Experimental Investigation of the Dependence of Accessible Porosity and Methane Sorption Capacity of Carbonaceous Shales on Particle Size

Table 2

Methane excess sorption capacity at 10 MPa pore pressure () and fitted parameters for the Langmuir function (Equation (7)) for all samples and particle sizes.

Sample	Particle size		Langmuir parameters (Equation (7))
			(mm)	(mmol g^-1)	(mmol g^-1)	(MPa)
	Alum Shale (8.2% TOC)	Plug	0.105	0.145	3.87
>10		0.103	0.141	3.70
<2		0.104	0.139	3.27
<0.063		0.131	0.185	4.13
<0.001		0.150	0.182	2.18
Bazhenov (6.0% TOC)	Plug	0.058	0.076	3.16
	>10	0.071	0.095	3.44
	<2	0.077	0.105	3.73
	<0.063	0.078	0.111	4.22
	<0.001	0.131	0.193	4.69
Eagle Ford (4.5% TOC)	Plug	0.035	0.052	4.99
	>10	0.030	0.043	4.52
	<2	0.034	0.048	4.23
	<0.063	0.030	0.036	1.98
	<0.001	0.030	0.038	2.54
Kimmeridge (45% TOC)	Plug	0.281	0.355	2.63
	>10	0.282	0.357	2.63
	<2	0.287	0.350	2.20
	<0.063	0.287	0.368	2.80
	<0.001	0.355	0.448	2.61