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Abstract <br /> <br /> <br />The purpose of this report is to determine the basic rock properties <br />of porosity and permeability of the Pictured Cliffs Sandstone. Ten 3/4 <br />inch by 1-1/4 inch cores are cut from a 3 inch core sample of the Pictured <br />Cliffs Sandstone. The core sample is taken from Drill Hole No. 13B, a twin <br />to 82-5. Cores are cut parallel and perpendicular to the 3 inch core <br />barrel and to the bedding of the rock. <br />The average absolute porosity of the sample is found to be 14.67% and <br />is measured using caliper and grain density methods. The average effective <br />porosity of the sample is 14.07X measured using the mercury and Beckman <br />pycnometers. <br />The absolute permeability is measured using the Rusks Air and Liquid <br />permeameter. The permeability is measured by flowing air, water and <br />kerosene through saturated cores. In every case, the core exhibited zero <br />permeability. A grain analysis showed a high content of clay material <br />present in this rock sample. This is the most likely explanation for the <br />zero flow readings on the permeameter when testing the cores. <br />An 80 psis pressure differential was also placed across a core sample <br />using hydrogen. The flow of hydrogen through the core is undetectable, but <br />the pressure bled to 60 psis in approximately 1-1/2 hours. Thus, the core <br />does show some permeability, and it could be measured over a long period of <br /> <br />1 <br />