MT阻抗张量在二维与三维介质中的分析  

Analysis of MT impedance tensor in two and three dimensions

作　　者：胡玮哲 熊高君[1] HU Weizhe;XIONG Gaojun(Exploration technology and engineering,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地球物理学院

出　　处：《物探化探计算技术》2018年第2期205-211,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：四川省教育厅项目石油地球物理勘探(KZB029)

摘　　要：大地电磁测深法主要研究岩石圈的电性结构,以及对高阻覆盖层下的低阻矿物进行探测。大地电磁测深法利用天然交变的平面电磁波(10^(-4) Hz^10~4 Hz)为场源,依据在地表观测到的包含地下地质体信息的电场值与磁场值计算出阻抗张量,并由阻抗张量计算出的视电阻率以及相位曲线特征来分析大地电性结构特征。通过对阻抗张量的旋转分析、SVD分解、通用分析以及阻抗张量扩展,来获得阻抗张量元素的地质信息,并提出了解决三维介质阻抗张量的计算方法。Magnetotelluric sounding method has high resolving power in studying the electrical structure of lithosphere and low resistivity minerals under high resistivity cover.The use of natural alternating electromagnetic wave(10-4~10 4Hz)field source,based on electric field contains the underground geological information on the surface resistivity observation value calculated by impedance tensor and magnetic field values,and the apparent resistivity and phase curves are calculated to analyze the electrical structure of the earth.The present research and analysis of the impedance tensor is of great significance.This paper through the rotation analysis,SVD decomposition,general geological information analysis and extension of impedance tensor magnetotelluric impedance tensor element,calculation method is proposed to solve the three-dimensional dielectric impedance tensor.

关 键 词：大地电磁 阻抗张量 电阻率 

分 类 号：P631.2[天文地球—地质矿产勘探]