Nanoscale Pore Structure Characterization and Permeability of Mudrocks and Fine-Grained Sandstones in Coal Reservoirs by Scanning Electron Microscopy, Mercury Intrusion Porosimetry, and Low-Field Nuclear Magnetic Resonance

Table 4

Parameters of pore-system structure measured by MIP.

Sample number	Porosity (%)	Total pore volume (mL/g)	Total pore area (m^2/g)	Median pore diameter (nm)	Average pore diameter (nm)	Bulk density (g/mL)	Apparent (skeletal) density (g/mL)
JH-Y	1.86	0.007	0.83	6.90	35.50	2.52	2.57
JH-S	2.92	0.012	1.61	8.60	28.60	2.53	2.61
NT-Y1	6.16	0.023	5.65	11.40	16.10	2.71	2.89
NT-Y2	8.38	0.036	6.68	14.00	21.30	2.36	2.58
NT-Y3	7.58	0.032	12.17	6.70	10.30	2.41	2.61
NT-M1	7.05	0.029	11.62	6.70	10.00	2.42	2.61
NT-M2	8.06	0.033	10.12	9.85	13.20	2.44	2.65
NT-M3	10.26	0.043	11.10	11.90	15.60	2.37	2.64
NT-M4	7.30	0.030	10.36	8.10	11.60	2.43	2.62
NT-M5	8.05	0.034	9.75	10.30	13.70	2.40	2.61
NT-M6	8.68	0.036	11.27	9.30	12.80	2.41	2.64
NT-S	15.26	0.069	1.20	64.00	230.40	2.21	2.61