the	the	DET
ajst-31229	83	4	coordination	coordination	NOUN
ajst-31229	83	5	between	between	ADP
ajst-31229	83	6	upstream	upstream	ADJ
ajst-31229	83	7	and	and	CCONJ
ajst-31229	83	8	downstream	downstream	ADJ
ajst-31229	83	9	segments	segment	NOUN
ajst-31229	83	10	of	of	ADP
ajst-31229	83	11	the	the	DET
ajst-31229	83	12	hydrogen	hydrogen	NOUN
ajst-31229	83	13	energy	energy	NOUN
ajst-31229	83	14	industry	industry	NOUN
ajst-31229	83	15	chain	chain	NOUN
ajst-31229	83	16	supports	support	VERB
ajst-31229	83	17	the	the	DET
ajst-31229	83	18	development	development	NOUN
ajst-31229	83	19	of	of	ADP
ajst-31229	83	20	integrated	integrated	ADJ
ajst-31229	83	21	solutions	solution	NOUN
ajst-31229	83	22	,	,	PUNCT
ajst-31229	83	23	from	from	ADP
ajst-31229	83	24	hydrogen	hydrogen	NOUN
ajst-31229	83	25	production	production	NOUN
ajst-31229	83	26	and	and	CCONJ
ajst-31229	83	27	transport	transport	NOUN
ajst-31229	83	28	to	to	ADP
ajst-31229	83	29	underground	underground	ADJ
ajst-31229	83	30	storage	storage	NOUN
ajst-31229	83	31	and	and	CCONJ
ajst-31229	83	32	distribution	distribution	NOUN
ajst-31229	83	33	.	.	PUNCT
ajst-31229	84	1	the	the	DET
ajst-31229	84	2	broad	broad	ADJ
ajst-31229	84	3	market	market	NOUN
ajst-31229	84	4	applications	application	NOUN
ajst-31229	84	5	,	,	PUNCT
ajst-31229	84	6	including	include	VERB
ajst-31229	84	7	grid	grid	NOUN
ajst-31229	84	8	balancing	balancing	NOUN
ajst-31229	84	9	,	,	PUNCT
ajst-31229	84	10	renewable	renewable	ADJ
ajst-31229	84	11	energy	energy	NOUN
ajst-31229	84	12	buffering	buffering	NOUN
ajst-31229	84	13	,	,	PUNCT
ajst-31229	84	14	and	and	CCONJ
ajst-31229	84	15	decarbonizing	decarbonize	VERB
ajst-31229	84	16	hard	hard	ADJ
ajst-31229	84	17	-	-	PUNCT
ajst-31229	84	18	to	to	PART
ajst-31229	84	19	-	-	PUNCT
ajst-31229	84	20	abate	abate	VERB
ajst-31229	84	21	sectors	sector	NOUN
ajst-31229	84	22	,	,	PUNCT
ajst-31229	84	23	underscore	underscore	VERB
ajst-31229	84	24	the	the	DET
ajst-31229	84	25	potential	potential	ADJ
ajst-31229	84	26	scale	scale	NOUN
ajst-31229	84	27	advantage	advantage	NOUN
ajst-31229	84	28	of	of	ADP
ajst-31229	84	29	underground	underground	ADJ
ajst-31229	84	30	hydrogen	hydrogen	NOUN
ajst-31229	84	31	storage	storage	NOUN
ajst-31229	84	32	.	.	PUNCT
ajst-31229	85	1	while	while	SCONJ
ajst-31229	85	2	china	china	PROPN
ajst-31229	85	3	possesses	possess	VERB
ajst-31229	85	4	favorable	favorable	ADJ
ajst-31229	85	5	conditions	condition	NOUN
ajst-31229	85	6	and	and	CCONJ
ajst-31229	85	7	a	a	DET
ajst-31229	85	8	solid	solid	ADJ
ajst-31229	85	9	foundation	foundation	NOUN
ajst-31229	85	10	for	for	ADP
ajst-31229	85	11	industrial	industrial	ADJ
ajst-31229	85	12	-	-	PUNCT
ajst-31229	85	13	scale	scale	NOUN
ajst-31229	85	14	deployment	deployment	NOUN
ajst-31229	85	15	,	,	PUNCT
ajst-31229	85	16	domestic	domestic	ADJ
ajst-31229	85	17	underground	underground	ADJ
ajst-31229	85	18	hydrogen	hydrogen	NOUN
ajst-31229	85	19	storage	storage	NOUN
ajst-31229	85	20	remains	remain	VERB
ajst-31229	85	21	at	at	ADP
ajst-31229	85	22	an	an	DET
ajst-31229	85	23	early	early	ADJ
ajst-31229	85	24	stage	stage	NOUN
ajst-31229	85	25	.	.	PUNCT
ajst-31229	86	1	key	key	ADJ
ajst-31229	86	2	hardware	hardware	NOUN
ajst-31229	86	3	and	and	CCONJ
ajst-31229	86	4	software	software	NOUN
ajst-31229	86	5	technologies	technology	NOUN
ajst-31229	86	6	—	—	PUNCT
ajst-31229	86	7	such	such	ADJ
ajst-31229	86	8	as	as	ADP
ajst-31229	86	9	large	large	ADJ
