Based on testing in Mahe gas field and time-lapse logging data, the method of resistivity correction for formations with mud invasion was proposed by integrating time-lapse logging with the step model. Firstly, the dual laterolog data for the testing intervals soaked for 5 days were corrected using the step model. Secondly, by taking oil-bearing properties, petophysics and C_mf /C_w into account, the statistical analysis of corrected resistivity and deep-laterolog resistivity of the drilled well, and the corresponding correction coefficients were determined. Finally,4 wells were corrected in Mahe gas field. The results showed that water saturation calculated using resistivity corrected by the method perfectly matched that of pressure coring. The gas saturation for the gas interval was increased by 13%, and gas saturation parameters were more accurate after salt mud invasion correction and the parameters could be used to calculate oil reserve.