Abstract

Determination of hydrocarbon saturation in fresh water fluvial reservoirs has long been a challenge because of the complexities of the electrical conductance mechanism varying in the range from Archie, non-Archie to a severely non-Archie behavior of electrical conduction where conventional shaly sand equations breaks down. Accordingly, Archie, shaly sand and pseudo-Archie methods applied for precise computation of water saturation in these reservoirs. The only practical means at present of obtaining the realistic values of Archie parameters is by using tedious, expensive, and timeconsuming core measurements with very high sampling rate. There has been doubts about the validity of the computed constant values from such core measurements, as these measurements do not reproduce down hole conditions particularly in heterogeneous reservoirs with continuous textural variations