冀东油田电化学测井解释模型的建立及应用

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。

ESTABLISHMENT AND APPLICATION OF INTERPRETATION MODEL FOR ELECTROCHEMICAL LOG IN JHDONG OILFIELD

Spontaneous potential is the potential resulted from formation's electrochemical reaction under non polorization state,and its scale is determined by the density of formation water ions and the cation exchange capacity.The density of formation water ions and the capacity of cation exchange of each layer could be calculated according to spontaneous potential curve and polarizability curve of induced polarization log,and the formation water resistivity could be calculated.In addition,the oil saturation of argillarceous sandstone reservoir could also be calculated by using W S model.Through large amount of core tests,geological interpretation parametres suitable for this area are obtained but remain to be determined.Actural hydrocarbon exploration results proved that the electrochemic log interpretation model is well coincident with practical geological condition.