Experimental Study on Reasonable Adsorption Time in Determination Coalbed Methane Content

Table 3

Pore size parameters of coal samples.

Coal samples	Pore type	Pore size (nm)	Pore volume (mL/g)	Pore volume percentage (%)	Total pore volume (mL/g)	Porosity (%)
WYY	Visible pore	>100000	0.0713	69.16%	0.1031	81%
	Macropore	1000-100000	0.0133	12.90%
	Mesopore	100-1000	0.0019	1.84%
	Minipore	10-100	0.0086	8.34%
	Micropore	5.5-10	0.0080	7.76%
WYR	Visible pore	>100000	0.0159	22.59%	0.0704	52%
	Macropore	1000-100000	0.0152	21.59%
	Mesopore	100-1000	0.0135	19.18%
	Minipore	10-100	0.0149	21.16%
	Micropore	5.5-10	0.0109	15.48%
PY	Visible pore	>100000	0.0486	61.68%	0.0788	67%
	Macropore	1000-100000	0.0101	12.82%
	Mesopore	100-1000	0.0018	2.29%
	Minipore	10-100	0.0088	11.17%
	Micropore	5.5-10	0.0095	12.06%
PR	Visible pore	>100000	0.0119	21.83%	0.0545	46%
	Macropore	1000-100000	0.0086	15.78%
	Mesopore	100-1000	0.0112	20.55%
	Minipore	10-100	0.0139	25.50%
	Micropore	5.5-10	0.0089	16.33%
QFY	Visible pore	>100000	0.0177	31.33%	0.0565	45%
	Macropore	1000-100000	0.0107	18.94%
	Mesopore	100-1000	0.0094	16.64%
	Minipore	10-100	0.0104	18.41%
	Micropore	5.5-10	0.0083	14.69%
QFR	Visible pore	>100000	0.0162	31.89%	0.0508	42%
	Macropore	1000-100000	0.0117	23.03%
	Mesopore	100-1000	0.0054	10.63%
	Minipore	10-100	0.0092	18.11%
	Micropore	5.5-10	0.0083	16.34%