Pore Structure and Multifractal Characteristics of Overmature Continental Shale: A Case Study from the Xujiaweizi Fault Depression, Songliao Basin, China

Table 2

Mineral compositions of shale samples.

Sample	Brittle mineral/%					Clay mineral/%
	Q	O	F	C	Total	I	I/S	K	Ch	S%	Cl
DS6-6	39.17	0.00	9.20	0.00	48.36	36.74	56.12	0.00	7.13	14.54	51.14
DS6-17	34.59	0.00	19.29	1.25	53.88	40.10	51.38	0.00	8.52	10.71	44.87
DS28-11	39.38	0.00	14.02	0.00	53.41	14.81	71.11	2.45	11.63	23.32	46.59
DS28-15	28.35	0.00	17.95	0.00	46.30	10.15	78.15	2.27	9.44	31.18	53.37
ShS5-16	31.28	2.79	17.28	0.00	51.34	37.00	56.61	0.00	6.39	11.49	48.66
XS25-2	58.89	0.00	0.00	0.91	59.79	24.39	68.05	1.11	6.45	17.25	40.21
XS25-5	31.50	0.00	10.67	0.00	42.17	23.06	71.88	0.00	5.06	16.52	57.83
XS25-6	39.92	0.00	7.70	0.00	40.62	16.57	80.90	0.00	2.53	21.27	58.69
XS25-12	34.58	0.00	11.29	0.00	45.87	24.69	68.54	0.00	6.78	15.53	54.13
ZS14-5	32.19	0.00	7.83	0.00	40.02	65.18	24.17	0.00	10.65	15.53	49.91

Q, O, F, and C are the quartz, orthoclase, feldspar, and calcite, respectively; I, I/S, K, Ch, and CL are the illite, illite-smectite, kaolinite, chlorite, and clay mineral, respectively.