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The Correlation Of Capillary Pressure And Electric Log Data
Well logs are used extensively for formation evaluation purposes when other data is not readily available. In using the classical Archie equation (Reference 1), it is necessary to have an accurate value of the saturation exponent if a reasonable estimate of the connate water saturation is to be obtained. By correlating capillary pressure data and log-derived connate water saturations from the same formations, it is possible to obtain a more accurate value of the saturation exponent. Rather than using the capillary pressure data for correlation purposes, a quantity described as the "J" function is used (Reference 2). Examples correlating these data are presented for wells in Beaver and Seminole Counties, Oklahoma, and in Pope County, Arkansas. Revised saturation exponents are determined as a result of these correlations which permit more exacting log analyses of the producing formations studies.
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