Characteristics of Organic Matter Pores and the Relationship with Current Pressure System of Lower Silurian Longmaxi Shales in Dingshan Field, Southern Sichuan, China

Table 1

Porosities and mineral contents of samples.

No.	Depth (m)	Formation	TOC (%)	Mineral contents (%)
				Clay	Quartz	Feldspar	Calcite	Dolomite	Pyrite	Anhydrite	Siderite
D1	2155.02	Longmaxi shales	4.68	21.89	55.33	4.56	4.44	6.56	5.33	1.71	1.00
D2	4398.00	Longmaxi shales	4.17	34.96	39.94	5.05	8.25	7.74	3.79	0.27	/
D3	2413.90	Longmaxi shales	4.73	29.33	51.84	6.02	3.18	7.54	2.09	/	/
D4	3965.74	Longmaxi shales	4.26	40.24	39.93	7.23	4.65	5.19	2.76	/	0.27
D5	4018.70	Longmaxi shales	3.79	37.33	38.62	5.46	3.35	7.89	6.41	/	1.14
D6	3447.17	Longmaxi shales	4.43	28.34	51.10	4.37	4.53	5.98	4.51	0.36	0.58
D7	4257.00	Longmaxi shales	3.90	32.32	41.13	3.15	11.11	5.89	4.77	0.36	0.49