三电极系侧向测井的径向几何因子

本文在下述前提下用分离变量法求得了径向非均质情形近似电位场的分布,并进一步给出了简化计算公式。这些前提是:1.忽略电极系上绝缘环的影响;2.限于介质电阻率为缓变的情形,忽略电流折射的影响,近似地认为电极系上电流密度均匀分布;3.把电极系当作线电极来处理。

THE RADIAL GEOMETRIC FACTORS FOR THE THREE ELECTRODE GUARD LOGGING

In this paper we get the approximate distributions of the electric potential fields by use of the method of separation of variables under the following premiss:1,We neglect the influence of the insulating rings connecting the principal elect-rode and the guard electrodes;2,We restrict to the case of media of slowly varying resistivities and conse-quently neglect the influence of the refraction of electric current. We also suppose that the current density of the electrode system is nearly homogeneous;3,The electrode system is taken as a linear electrode.