三维大地电磁激电效应特征研究  

Study on Induced Polarization Effect of Three Dimensional Magnetotelluric

作　　者：徐凯军[1] 石双虎 周家惠[1] 

机构地区：[1]中国石油大学华东地球资源与信息学院,山东东营257061 [2]东方地球物理公司国际勘探事业部,河北涿州072751

出　　处：《西北地震学报》2009年第1期31-34,85,共5页Northwestern Seismological Journal

摘　　要：在积分方程法的大地电磁三维正演模拟中引入Cole-Cole模型研究激电效应特征,对均匀半空间中存在极化体时的三维大地电磁测深响应进行了理论计算,分析了极化参数的影响规律。结果表明:激电效应使观测视电阻率值变低;地下高阻极化体比低阻极化体的激电效应强,特别是极化率大的高阻极化体对大地电磁响应影响大,使观测结果出现假异常。In the forward simulation of 3D magnetotelluric using integral equation method, the Cole-Cole model is led into for studing characteristics of the induced polarization effect. For the first time the authors calculate the responses of 3D magnetotelluric in homogeneous half-space including a polarizable body, and summarize some response rules. The results show that the induced polarization effect makes the value of apparent resistivity decrease. The induced polarization effect of high-resistivity polarizable body is stronger then one of low-resistivity polarizable body,especially the body with high chargeability has great effection to the response, even cause false anomaly in apparent resistivity observation.

关 键 词：三维大地电磁 积分方程 COLE-COLE模型 激电效应 

分 类 号：P631.325[天文地球—地质矿产勘探]