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根据ЭКОС-31-7过套管电阻率测井仪的测井原理和数值模拟方法,考察了水泥环以及层厚/围岩对测量结果的影响,并给出了影响校正方法。基于并联导电理论以及HB电阻率方程,建立了改进混合泥质砂岩的泥质导电电阻率模型,利用二分法求取地层的含水饱和度。通过4口取心井的验证,表明测井资料解释方法可行,解释结果可靠。在9口措施井中,其中7口井见到很好的增油降水效果。理论计算及现场试验结果表明,俄罗斯的ЭКОС-31-7过套管电阻率测井仪器能够满足厚度大于1.0 m储层的剩余油评价和动用状况监测问题,在大庆油田具有较好的推广应用前景。
According to the logging principle and numerical simulation method of ЭКОС-31-7 Cased-Hole Resistivity Logging Tool, the influence of cement ring and layer thickness / surrounding rock on the measurement results is investigated and the influence correction method is given. Based on the parallel conduction theory and the HB resistivity equation, the mud resistivity model of mixed shaly sandstone was established. The dichotomy was used to determine the water saturation of the formation. Through the verification of 4 cored wells, it shows that the logging data interpretation method is feasible and the interpretation result is reliable. Among the 9 measures wells, 7 wells saw good oil precipitation enhancement effect. The theoretical calculation and field test results show that the Russian ЭКОС-31-7 over-cased resistivity logging instrument can meet the needs of residual oil evaluation and utilization monitoring in reservoirs with thicknesses greater than 1.0 m, and has good popularization and application in Daqing Oilfield prospect.