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自然电位是地层在无外界极化状态下由于电化学反应产生的电位 ,其大小主要取决于地层水离子浓度和阳离子交换量。利用激发极化测井的自然电位曲线和极化率曲线 ,可以逐层计算出地层阳离子交换量及地层水离子浓度 ,从而可以求解地层水电阻率 ,应用W -S模型计算泥质砂岩储层的含油饱和度。冀东油田通过进行大量的岩芯测试 ,采用最优化方法 ,取得了适合于本区地质解释的待定参数值。实际勘探结果证实 ,冀东油田的电化学测井解释模式与实际地质情况基本一致
The natural potential is the potential of the formation due to electrochemical reaction in the absence of external polarization. The size of the potential is mainly determined by the formation water ion concentration and the cation exchange capacity. Using the natural potential curve and the polarization curve of the induced polarization logging, the formation cation exchange capacity and the formation water ion concentration can be calculated layer by layer so that the formation water resistivity can be solved. The W-S model can be used to calculate the shale sandstone reservoir Oil saturation. Jidong Oilfield through a large number of core tests, using the optimization method, obtained for the interpretation of the geological parameters to be determined parameters. The actual exploration results confirm that the electrochemical logging interpretation model in Jidong Oilfield basically agrees with the actual geological conditions