ajst-31229	86	10	-	-	PUNCT
ajst-31229	86	11	scale	scale	NOUN
ajst-31229	86	12	salt	salt	NOUN
ajst-31229	86	13	cavern	cavern	NOUN
ajst-31229	86	14	construction	construction	NOUN
ajst-31229	86	15	,	,	PUNCT
ajst-31229	86	16	advanced	advanced	ADJ
ajst-31229	86	17	wellbore	wellbore	NOUN
ajst-31229	86	18	materials	material	NOUN
ajst-31229	86	19	,	,	PUNCT
ajst-31229	86	20	and	and	CCONJ
ajst-31229	86	21	comprehensive	comprehensive	ADJ
ajst-31229	86	22	reservoir	reservoir	PROPN
ajst-31229	86	23	simulation	simulation	NOUN
ajst-31229	86	24	platforms	platform	NOUN
ajst-31229	86	25	—	—	PUNCT
ajst-31229	86	26	have	have	VERB
ajst-31229	86	27	yet	yet	ADV
ajst-31229	86	28	to	to	ADP
ajst-31229	86	29	123	123	NUM
ajst-31229	86	30	coalesce	coalesce	NOUN
ajst-31229	86	31	into	into	ADP
ajst-31229	86	32	a	a	DET
ajst-31229	86	33	mature	mature	ADJ
ajst-31229	86	34	,	,	PUNCT
ajst-31229	86	35	standardized	standardized	ADJ
ajst-31229	86	36	development	development	NOUN
ajst-31229	86	37	framework	framework	NOUN
ajst-31229	86	38	.	.	PUNCT
ajst-31229	87	1	continued	continue	VERB
ajst-31229	87	2	research	research	NOUN
ajst-31229	87	3	,	,	PUNCT
ajst-31229	87	4	pilot	pilot	NOUN
ajst-31229	87	5	demonstrations	demonstration	NOUN
ajst-31229	87	6	,	,	PUNCT
ajst-31229	87	7	and	and	CCONJ
ajst-31229	87	8	policy	policy	NOUN
ajst-31229	87	9	support	support	NOUN
ajst-31229	87	10	are	be	AUX
ajst-31229	87	11	essential	essential	ADJ
ajst-31229	87	12	to	to	PART
ajst-31229	87	13	realize	realize	VERB
ajst-31229	87	14	the	the	DET
ajst-31229	87	15	full	full	ADJ
ajst-31229	87	16	potential	potential	NOUN
ajst-31229	87	17	of	of	ADP
ajst-31229	87	18	underground	underground	ADJ
ajst-31229	87	19	hydrogen	hydrogen	NOUN
ajst-31229	87	20	storage	storage	NOUN
ajst-31229	87	21	in	in	ADP
ajst-31229	87	22	the	the	DET
ajst-31229	87	23	next	next	ADJ
ajst-31229	87	24	decade	decade	NOUN
ajst-31229	87	25	.	.	PUNCT
ajst-31229	88	1	references	reference	NOUN
ajst-31229	88	2	[	[	X
ajst-31229	88	3	1	1	NUM
ajst-31229	88	4	]	]	PUNCT
ajst-31229	88	5	züttel	züttel	NOUN
ajst-31229	88	6	a.	a.	NOUN
ajst-31229	88	7	materials	material	NOUN
ajst-31229	88	8	for	for	ADP
ajst-31229	88	9	hydrogen	hydrogen	NOUN
ajst-31229	88	10	storage	storage	NOUN
ajst-31229	88	11	.	.	PUNCT
ajst-31229	89	1	mater	mater	NOUN
ajst-31229	89	2	today	today	NOUN
ajst-31229	89	3	.	.	PUNCT
ajst-31229	90	1	2003;6(9):24	2003;6(9):24	NUM
ajst-31229	90	2	-	-	SYM
ajst-31229	90	3	33	33	NUM
ajst-31229	90	4	.	.	PUNCT
ajst-31229	91	1	[	[	X
ajst-31229	91	2	2	2	NUM
ajst-31229	91	3	]	]	PUNCT
ajst-31229	91	4	crabtree	crabtree	PROPN
ajst-31229	91	5	g	g	PROPN
ajst-31229	91	6	,	,	PUNCT
ajst-31229	91	7	dresselhaus	dresselhaus	PROPN
ajst-31229	91	8	ms	ms	PROPN
ajst-31229	91	9	,	,	PUNCT
ajst-31229	91	10	buchanan	buchanan	PROPN
ajst-31229	91	11	mv	mv	PROPN
ajst-31229	91	12	.	.	PUNCT
ajst-31229	92	1	the	the	DET
ajst-31229	92	2	hydrogen	hydrogen	NOUN
ajst-31229	92	3	economy	economy	NOUN
ajst-31229	92	4	.	.	PUNCT
ajst-31229	93	1	phys	phy	NOUN
ajst-31229	93	2	today	today	NOUN
ajst-31229	93	3	.	.	PUNCT
ajst-31229	94	1	2004;57(12):39	2004;57(12):39	NUM
ajst-31229	94	2	-	-	SYM
ajst-31229	94	3	44	44	NUM
ajst-31229	94	4	.	.	PUNCT
ajst-31229	95	1	[	[	X
ajst-31229	95	2	3	3	X
ajst-31229	95	3	]	]	X
ajst-31229	95	4	eu	eu	PROPN
ajst-31229	95	5	hyunder	hyunder	PROPN
ajst-31229	95	6	project	project	PROPN
ajst-31229	95	7	consortium	consortium	NOUN
ajst-31229	95	8	.	.	PUNCT
