- The following primary drainage capillary pressure is measured in the laboratory using mercury. The core has a permeability of 5.92 1013m2, a porosity of 0.20 , its interfacial tension is 480mN/m, and contact angle is 40. - In an oil reservoir, some parameters were measured. The average permeability is 1.971013m2, the porosity is 0.15 , the interfacial tension is 25mN/m, and the contact angle is 0. Plot a graph of water saturation against height above the free water level in the reservoir