Reservoir Characteristics and Gas Content of Black Shale of Wufeng-Longmaxi Formation in Qianjiang Area, Southeast Chongqing, China

Table 1

Statistics of lithofacies characteristics of black shale in Wufeng-Longmaxi Formation in Qianjiang area.

Well	Formation	Sapropelite (%)	Chitinite (%)	Vitrinite (%)	Inertinite (%)	TI	Organic matter type
ZY1	O3w-S1l	54.9~97.13	0	2.87~45.4	0	9.2~94.26	I-II1
		85.64 (7)		1.63 (7)		71.29 (7)
QD1	O3w-S1l	95~98	0	1~3	1~3	90.50~96.25	I
		96.75 (7)		1.63 (7)	1.63 (7)	93.91 (7)
QD2	O3w-S1l	94~98	0	1~3	1~3	88.75~96.25	I
		96.24 (17)		2.0 (17)	1.76 (17)	92.97 (17)
YC8	O3w-S1l	80~95	0	2~8	2~15	61.25~90.5	I-II1
		88.15 (13)		5.0 (13)	6.85 (13)	77.56 (13)

Note: when kerogen maceral analysis is used to classify kerogen types, weighted type index TI value is used to determine the kerogen types, namely, , where , , , and represent the percentage of sapropelite, chitinite, vitrinite, and inertinite, respectively.