ajst-31229	96	1	underground	underground	ADJ
ajst-31229	96	2	hydrogen	hydrogen	NOUN
ajst-31229	96	3	storage	storage	NOUN
ajst-31229	96	4	(	(	PUNCT
ajst-31229	96	5	hyunder	hyunder	ADJ
ajst-31229	96	6	):	):	PUNCT
ajst-31229	96	7	final	final	ADJ
ajst-31229	96	8	report	report	NOUN
ajst-31229	96	9	.	.	PUNCT
ajst-31229	97	1	european	european	PROPN
ajst-31229	97	2	commission	commission	PROPN
ajst-31229	97	3	;	;	PUNCT
ajst-31229	97	4	2018	2018	NUM
ajst-31229	97	5	.	.	PUNCT
ajst-31229	98	1	[	[	X
ajst-31229	98	2	4	4	X
ajst-31229	98	3	]	]	X
ajst-31229	98	4	national	national	ADJ
ajst-31229	98	5	renewable	renewable	ADJ
ajst-31229	98	6	energy	energy	NOUN
ajst-31229	98	7	laboratory	laboratory	NOUN
ajst-31229	98	8	(	(	PUNCT
ajst-31229	98	9	nrel	nrel	NOUN
ajst-31229	98	10	)	)	PUNCT
ajst-31229	98	11	.	.	PUNCT
ajst-31229	99	1	hydrogen	hydrogen	NOUN
ajst-31229	99	2	storage	storage	NOUN
ajst-31229	99	3	in	in	ADP
ajst-31229	99	4	geologic	geologic	ADJ
ajst-31229	99	5	formations	formation	NOUN
ajst-31229	99	6	:	:	PUNCT
ajst-31229	99	7	a	a	DET
ajst-31229	99	8	review	review	NOUN
ajst-31229	99	9	.	.	PUNCT
ajst-31229	100	1	nrel	nrel	NOUN
ajst-31229	100	2	/	/	SYM
ajst-31229	100	3	tp-5700136	tp-5700136	NOUN
ajst-31229	100	4	-	-	PUNCT
ajst-31229	100	5	149	149	NUM
ajst-31229	100	6	;	;	PUNCT
ajst-31229	100	7	2019	2019	NUM
ajst-31229	100	8	.	.	PUNCT
ajst-31229	101	1	[	[	X
ajst-31229	101	2	5	5	NUM
ajst-31229	101	3	]	]	SYM
ajst-31229	101	4	li	li	PROPN
ajst-31229	101	5	y	y	PROPN
ajst-31229	101	6	,	,	PUNCT
ajst-31229	101	7	wang	wang	PROPN
ajst-31229	101	8	j	j	PROPN
ajst-31229	101	9	,	,	PUNCT
ajst-31229	101	10	zhang	zhang	PROPN
ajst-31229	101	11	h.	h.	PROPN
ajst-31229	101	12	research	research	PROPN
ajst-31229	101	13	on	on	ADP
ajst-31229	101	14	underground	underground	ADJ
ajst-31229	101	15	hydrogen	hydrogen	NOUN
ajst-31229	101	16	storage	storage	NOUN
ajst-31229	101	17	in	in	ADP
ajst-31229	101	18	china	china	PROPN
ajst-31229	101	19	:	:	PUNCT
ajst-31229	101	20	status	status	NOUN
ajst-31229	101	21	and	and	CCONJ
ajst-31229	101	22	prospects	prospect	NOUN
ajst-31229	101	23	.	.	PUNCT
ajst-31229	102	1	energy	energy	NOUN
ajst-31229	102	2	procedia	procedia	PROPN
ajst-31229	102	3	.	.	PUNCT
ajst-31229	103	1	2020;158:140	2020;158:140	NUM
ajst-31229	103	2	-	-	SYM
ajst-31229	103	3	154	154	NUM
ajst-31229	103	4	.	.	PUNCT
ajst-31229	104	1	[	[	X
ajst-31229	104	2	6	6	NUM
ajst-31229	104	3	]	]	PUNCT
ajst-31229	104	4	sattler	sattler	NOUN
ajst-31229	104	5	s	s	PROPN
ajst-31229	104	6	,	,	PUNCT
ajst-31229	104	7	bazan	bazan	PROPN
ajst-31229	104	8	o	o	PROPN
ajst-31229	104	9	,	,	PUNCT
ajst-31229	104	10	droste	droste	NOUN
ajst-31229	104	11	-	-	PUNCT
ajst-31229	104	12	franke	franke	PROPN
ajst-31229	104	13	b.	b.	PROPN
ajst-31229	104	14	technical	technical	PROPN
ajst-31229	104	15	and	and	CCONJ
ajst-31229	104	16	economic	economic	ADJ
ajst-31229	104	17	evaluation	evaluation	NOUN
ajst-31229	104	18	of	of	ADP
ajst-31229	104	19	hydrogen	hydrogen	NOUN
ajst-31229	104	20	storage	storage	NOUN
ajst-31229	104	21	options	option	NOUN
ajst-31229	104	22	.	.	PUNCT
ajst-31229	105	1	int	int	NOUN
ajst-31229	105	2	j	j	PROPN
ajst-31229	105	3	hydrogen	hydrogen	NOUN
ajst-31229	105	4	energy	energy	NOUN
ajst-31229	105	5	.	.	PUNCT
ajst-31229	106	1	2017;42(21):139	2017;42(21):139	PROPN
ajst-31229	106	2	-	-	PUNCT
ajst-31229	106	3	144	144	NUM
ajst-31229	106	4	.	.	PUNCT
ajst-31229	107	1	[	[	X
ajst-31229	107	2	7	7	X
