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在分析大庆油田常规水淹层测井评价技术、密闭及常规取心分析资料和混合流体电阻率变化规律的基础上，运用统计学方法建立了一套计算水淹层参数的数学模型，并认为大庆油田厚油层混合水电阻率是驱油效率和注入水电阻率的函数，可用一非线性Ｓ型函数来表示。利用ＤＦＰＢＦＳ最优化算法求解上述函数和广义阿尔奇公式组成的二元非线性方程组，可得出剩余油饱和度和混合水电阻率，进而评价油层的水淹程度。经处理大庆油田三口密闭取心井测井资料表明该方法效果良好。
Based on the analysis of logging evaluation techniques, confined and conventional coring analysis data and the variation of resistivity of mixed fluid in Daqing Oilfield, a set of mathematical models for calculating parameters of water flooded layer were established by using statistical method. The mixed water resistivity of the thick reservoirs in Daqing Oilfield is a function of flooding efficiency and injected water resistivity, which can be expressed by a nonlinear S-shaped function. Using the DFPBFS optimization algorithm to solve the binary nonlinear equations consisting of the above function and the generalized Archie formula, the residual oil saturation and the mixed water resistivity can be obtained, and then the water flooding degree can be evaluated. Three well-closed coring well logs in Daqing Oilfield show that the method works well.