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

Table 1

Porosity, total organic carbon content (TOC), vitrinite reflectance (VRr), and mineral composition (XRD meas.) for the samples used in this study.

Sample	Porosity^1	TOC	VRr	Q+F	Clays	XCO3	Other
	(%)	(wt.%)	(%)	(wt.% of mineral phases)
Alum^1	14.5	8.2	0.5	57.2	32.7	0.2	9.9
Bazhenov	7.3	6.0	1.5	65.5	29.0	2.5	3.0
Eagle Ford^2	11.7	4.5	0.9	26.3	8.1	62.3	3.3
Kimmeridge	6.9	45.0	0.5	9.6	45.5	12.1	32.8^2

¹Measured by He pycnometry on unconfined sample plugs. ²[32.8]: 11.17 wt.% pyrite, 10.67 wt.% anhydrite, and 10.92 wt.% gypsum. Geochemical and mineralogical data from ¹Ghanizadeh et al. [23] and ²Gasparik et al. [24]. Q+F: quartz+feldspar; clays: kaolinite, mixed layered I/S; XCO₃: mostly calcite, minor contributions of dolomite or siderite; other: mostly pyrite, minor contributions of gypsum and anhydrite.