Paleoenvironment, Geochemistry, and Pore Characteristics of the Postmature to Overmature Organic-Rich Devonian Shales in Guizhong Depression, Southwestern China

Table 3

TOC, , mineral composition, and pore structure parameters of the studied samples from GY-1 well.

Formation	Depth (m)	TOC (%)	(%)	Porosity (%)	Total rock XRD									BET surface area(m^2/g)	BJH pore volume(ml/g)
					Clay (%)	Quartz (%)	Potash feldspar (%)	Plagioclase (%)	Calcite (%)	Dolomite (%)	Siderite (%)	Anhydrite (%)	Pyrite (%)
	231	2.07	3.62	3.29	8	35			55				2	7.245	0.009
	255	5.37	3.55	4.4	14	65			16	3			2	13.640	0.017
	475	1.49	3.4	2.59	40	36	1	3	2	11	2	2	3	4.376	0.0066
	495	0.7	3.48	1.2	35	27		2	2	30	2	1	1	2.385	0.0036
	579	1.72	3.5	1.81	48	23		2	4	18	2	1	2	4.949	0.0078
	595	3.85	3.58	1.52	40	31		2	17	5	2	1	2	14.215	0.0168
	639	2.67	3.67	1.41	45	37	1	3	1	7	2	1	3	8.880	0.01129
	651	3.07	3.68	2.59	41	40		2	8	5	1	1	2	7.615	0.011
	739	3.05	3.7	4.49	39	39		2	3	12		1	4	7.580	0.0096
	795	2.78	3.76	2.88	43	38	1	2	9	1	1	1	4	10.030	0.0124