The Influence of Injected Fluids on Microscopic Pore Structures in the Intersalt Dolomitic Shale Oil Reservoirs

Figure 6

Microscopic pore structure changes before and after the interaction of different fluids. (a) Pores of muddy dolomite are increased, and salt minerals migrate (supercritical CO₂). (b) Salt minerals are dissolved (distilled water). (c) Clay mineral expansion occurs (distilled water). (d) Pores are dissolved, causing caves (supercritical CO₂ saturated solution). (e) Dolomite particles are dissolved, causing dissolved pores (supercritical CO₂ saturated solution). (f) Clay is released, and particle migration occurs (supercritical CO₂ saturated solution).

(a)

(b)

(c)

(d)

(e)

(f)