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

Figure 6

Secondary minerals adhering to the primary minerals at the fracture surface in the coarse-grained sandrock specimen. (a) Secondary kaolinite adhering to the quartz crystals after the experiment. (b) Primary kaolinite. (c) EDS analysis in the No. 1 box of Figure 6(a). (d) EDS analysis in the No. 2 box of Figure 6(a). (e) EDS analysis in the box of Figure 6(b).

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