Study on Postfrac Softening Mechanism of Deep Marine Shale Reservoir in South Sichuan Basin

Figure 6

Analysis of shale softening mechanism. (a) Mineral content distribution of wells. (b) Brinell hardness change after shale is immersed in liquids. (c) Daily decrease rate of Brinell hardness of shale immersed in different liquids.

(a)

(b)

(c)