A Comparative Study on Fracture Characteristics of the Red Sandstone under Water and Nitrogen Gas Fracturing

Figure 14

Plots of pore pressure distribution during fracturing (I). (a) W1, (b) G1, (c) W2, (d) G2, (e) W3, and (f) G3.

(a)

(b)

(c)

(d)

(e)

(f)