Effect of Fluid/Rock Interactions on Physical Character of Tight Sandstone Reservoirs during CO₂ Flooding

Figure 14

SEM pictures of rocks before and after interactions with CO₂, no scale-forming ions water.

(a) Before reaction

(b) After reaction under pressure of 10 MPa

(c) After reaction under the pressure of 13 MPa

(d) After reaction under the pressure of 15 MPa