Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties

Figure 5

Gradual-cracking process and permeability behavior considering different confining pressure and water pressure.

(a) Sandstone without mud (water pressure 3 MPa + confining pressure 6 MPa)

(b) Sandstone with mud (water pressure 3 MPa + confining pressure 6 MPa)

(c) Sandstone without mud (water pressure 4 MPa + confining pressure 6 MPa)

(d) Sandstone with mud (water pressure 4 MPa + confining pressure 6 MPa)

(e) Sandstone without mud (water pressure 3 MPa + confining pressure 15 MPa)

(f) Sandstone with mud (water pressure 3 MPa + confining pressure 15 MPa)

(g) Sandstone without mud (water pressure 4 MPa + confining pressure 15 MPa)

(h) Sandstone with mud (water pressure 4 MPa + confining pressure 15 MPa)