Lower Cambrian Organic-Rich Shales in Southern China: A Review of Gas-Bearing Property, Pore Structure, and Their Controlling Factors

Table 3

Pore structure parameters of the Lower Paleozoic shales in southern China (see Figure 2 for well locations).

Regions	Formation	Well	Buried depth (m)	Number of samples	Specific surface area (m^2/g); Range/Average	Total pore volume (mL/g); Range/Average	Porosity (%); Range/Average	References
Sichuan Basin	Wufeng-Longmaxi Fm.	N203	2170-2393	28	7.3-31.8/14.92	0.03-0.06/0.050	1.46-8.22/4.72	[96]
	Wufeng-Longmaxi Fm.	W201	1490-1552	6	6.2-20.2/14.00	0.03-0.07/0.047	3.79-6.75/5.96
	Longmaxi Fm.	JY1	2288-2357	10	14.3-32.1/23.30	0.02-0.03/0.024	3.66-5.65/4.68	[126]
	Longmaxi Fm.	JY2	2552-2607	6	18.9-25.9/23.84	0.02-0.024/0.022	3.43-4.73/4.17
	Qiongzhusi Fm.	W201	2705-2816	9	2.3-10.8/5.90	0.01-0.04/0.028	1.62-2.17/1.85	[96]
	Qiongzhusi Fm.	N206	1830-1887	9	4.5-9.6/7.64	0.03-0.04/0.038	0.47-2.57/1.52
	Qiongzhusi Fm.	B1	2819-2977	9	3.9-7.0/5.14	0.02-0.03/0.028	1.50-1.87/1.64
	Qiongzhusi Fm.	YS106	3260-3380	7	2.0-3.4/2.64	0.01-0.03/0.020	0.88-2.13/1.48
Western Hubei	Shuijingtuo Fm.	YY1	1809-1871	6	7.2-18.2/14.00	0.01-0.04/0.025	0.96-3.33/2.08	[44]
Northwestern Hunan	Niutitang Fm.	CY1	795-1334	7	0.8-7.4/3.00	0.001-0.01/0.005	1.20-1.80/1.50	[21]
Northern Guizhou	Niutitang Fm.	TM1	1430-1457	4	10.6-15.2/12.80	0.008-0.01/0.010	nd	[127]
	Niutitang Fm.	CY1	1418-1440	4	8.3-13.3/11.43	0.004-0.02/0.008	nd
Southern Anhui	Hetang Fm.	XY1	nd	15	4.3-7.5	0.006-0.012	0.30-2.82/1.47	[24]

Note: “nd” means not detected.