Abstract: With ideal geological volume model and the conductance mechanism of supplied electricity flow model in resistivity logging, a new method, caled lithologic analogy interpretation, of calculating water saturation was induced. Tentative practice showed that g∞od results could be obtained when applied to the logglng analysis of sand/shale sequence.

Key words: Logging, Lithologic analogy, Resistivity, Shale content, Porosity, Water saturation