At the Tenth Annual Well Logging Symposium of the SPWLA in 1969, a paper was presented concerning a new well logging evaluation method developed in Hungary for the evaluation of hydrocarbon-bearing sandstones with high silt and clay content. In the present paper, principal questions relating to the determination of water saturation, hydrocarbon saturation, grain-size distribution, porosity and permeability of reservoir rocks of normal composition are investigated. Additionally, problems and possible answers concerning the determination of the electrical resistivity of fully water saturated reservoir rocks are discussed. The process for the determination of constant quantities used in the evaluation functions is also outlined. For a selected geological structure, results obtained from the practical application of the method in ten boreholes are presented. These are compared with results obtained by various other methods. Also presented are the outlines for the computer application of this new method.

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