Experimental Study on the Effects of Stress Variations on the Permeability of Feldspar-Quartz Sandstone

Table 3

Fitting parameters in the mathematical models of permeability and confining pressure.

Sample	Cycle	Process
S1	1	Loading	0.128	−0.182	0.9860
		Unloading	0.086	−0.049	0.9671
	2	Loading	0.092	−0.083	0.9968
		Unloading	0.085	−0.060	0.9749
	3	Loading	0.085	−0.064	0.9765
		Unloading	0.080	−0.042	0.9219
S2	1	Loading	0.169	−0.208	0.9621
		Unloading	0.106	−0.046	0.9935
	2	Loading	0.115	−0.089	0.9969
		Unloading	0.106	−0.064	0.9913
	3	Loading	0.110	−0.084	0.9943
		Unloading	0.101	−0.057	0.9817