摘要
本文讨论了任意N层平面分层,每层又可具有任意柱面分层的轴对称二维非均匀有耗介质结构,分析电磁波在其中的传播、散射特性.由于采用电磁场的数值模式匹配理论,径向用离散数值本征模式替代连续模,纵向则用模式匹配方法导出场递推关系的解析表达式,大大减少了数值计算量,而计算精度不变.场的数值结果可很好的再现地下电参数剖面.相应的数值分析程序可用于从感应测井到电磁波测井的计算机辅助解释.
In this paper the analysis of electromagnetic propagation and scattering from axially symmetrical, two dimension-layered media with arbitriry N planar layers in virtical direction and cylindrical layers in radial direction has been made. The numerical mode matching (NMM) theory is used to simplify computation. In this method the discrete numerical eigenmodes are used in radial direction and the mode matching method is used in virtical direction to derive the recurrent expresions of the field. This half-analytical and half-numerical method avoids tremendous computation of two dimensions as in Finite element method (FEM). The subsurface electrical parameter profile can be rebuilt by using the numerical results of the field. Counting for inference of various factors in the subsurface formation, this method can be used as computer aid explaination tool for induced logging and deep propagation logging tool (DPT).
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第4期479-489,共11页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
测井
电磁波
轴对称
二维层状介质
Electromagnetic wave logging, Numerical mode matching, Electromagnetic scattering.