ajst-31229	107	3	]	]	X
ajst-31229	107	4	heide	heide	NOUN
ajst-31229	107	5	p	p	NOUN
ajst-31229	107	6	,	,	PUNCT
ajst-31229	107	7	batzel	batzel	PROPN
ajst-31229	107	8	t	t	PROPN
ajst-31229	107	9	,	,	PUNCT
ajst-31229	107	10	baumann	baumann	PROPN
ajst-31229	107	11	k.	k.	PROPN
ajst-31229	107	12	comparative	comparative	PROPN
ajst-31229	107	13	analysis	analysis	NOUN
ajst-31229	107	14	of	of	ADP
ajst-31229	107	15	subsurface	subsurface	NOUN
ajst-31229	107	16	hydrogen	hydrogen	NOUN
ajst-31229	107	17	storage	storage	NOUN
ajst-31229	107	18	options	option	NOUN
ajst-31229	107	19	.	.	PUNCT
ajst-31229	108	1	energy	energy	NOUN
ajst-31229	108	2	storage	storage	NOUN
ajst-31229	108	3	mater	mater	NOUN
ajst-31229	108	4	.	.	PUNCT
ajst-31229	109	1	2019;153	2019;153	NUM
ajst-31229	109	2	-	-	PUNCT
ajst-31229	109	3	165	165	NUM
ajst-31229	109	4	-	-	PUNCT
ajst-31229	109	5	230	230	NUM
ajst-31229	109	6	-	-	NUM
ajst-31229	109	7	248	248	NUM
ajst-31229	109	8	.	.	PUNCT
ajst-31229	110	1	[	[	X
ajst-31229	110	2	8	8	NUM
ajst-31229	110	3	]	]	X
ajst-31229	110	4	weast	weast	PROPN
ajst-31229	110	5	rc	rc	PROPN
ajst-31229	110	6	,	,	PUNCT
ajst-31229	110	7	astle	astle	PROPN
ajst-31229	110	8	mj	mj	PROPN
ajst-31229	110	9	,	,	PUNCT
ajst-31229	110	10	beyer	beyer	PROPN
ajst-31229	110	11	wh	wh	PROPN
ajst-31229	110	12	.	.	PROPN
ajst-31229	110	13	handbook	handbook	NOUN
ajst-31229	110	14	of	of	ADP
ajst-31229	110	15	chemistry	chemistry	NOUN
ajst-31229	110	16	and	and	CCONJ
ajst-31229	110	17	physics	physics	NOUN
ajst-31229	110	18	.	.	PUNCT
ajst-31229	111	1	58th	58th	ADJ
ajst-31229	111	2	ed	ed	NOUN
ajst-31229	111	3	.	.	PUNCT
ajst-31229	112	1	crc	crc	PROPN
ajst-31229	112	2	press	press	PROPN
ajst-31229	112	3	;	;	PUNCT
ajst-31229	112	4	1977	1977	NUM
ajst-31229	112	5	.	.	PUNCT
ajst-31229	113	1	[	[	X
ajst-31229	113	2	9	9	NUM
ajst-31229	113	3	]	]	X
ajst-31229	113	4	kaltschmitt	kaltschmitt	X
ajst-31229	113	5	m	m	PROPN
ajst-31229	113	6	,	,	PUNCT
ajst-31229	113	7	reinhardt	reinhardt	PROPN
ajst-31229	113	8	g	g	PROPN
ajst-31229	113	9	,	,	PUNCT
ajst-31229	113	10	wiese	wiese	PROPN
ajst-31229	113	11	a.	a.	NOUN
ajst-31229	113	12	renewable	renewable	ADJ
ajst-31229	113	13	energy	energy	NOUN
ajst-31229	113	14	:	:	PUNCT
ajst-31229	113	15	technology	technology	NOUN
ajst-31229	113	16	,	,	PUNCT
ajst-31229	113	17	economics	economic	NOUN
ajst-31229	113	18	and	and	CCONJ
ajst-31229	113	19	environment	environment	NOUN
ajst-31229	113	20	.	.	PUNCT
ajst-31229	114	1	springer	springer	NOUN
ajst-31229	114	2	;	;	PUNCT
ajst-31229	114	3	2007	2007	NUM
ajst-31229	114	4	.	.	PUNCT
ajst-31229	115	1	[	[	X
ajst-31229	115	2	10	10	NUM
ajst-31229	115	3	]	]	X
ajst-31229	115	4	turner	turner	PROPN
ajst-31229	115	5	ja	ja	PROPN
ajst-31229	115	6	.	.	PUNCT
ajst-31229	116	1	a	a	DET
ajst-31229	116	2	realizable	realizable	ADJ
ajst-31229	116	3	renewable	renewable	ADJ
ajst-31229	116	4	energy	energy	NOUN
ajst-31229	116	5	future	future	NOUN
ajst-31229	116	6	.	.	PUNCT
ajst-31229	117	1	science	science	NOUN
ajst-31229	117	2	.	.	PUNCT
ajst-31229	118	1	1999	1999	NUM
ajst-31229	118	2	jan	jan	PROPN
ajst-31229	118	3	15;285(5428):687	15;285(5428):687	NUM
ajst-31229	118	4	-	-	SYM
ajst-31229	118	5	689	689	NUM
ajst-31229	118	6	.	.	PUNCT
ajst-31229	119	1	[	[	X
ajst-31229	119	2	11	11	NUM
ajst-31229	119	3	]	]	X
ajst-31229	119	4	román	román	NOUN
ajst-31229	119	5	-	-	PUNCT
ajst-31229	119	6	leshkov	leshkov	PROPN
ajst-31229	119	7	y	y	PROPN
ajst-31229	119	8	,	,	PUNCT
