Figure F2. Plot of 100 x (PORC-PORM)/PORM vs. PORM, where PORC = porosity using plug volume measured by caliper and PORM = porosity using plug volume measured by mercury displacement. The value 100 x (PORC – PORM)/PORM represents the percentage of PORM by which the PORC value exceeds PORM. The value of 7% (horizontal line) is judged to be a suitable approximation of the average correction necessary to increase PORM of the "control" samples (plugs selected with apparently regular cylindrical shape) to best match PORC. "Control" plugs selected for good cylindrical shape are represented by solid squares.

Figure F2. Plot of 100 x (PORC-PORM)/PORM vs. PORM, where PORC = porosity using plug volume measured by caliper and PORM = porosity using plug volume measured by mercury displacement. The value 100 x (PORC – PORM)/PORM represents the percentage of PORM by which the PORC value exceeds PORM. The value of 7% (horizontal line) is judged to be a suitable approximation of the average correction necessary to increase PORM of the "control" samples (plugs selected with apparently regular cylindrical shape) to best match PORC. "Control" plugs selected for good cylindrical shape are represented by solid squares.