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

Table 3

Apparent grain densities and computed porosities as a function of particle size.

Sample	Particle size	Bulk density	Apparent grain density	Porosity
	(mm)	(g cm^-3)	(g cm^-3)	(-)
Alum	Plug^1	2.021	2.363	0.145
	>10		2.360	0.143
	<2		2.362	0.144
	<0.063		2.385	0.152
	<0.001		2.387	0.153
	<0.001		2.421^3	0.165^3
Bazhenov	Plug^2	2.257	2.435	0.073
	>10		2.442	0.076
	<2		2.447	0.077
	<0.063		2.446	0.077
	<0.001		2.450	0.079
	<0.001		2.467^3	0.085^3
Eagle Ford	Plug^1	2.148	2.433	0.117
	>10		2.426	0.115
	<2		2.433	0.117
	<0.063		2.431	0.116
	<0.001		2.431	0.116
	<0.001		2.494^3	0.139^3
Kimmeridge	Plug^1	1.437	1.544	0.070
	>10		1.544	0.070
	<2		1.546	0.070
	<0.063		1.546	0.071
	<0.001		1.552	0.074
	<0.001		1.533^3	0.062^3

¹Plug with 38 mm diameter. ²Plug with 30 mm diameter. ³Grain densities and porosities calculated from XRD data with assumed org. matter ∙TOC wt.% and organic matter density: 1.15 g cm^-3.