id	keyword
gc-723	factor
gc-723	scores
gc-723	hydrocarbon
gc-723	soil
gc-723	components
gc-723	fig
gc-723	analysis
gc-723	surface
gc-723	gas
gc-723	data
gc-723	probability
gc-723	model
gc-723	map
gc-723	simulation
gc-723	variance
gc-723	process
gc-723	factor scores
gc-723	reservoirs
gc-723	distribution
gc-723	migration