The purpose of this study is to establish the water saturation estimation model (called MCRMM) for a conductive formation and to use the optimization technology to get the regional Archie parameters (tortuosity (a), cementation exponent (m), and saturation exponent (n)) and conductive formation parameter (b') of X-field. In this study, the optimum regional empirical parameters including the tortuosity (a), cementation exponent (m), saturation exponent (n), and conductive formation parameter (b') in M-formation of X-field are determined from the G-I well and G-2 well core data and optimization analysis, Our results show that the estimated water saturation from the MCRMM model (combined with the regional empirical parameters by optimization analysis) was the optimum.