Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S.

Table 2

Micropore and macropore volumes and surface areas obtained by CO₂ gas adsorption and mercury intrusion capillary pressure (MICP) in Wufeng-Longmaxi shale. The total organic carbon content is also listed in the second column from the left side.

Sample ID	Total organic carbon (TOC) content (wt. %)	Pore volume (cm^3/g)		Specific surface area (m^2/g)
		Micropore	Macropore	Micropore	Macropore
N2	0.96	0.00110	0.0057	3.773	0.023
N3	0.89	0.00114	0.0053	4.084	0.025
N4	1.07	0.00127	0.0050	4.476	0.021
N5	1.31	0.00101	0.0053	3.604	0.014
N8	2.98	0.00238	0.0145	8.379	0.020
N9	3.39	0.00285	0.0056	9.887	0.027
N10	3.52	0.00187	0.0071	6.102	0.010