ajst-31229	119	9	guardani	guardani	PROPN
ajst-31229	119	10	n	n	CCONJ
ajst-31229	119	11	,	,	PUNCT
ajst-31229	119	12	roman	roman	ADJ
ajst-31229	119	13	-	-	PUNCT
ajst-31229	119	14	leshkov	leshkov	NOUN
ajst-31229	119	15	y.	y.	PROPN
ajst-31229	119	16	energy	energy	NOUN
ajst-31229	119	17	density	density	NOUN
ajst-31229	119	18	metrics	metric	NOUN
ajst-31229	119	19	for	for	ADP
ajst-31229	119	20	fuel	fuel	NOUN
ajst-31229	119	21	comparison	comparison	NOUN
ajst-31229	119	22	.	.	PUNCT
ajst-31229	120	1	j	j	PROPN
ajst-31229	120	2	energy	energy	NOUN
ajst-31229	120	3	storage	storage	NOUN
ajst-31229	120	4	.	.	PUNCT
ajst-31229	121	1	2021	2021	NUM
ajst-31229	121	2	;	;	PUNCT
ajst-31229	121	3	172	172	NUM
ajst-31229	121	4	-	-	SYM
ajst-31229	121	5	191	191	NUM
ajst-31229	121	6	-	-	NUM
ajst-31229	121	7	129	129	NUM
ajst-31229	121	8	-	-	SYM
ajst-31229	121	9	145	145	NUM
ajst-31229	121	10	.	.	PUNCT
ajst-31229	122	1	[	[	X
ajst-31229	122	2	12	12	NUM
ajst-31229	122	3	]	]	X
ajst-31229	122	4	dunn	dunn	PROPN
ajst-31229	122	5	s.	s.	PROPN
ajst-31229	122	6	hydrogen	hydrogen	PROPN
ajst-31229	122	7	futures	future	NOUN
ajst-31229	122	8	:	:	PUNCT
ajst-31229	122	9	toward	toward	ADP
ajst-31229	122	10	a	a	DET
ajst-31229	122	11	sustainable	sustainable	ADJ
ajst-31229	122	12	energy	energy	NOUN
ajst-31229	122	13	system	system	NOUN
ajst-31229	122	14	.	.	PUNCT
ajst-31229	123	1	int	int	PROPN
ajst-31229	123	2	j	j	PROPN
ajst-31229	123	3	hydrogen	hydrogen	NOUN
ajst-31229	123	4	energy	energy	NOUN
ajst-31229	123	5	.	.	PUNCT
ajst-31229	124	1	2002;27(3):235	2002;27(3):235	NUM
ajst-31229	124	2	-	-	SYM
ajst-31229	124	3	264	264	NUM
ajst-31229	124	4	.	.	PUNCT
ajst-31229	125	1	[	[	X
ajst-31229	125	2	13	13	NUM
ajst-31229	125	3	]	]	X
ajst-31229	125	4	balta	balta	PROPN
ajst-31229	125	5	-	-	PUNCT
ajst-31229	125	6	ozkan	ozkan	NOUN
ajst-31229	125	7	n	n	PROPN
ajst-31229	125	8	,	,	PUNCT
ajst-31229	125	9	yildiz	yildiz	PROPN
ajst-31229	125	10	ö	ö	PROPN
ajst-31229	125	11	,	,	PUNCT
ajst-31229	125	12	connor	connor	NOUN
ajst-31229	125	13	p	p	NOUN
ajst-31229	125	14	,	,	PUNCT
ajst-31229	125	15	truckell	truckell	ADJ
ajst-31229	125	16	i.	i.	NOUN
ajst-31229	125	17	analysis	analysis	NOUN
ajst-31229	125	18	of	of	ADP
ajst-31229	125	19	hydrogen	hydrogen	NOUN
ajst-31229	125	20	production	production	NOUN
ajst-31229	125	21	from	from	ADP
ajst-31229	125	22	renewable	renewable	ADJ
ajst-31229	125	23	sources	source	NOUN
ajst-31229	125	24	.	.	PUNCT
ajst-31229	126	1	energy	energy	NOUN
ajst-31229	126	2	policy	policy	NOUN
ajst-31229	126	3	.	.	PUNCT
ajst-31229	127	1	2013;118	2013;118	NUM
ajst-31229	127	2	-	-	PUNCT
ajst-31229	127	3	128	128	NUM
ajst-31229	127	4	-	-	PUNCT
ajst-31229	127	5	209	209	NUM
ajst-31229	127	6	-	-	PUNCT
ajst-31229	127	7	218	218	NUM
ajst-31229	127	8	.	.	PUNCT
ajst-31229	128	1	[	[	X
ajst-31229	128	2	14	14	NUM
ajst-31229	128	3	]	]	SYM
ajst-31229	128	4	dincer	dincer	NOUN
ajst-31229	128	5	i	i	PROPN
ajst-31229	128	6	,	,	PUNCT
ajst-31229	128	7	acar	acar	ADJ
ajst-31229	128	8	c.	c.	PROPN
ajst-31229	128	9	review	review	NOUN
ajst-31229	128	10	and	and	CCONJ
ajst-31229	128	11	evaluation	evaluation	NOUN
ajst-31229	128	12	of	of	ADP
ajst-31229	128	13	hydrogen	hydrogen	NOUN
ajst-31229	128	14	production	production	NOUN
ajst-31229	128	15	methods	method	NOUN
ajst-31229	128	16	for	for	ADP
ajst-31229	128	17	better	well	ADJ
ajst-31229	128	18	sustainability	sustainability	NOUN
ajst-31229	128	19	.	.	PUNCT
ajst-31229	129	1	int	int	PROPN
