Experimental Investigation on the Stress-Dependent Permeability of Intact and Fractured Shale

Table 2

Design of experiments.

	Samples	Test type	Confining pressure (MPa)	Pore pressure (MPa)
Intact shale	KJ1	Basic case	30	2, 4, 6, 8, 10, 12, 14, 16, 18, 20
	KJ1	Low pore pressure	10, 15, 20, 25, 30	2, 4, 6
	KJ1, KJ2	High pore pressure	30, 35, 40	8, 12, 16, 20, 24
Fractured shale	KJ3, KJ4	High pore pressure	30, 35, 40	8, 12, 16, 20, 24