一种高分辨率组合侧向电极系及其性能分析

为了解决电阻率测井仪的纵向分辨率和径向探测深度的矛盾。介绍了一种新型的高分辨率组合侧向电极系，并对其测井响应及性能进行了高效数值模拟。数值模式匹配方法是一种解析－数值混合方法，它使非均匀介质中的场的二维数值分析简化为一维数值分析和另一维的解析递推，从而大大了数值计算量。

Numerical analysis of a high resolution multi-electrodes laterolog tool

In this paper, a new idea about the design of the combined lateral logging tool with high resolution has been presented.The numerical eigenmodes for one dimension are first obtained and the Green's function for potential in the two dimension in homogeneous (axisymmetric) media is then deduced by using numerical mode matching(NMM) method.With the Green's function of potential and the surface integration equations,complex source problems have been modeled and solved.The numerical simulation has shown that this tool has superior vertical resolution and deeper radial probing depth than traditional dual laterolog tool therefore is very good for thin beds probing.The computation speed of the NMM program is much higher than the finite element method(FEM), and can be efficiantly used for begging interpretation.