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Four-parameters method, morphologic method of total hydrocarbon curves and coefficient method of reservoir thickness of total hydrocarbon were used to solve the problems of gas logging low in abnormallity and in-complete in components in Jilin prospecting area. The author established reservoir evaluation method with oil saturation by geochemical logging, NMR porosity and chromatographic oiliness, and solved the difficult problems in evaluation on low permeability and resistivity reservoirs.