ajst-31229	129	2	j	j	PROPN
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ajst-31229	129	4	energy	energy	NOUN
ajst-31229	129	5	.	.	PUNCT
ajst-31229	130	1	2015;40(34):11094	2015;40(34):11094	NUM
ajst-31229	130	2	-	-	SYM
ajst-31229	130	3	11111	11111	NUM
ajst-31229	130	4	.	.	PUNCT
ajst-31229	131	1	[	[	X
ajst-31229	131	2	15	15	NUM
ajst-31229	131	3	]	]	X
ajst-31229	131	4	sharma	sharma	PROPN
ajst-31229	131	5	v	v	PROPN
ajst-31229	131	6	,	,	PUNCT
ajst-31229	131	7	singh	singh	PROPN
ajst-31229	131	8	s	s	PROPN
ajst-31229	131	9	,	,	PUNCT
ajst-31229	131	10	rao	rao	PROPN
ajst-31229	131	11	mv	mv	PROPN
ajst-31229	131	12	.	.	PROPN
ajst-31229	131	13	review	review	PROPN
ajst-31229	131	14	of	of	ADP
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ajst-31229	131	16	storage	storage	NOUN
ajst-31229	131	17	technologies	technology	NOUN
ajst-31229	131	18	.	.	PUNCT
ajst-31229	132	1	renew	renew	VERB
ajst-31229	132	2	sustain	sustain	ADJ
ajst-31229	132	3	energy	energy	NOUN
ajst-31229	132	4	rev	rev	X
ajst-31229	132	5	.	.	PROPN
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ajst-31229	132	7	-	-	PUNCT
ajst-31229	132	8	819	819	NUM
ajst-31229	132	9	.	.	PUNCT
ajst-31229	133	1	[	[	X
ajst-31229	133	2	16	16	NUM
ajst-31229	133	3	]	]	X
ajst-31229	133	4	ahluwalia	ahluwalia	PROPN
ajst-31229	133	5	rk	rk	PROPN
ajst-31229	133	6	,	,	PUNCT
ajst-31229	133	7	hua	hua	PROPN
ajst-31229	133	8	tq	tq	INTJ
ajst-31229	133	9	.	.	PUNCT
ajst-31229	134	1	on	on	ADP
ajst-31229	134	2	-	-	PUNCT
ajst-31229	134	3	board	board	NOUN
ajst-31229	134	4	and	and	CCONJ
ajst-31229	134	5	off	off	ADP
ajst-31229	134	6	-	-	PUNCT
ajst-31229	134	7	board	board	NOUN
ajst-31229	134	8	hydrogen	hydrogen	NOUN
ajst-31229	134	9	storage	storage	NOUN
ajst-31229	134	10	solutions	solution	NOUN
ajst-31229	134	11	for	for	ADP
ajst-31229	134	12	vehicles	vehicle	NOUN
ajst-31229	134	13	.	.	PUNCT
ajst-31229	135	1	appl	appl	PROPN
ajst-31229	135	2	phys	phy	NOUN
ajst-31229	135	3	a.	a.	NOUN
ajst-31229	135	4	2007;89(2):965970	2007;89(2):965970	PROPN
ajst-31229	135	5	.	.	PUNCT
ajst-31229	136	1	[	[	X
ajst-31229	136	2	17	17	NUM
ajst-31229	136	3	]	]	X
ajst-31229	136	4	fiocco	fiocco	ADJ
ajst-31229	136	5	o	o	NOUN
ajst-31229	136	6	,	,	PUNCT
ajst-31229	136	7	catarci	catarci	PROPN
ajst-31229	136	8	t	t	PROPN
ajst-31229	136	9	,	,	PUNCT
ajst-31229	136	10	ragone	ragone	PROPN
ajst-31229	136	11	pg	pg	NOUN
ajst-31229	136	12	.	.	PUNCT
ajst-31229	137	1	large	large	ADJ
ajst-31229	137	2	-	-	PUNCT
ajst-31229	137	3	scale	scale	NOUN
ajst-31229	137	4	hydrogen	hydrogen	NOUN
ajst-31229	137	5	storage	storage	NOUN
ajst-31229	137	6	:	:	PUNCT
ajst-31229	137	7	worldwide	worldwide	ADJ
ajst-31229	137	8	status	status	NOUN
ajst-31229	137	9	and	and	CCONJ
ajst-31229	137	10	perspectives	perspective	NOUN
ajst-31229	137	11	.	.	PUNCT
ajst-31229	138	1	int	int	NOUN
ajst-31229	138	2	j	j	PROPN
ajst-31229	138	3	hydrogen	hydrogen	NOUN
ajst-31229	138	4	energy	energy	NOUN
ajst-31229	138	5	.	.	PUNCT
ajst-31229	139	1	2019;44(35):19777	2019;44(35):19777	NUM
ajst-31229	139	2	-	-	SYM
ajst-31229	139	3	19792	19792	NUM
ajst-31229	139	4	.	.	PUNCT
ajst-31229	140	1	[	[	X
ajst-31229	140	2	18	18	NUM
ajst-31229	140	3	]	]	X
ajst-31229	140	4	blackwell	blackwell	PROPN
ajst-31229	140	5	da	da	PROPN
ajst-31229	140	6	,	,	PUNCT
ajst-31229	140	7	golding	golding	NOUN
ajst-31229	140	8	sd	sd	PROPN
ajst-31229	140	9	,	,	PUNCT
ajst-31229	140	10	lee	lee	PROPN
