Mechanical-Chemical-Mineralogical Controls on Permeability Evolution of Shale Fractures

Figure 10

SEM images and corresponding EDS images of the fracture surface (window 1) after core flooding tests under various fluid pH when confining stress is 10 MPa. (a) Longmaxi shale, (b) Green River shale, and (c) Marcellus shale.

(a)

(b)

(c)