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An induced fracture, note the lip on the disc fracture at the outer core surface, indicating interaction between the disc plane and the free surface, and that discing formed after the core was cut. Note also the rim of mud invasion next to the core surface, indicating that the mud coating on the core was still wet and mobile at the time of discing. Vertical, 4-inch diameter core; uphole is towards the viewer.
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An induced fracture, note the lip on the disc fracture at the outer core surface, indicating interaction between the disc plane and the free surface, and that discing formed after the core was cut. Note also the rim of mud invasion next to the core surface, indicating that the mud coating on the core was still wet and mobile at the time of discing. Vertical, 4-inch diameter core; uphole is towards the viewer.