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

Table 2

The fitting parameters in the mathematical models describing the relationship between permeability and injection pressure.

Sample	Cycle	Process
S1	1	Loading	0.117	0.031	0.9946
		Unloading	0.137	0.023	0.9971
	2	Loading	0.116	0.030	0.9964
		Unloading	0.135	0.022	0.9987
	3	Loading	0.120	0.029	0.9961
		Unloading	0.137	0.022	0.9990
S2	1	Loading	0.116	0.035	0.9998
		Unloading	0.148	0.022	0.9988
	2	Loading	0.128	0.032	0.9988
		Unloading	0.154	0.021	0.9998
	3	Loading	0.127	0.031	0.9994
		Unloading	0.157	0.020	0.9986