Experimental Study on the Stress Sensitivity and Influence Factors of Shale under Varying Stress
Table 2
Statistic analysis results of the relationships of the porosity and permeability of shale with the effective stress.
Sample ID
Compressibility m/MPa−1
Porosity /%
Coefficient n/MPa−1
Permeability K0/10−3µm2
1
0.1093
2.3858
0.9643
0.08664
0.00768
0.9724
2
0.1457
2.6589
0.9341
0.12223
0.00758
0.9838
3
0.1586
3.0753
0.9298
0.11981
0.00990
0.9705
4
0.1720
3.1822
0.9133
0.12013
0.01023
0.9689
5
0.2814
3.6318
0.9987
0.10271
0.00671
0.9615
Maximum value
0.2814
3.6318
0.9987
0.12223
0.01023
0.9838
Minimum value
0.1093
2.3858
0.9133
0.08664
0.00671
0.9615
Average value
0.1734
2.9868
0.9480
0.11030
0.00842
0.9714
is the correlation coefficient of the porosity and effective stress of shale; is the correlation coefficient of the permeability and effective stress of shale.
