Influence of Overlying Caprock on Coalbed Methane Migration in the Xutuan Coal Mine, Huaibei Coalfield, China: A Conceptional Analysis on Caprock Sealability

Table 1

Proximate analysis and adsorption constant of coal samples.

Sample	Proximate analysis (wt.%)				Adsorption constant
	Moisture	Ash	Volatile matter	Fixed carbon	(m^3/t)	(MPa)
XT-1	1.219	18.05	22.145	58.586	24.4684	1.6005
XT-2	1.105	15.52	20.6	62.775	24.1749	1.7733
XT-3	1.165	16.115	21.725	60.995	23.9867	1.6977
XT-4	1.043	15.865	23.17	59.922	23.8853	1.7021