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Title: Studies Of Front-End Threshold Pressure Measurements
Author: G. N. Pandey, m. Rasin Tek, Donald L. Katz
Source: American Gas Association 1973
Year Published: 1973
Abstract: Continued studies on threshold pressure of caprocks were made beyond the A.G.A. monograph using gas pressure measurements at the front end of the core to detect the threshold event. A new technique was devised which consists of placing a limited supply of gas at the front of the core under high pressure followed by pressure reduction to a level value equal to the threshold pressure. In this technique, the gas-water interface is moved a short distance into the core, with the displacement arrested due (o the limited supply of the displacing fluid at a pressure differential high enough to overcome (he threshold pressure. Auxiliary measurements were made using a liquid hydrocarbon as the displacing fluid. Radioactive photography was used to show the arrested gas-water interface. The heterogeneous character of the caprocks were photographed on a scanning electron microscope.

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