Micropore Structure and Fractal Characteristics of Low-Permeability Coal Seams

Table 3

Specific surface area, pore volume, and pore size of raw coal samples.

Coal sample	Average pore diameter (nm)	Cumulative pore volume (cm^3·g^−1)	Cumulative specific surface area (m^2·g^−1)	Pore volume/specific surface area ratio of different pore size segments (%)
				Macropore (>50)	Mesopore (2∼50)
B-1	29.2002	0.000589	0.0807	38.71/38.22	61.29/61.78
B-2	31.7096	0.000938	0.1183	34.12/50.14	65.88/49.86
B-3	10.3268	0.008605	3.3331	24.22/5.92	75.78/94.08
B-4	26.7596	0.001153	0.1724	40/34.51	60/65.49
B-5	32.7034	0.00083	0.1015	48.55/47.03	51.45/52.97
B-6	21.6436	0.003718	0.6871	17.59/20.12	82.41/79.88