Pore Structure Alteration Characteristics of Different Mineralogical Composition Shale during Shale-Fracturing Fluid Physical-Chemical Interactions

Figure 7

Pore size distributions (a, c) and pore volume values (b, d) for each type of pores for the raw and treated shale samples: (a, b) YY; (c, d) GZ.

(a)

(b)

(c)

(d)