基于积分方程法的大地电磁三维反演  

THREE DIMENSIONAL MAGNETOTELLURIC INVERSION BASED ON INTEGRAL EQUATION METHOD

作　　者：徐凯军[1] 李桐林[2] 刘展[1] 

机构地区：[1]中国石油大学地球资源与信息学院,山东青岛266555 [2]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《物探化探计算技术》2009年第6期564-567,共4页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家863计划资助项目(2006AA06Z204)

摘　　要：采用积分方程法计算均匀半空间中三维异常体的大地电磁响应,然后利用阻尼最小二乘法反演得到地下三维异常体电阻率分布。在计算灵敏度矩阵时,将灵敏度矩阵分为线性项和体现反演过程非线性的偏微分项进行求解,提高了计算精度。理论模型反演结果表明,反演较准确,对初值依赖性小,且只针对异常体剖分单元进行反演,反演效率较高。This paper calculates the 3D magnetotelluric responses in homogeneous half space using integral equation method and apply the damped least square method to inverse the resistivity of 3D model.When calculating sensitivities matrix,we decompose the sensitivities matrix into linear and nonlinear partial differentia terms for precise calculation.The inversion result shows that the inversion algorithm is right and does not rely on the initial value very much,furthermore the inversion has high efficiency because it only inverses the dissected unit.

关 键 词：大地电磁三维反演 阻尼最小二乘法 积分方程法 灵敏度矩阵 

分 类 号：P631.325[天文地球—地质矿产勘探]