Evaluation of Coal Pore Connectivity Using N₂ Sorption Isotherm and Spontaneous Imbibition Tests

Table 1

Pore parameters of six coal samples measured by N₂ adsorption.

Types of coal	Total specific surface area (m^2/g)	Total pore volume (mm^3/g)	Average pore diameter (nm)	Pore volume (mm3/g)			Pore volume ratio (%)
				<10	10-100	>100	<10	10-100	>100
Changcun	1.327	3.056	7.07	1.77	0.65	0.636	57.9	21.3	20.8
Yuwu	1.266	3.441	13.92	1.86	0.89	0.691	54.1	26.1	19.8
Dongxia	2.831	10.94	17.81	2.02	4.10	4.82	18.5	37.5	44.0
Gengcun	0.464	3.671	31.63	0.71	1.78	1.181	19.3	48.5	32.2
Yanbei	0.302	1.782	23.58	0.54	0.64	0.602	30.3	35.9	33.8
Yangcun	3.275	7.386	9.02	3.49	1.17	2.726	47.3	15.8	36.9