id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ajst-29945	Zhai, Wenbin; Fan, Siya	Lithological characteristics and logging identification methods of the Chang73 menber in Jiyuan area, Ordos Basin	2025	7	.pdf	application/pdf	4320	219	49	Logging values of different lithology in the subfacies of deep lake and semi deep lake lithology AC/(μs/m) CNL/% GR/API DEN/(g/cm3) shale 366.8~268.1 314.6 79.6~25.2 41.7 422.9~137.4 241.3 2.5~1.9 2.3 mudstone 321.3~246.7 288.5 45.7~20.6 36.4 247.2~110.9 160.1 2.6~2.4 2.5 argillaceous siltstone 245.9~210.0 222.5 28.7~16.7 19.5 140.1~88.9 117.2 2.7~2.4 2.6 silty mudsone 237.9~205.2 219.4 27.6~16.4 21.2 123.6~84.1 102.2 2.7~2.4 2.6 siltstone 222.6~203.5 215.8 25.3~13.7 20.5 121.4~72.0 98.5 2..7~2.5 2.6 fine sandstone 230.3~188.3 207.2 26.8~12.9 18.2 121.8~55.5 85.3 2.7~2.5 2.6 Note: The meaning of fractions in the table max~min average Based on previous research[16-19], this article believes that there are four main reasons for the differences in logging values of different sedimentary facies lithology: firstly, the clay particles that make up the mud have a larger specific surface area, which can adsorb more ions of radioactive elements during the sedimentation process. Logging responses of black shale include: High natural gamma (180- 330 API) and acoustic moveout values (280-340 μs/m), Low density (2.2-2.4 g/cm ³ ), Negative spontaneous potential anomalies (Table 1). 3.2.	cache/ajst-29945.pdf	txt/ajst-29945.txt