Experimental Study on the Self-Healing Behavior of Fractured Rocks Induced by Water-CO₂-Rock Interactions in the Shendong Coalfield

Figure 9

Microstructures of fracture-surface primary clay minerals in sandy mudrock before and after the experiment. (a) Primary chlorite mineral crystals (before the experiment). (b) Corroded chlorite crystals (after the experiment). (c) Corroded illite crystals (after the experiment).

(a)

(b)

(c)