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Figure 4-2. Shapes of mercury-injection curves (MICP) of four shale types indicate that they represent three classes of pore structure. A. Curves for shale types 4 and 5. B. Curves for shale type 3. C. Curves for shale type 2. D. Graphs of mercury-injection curves (MICP) at 10% nonwetting saturation (PSIA) for shale types 2, 3, and 4.