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

Table 4

Measured pore structure parameters of the rock samples before and after the experiments.

Parameter	S1			S2
	Initial	Final	Relative change	Initial	Final	Relative change
Surface area (m^2/g)	1.7300	2.5343	46.49%	1.5636	2.3428	49.83%
Total pore volume (mL/g)	0.0083	0.0082	−1.20%	0.0079	0.0076	−3.80%
Micropores volume (mL/g)	0.0006	0.0010	66.67%	0.0006	0.0009	50.00%
Average pore size (nm)	19.19	12.94	−32.57%	20.21	12.98	−35.77%
Most probable pore size (nm)	2.59	2.59	0	2.60	2.60	0