ajst-31229	140	11	mk	mk	PROPN
ajst-31229	140	12	.	.	PUNCT
ajst-31229	140	13	mineralogical	mineralogical	ADJ
ajst-31229	140	14	changes	change	NOUN
ajst-31229	140	15	during	during	ADP
ajst-31229	140	16	hydrogen	hydrogen	NOUN
ajst-31229	140	17	storage	storage	NOUN
ajst-31229	140	18	in	in	ADP
ajst-31229	140	19	subsurface	subsurface	NOUN
ajst-31229	140	20	formations	formation	NOUN
ajst-31229	140	21	.	.	PUNCT
ajst-31229	141	1	appl	appl	PROPN
ajst-31229	141	2	geochem	geochem	PROPN
ajst-31229	141	3	.	.	PUNCT
ajst-31229	142	1	2020;112:104513	2020;112:104513	NUM
ajst-31229	142	2	.	.	PUNCT
ajst-31229	143	1	[	[	X
ajst-31229	143	2	19	19	NUM
ajst-31229	143	3	]	]	X
ajst-31229	143	4	perfetti	perfetti	PROPN
ajst-31229	143	5	j	j	PROPN
ajst-31229	143	6	,	,	PUNCT
ajst-31229	143	7	steiger	steiger	PROPN
ajst-31229	143	8	r	r	PROPN
ajst-31229	143	9	,	,	PUNCT
ajst-31229	143	10	eiswirth	eiswirth	ADJ
ajst-31229	143	11	m.	m.	NOUN
ajst-31229	143	12	hydrogen	hydrogen	NOUN
ajst-31229	143	13	-	-	PUNCT
ajst-31229	143	14	mineral	mineral	NOUN
ajst-31229	143	15	interactions	interaction	NOUN
ajst-31229	143	16	in	in	ADP
ajst-31229	143	17	sandstone	sandstone	NOUN
ajst-31229	143	18	reservoirs	reservoir	NOUN
ajst-31229	143	19	.	.	PUNCT
ajst-31229	144	1	geofluids	geofluids	PROPN
ajst-31229	144	2	.	.	PUNCT
ajst-31229	145	1	2018	2018	NUM
ajst-31229	145	2	;	;	PUNCT
ajst-31229	145	3	2018	2018	NUM
ajst-31229	145	4	:	:	PUNCT
ajst-31229	145	5	210	210	NUM
ajst-31229	145	6	-	-	SYM
ajst-31229	145	7	225	225	NUM
ajst-31229	145	8	.	.	PUNCT
ajst-31229	146	1	[	[	X
ajst-31229	146	2	20	20	NUM
ajst-31229	146	3	]	]	X
ajst-31229	146	4	heinemann	heinemann	PROPN
ajst-31229	146	5	n	n	SYM
ajst-31229	146	6	,	,	PUNCT
ajst-31229	146	7	helsingen	helsingen	X
ajst-31229	146	8	k	k	NOUN
ajst-31229	146	9	,	,	PUNCT
ajst-31229	146	10	schuster	schuster	PROPN
ajst-31229	146	11	t.	t.	PROPN
ajst-31229	146	12	modelling	model	VERB
ajst-31229	146	13	hydrogen	hydrogen	NOUN
ajst-31229	146	14	diffusion	diffusion	NOUN
ajst-31229	146	15	in	in	ADP
ajst-31229	146	16	fractured	fractured	ADJ
ajst-31229	146	17	caprocks	caprock	NOUN
ajst-31229	146	18	.	.	PUNCT
ajst-31229	147	1	adv	adv	PROPN
ajst-31229	147	2	water	water	NOUN
ajst-31229	147	3	resour	resour	NOUN
ajst-31229	147	4	.	.	PUNCT
ajst-31229	147	5	2021	2021	NUM
ajst-31229	147	6	;	;	PUNCT
ajst-31229	147	7	147:103788	147:103788	NUM
ajst-31229	147	8	.	.	PUNCT
ajst-31229	148	1	[	[	X
ajst-31229	148	2	21	21	NUM
ajst-31229	148	3	]	]	X
ajst-31229	148	4	de	de	X
ajst-31229	148	5	montserrat	montserrat	PROPN
ajst-31229	148	6	f	f	PROPN
ajst-31229	148	7	,	,	PUNCT
ajst-31229	148	8	fernandez	fernandez	PROPN
ajst-31229	148	9	c	c	PROPN
ajst-31229	148	10	,	,	PUNCT
ajst-31229	148	11	lambert	lambert	PROPN
ajst-31229	148	12	j.	j.	PROPN
ajst-31229	148	13	microbial	microbial	ADJ
ajst-31229	148	14	consumption	consumption	NOUN
ajst-31229	148	15	of	of	ADP
ajst-31229	148	16	hydrogen	hydrogen	NOUN
ajst-31229	148	17	in	in	ADP
ajst-31229	148	18	geological	geological	ADJ
ajst-31229	148	19	formations	formation	NOUN
ajst-31229	148	20	.	.	PUNCT
ajst-31229	149	1	appl	appl	PROPN
ajst-31229	149	2	environ	environ	X
ajst-31229	149	3	microbiol	microbiol	PROPN
ajst-31229	149	4	.	.	PUNCT
ajst-31229	150	1	2016;82(18):5614	2016;82(18):5614	NUM
ajst-31229	150	2	-	-	SYM
ajst-31229	150	3	5623	5623	NUM
ajst-31229	150	4	.	.	PUNCT
ajst-31229	151	1	[	[	X
ajst-31229	151	2	22	22	NUM
ajst-31229	151	3	]	]	X
ajst-31229	151	4	mayumi	mayumi	PROPN
ajst-31229	151	5	d	d	PROPN
ajst-31229	151	6	,	,	PUNCT
ajst-31229	151	7	tsunogai	tsunogai	PROPN
ajst-31229	151	8	u.	u.	PROPN
ajst-31229	151	9	methanogenesis	methanogenesis	PROPN
ajst-31229	151	10	from	from	ADP
ajst-31229	151	11	hydrogen	hydrogen	NOUN
ajst-31229	151	12	in	in	ADP
ajst-31229	151	13	subsurface	subsurface	NOUN
ajst-31229	151	14	reservoirs	reservoir	NOUN
ajst-31229	151	15	.	.	PUNCT
ajst-31229	152	1	geochim	geochim	PROPN
ajst-31229	152	2	cosmochim	cosmochim	PROPN
ajst-31229	152	3	acta	acta	PROPN
ajst-31229	152	4	.	.	PUNCT
ajst-31229	153	1	2017	2017	NUM
ajst-31229	153	2	;	;	PUNCT
ajst-31229	153	3	198:418	198:418	PROPN
ajst-31229	153	4	-	-	SYM
ajst-31229	153	5	430	430	NUM
ajst-31229	153	6	.	.	PUNCT
ajst-31229	154	1	[	[	X
ajst-31229	154	2	23	23	NUM
ajst-31229	154	3	]	]	PUNCT
ajst-31229	154	4	buss	buss	PROPN
ajst-31229	154	5	hl	hl	PROPN
ajst-31229	154	6	,	,	PUNCT
ajst-31229	154	7	maher	maher	PROPN
ajst-31229	154	8	k	k	PROPN
ajst-31229	154	9	,	,	PUNCT
ajst-31229	154	10	bargar	bargar	PROPN
ajst-31229	154	11	jr	jr	PROPN
ajst-31229	154	12	.	.	PROPN
ajst-31229	154	13	controls	control	NOUN
ajst-31229	154	14	on	on	ADP
ajst-31229	154	15	hydrogenconsuming	hydrogenconsume	VERB
ajst-31229	154	16	microbial	microbial	ADJ
ajst-31229	154	17	communities	community	NOUN
ajst-31229	154	18	in	in	ADP
ajst-31229	154	19	geologic	geologic	ADJ
ajst-31229	154	20	storage	storage	NOUN
ajst-31229	154	21	sites	site	NOUN
ajst-31229	154	22	.	.	PUNCT
ajst-31229	155	1	front	front	ADJ
ajst-31229	155	2	microbiol	microbiol	PROPN
ajst-31229	155	3	.	.	PUNCT
ajst-31229	156	1	2019;10:103	2019;10:103	NUM
ajst-31229	156	2	-	-	SYM
ajst-31229	156	3	111	111	NUM
ajst-31229	156	4	.	.	PUNCT
ajst-31229	157	1	[	[	X
ajst-31229	157	2	24	24	NUM
ajst-31229	157	3	]	]	PUNCT
ajst-31229	157	4	avant	avant	X
ajst-31229	157	5	p	p	NOUN
ajst-31229	157	6	,	,	PUNCT
ajst-31229	157	7	coolen	coolen	VERB
ajst-31229	157	8	mjl	mjl	PROPN
ajst-31229	157	9	,	,	PUNCT
ajst-31229	157	10	shuster	shuster	PROPN
ajst-31229	157	11	a.	a.	PROPN
ajst-31229	157	12	caprock	caprock	PROPN
ajst-31229	157	13	integrity	integrity	NOUN
ajst-31229	157	14	for	for	ADP
ajst-31229	157	15	underground	underground	ADJ
ajst-31229	157	16	hydrogen	hydrogen	NOUN
ajst-31229	157	17	storage	storage	NOUN
ajst-31229	157	18	.	.	PUNCT
ajst-31229	158	1	energy	energy	NOUN
ajst-31229	158	2	procedia	procedia	PROPN
ajst-31229	158	3	.	.	PUNCT
ajst-31229	158	4	2021	2021	NUM
ajst-31229	158	5	;	;	PUNCT
ajst-31229	158	6	156	156	NUM
ajst-31229	158	7	:	:	PUNCT
ajst-31229	158	8	299	299	NUM
ajst-31229	158	9	-	-	SYM
ajst-31229	158	10	304	304	NUM
ajst-31229	158	11	.	.	PUNCT
ajst-31229	159	1	[	[	X
ajst-31229	159	2	25	25	NUM
ajst-31229	159	3	]	]	PUNCT
ajst-31229	159	4	wilden	wilden	PROPN
ajst-31229	159	5	a	a	PRON
ajst-31229	159	6	,	,	PUNCT
ajst-31229	159	7	baier	baier	PROPN
ajst-31229	159	8	m	m	PROPN
ajst-31229	159	9	,	,	PUNCT
ajst-31229	159	10	kleine	kleine	PROPN
ajst-31229	159	11	d.	d.	PROPN
ajst-31229	159	12	wellbore	wellbore	NOUN
ajst-31229	159	13	integrity	integrity	NOUN
ajst-31229	159	14	for	for	ADP
ajst-31229	159	15	hydrogen	hydrogen	NOUN
ajst-31229	159	16	.	.	PUNCT
ajst-31229	160	1	spe	spe	PROPN
ajst-31229	160	2	prod	prod	PROPN
ajst-31229	160	3	oper	oper	NOUN
ajst-31229	160	4	.	.	PUNCT
ajst-31229	161	1	2020;35(3):123	2020;35(3):123	NOUN
ajst-31229	161	2	-	-	SYM
ajst-31229	161	3	134	134	NUM
ajst-31229	161	4	.	.	PUNCT