摘要
针对地形对电磁测量结果的影响,设计了一组带地形模型,采用有限差分法对其进行了正演模拟计算。对模拟结果进行了分析,总结了地形对电磁测量视电阻率的影响规律,即TM模式比TE模式易受地形影响,山顶比山谷易受地形影响。在此基础上,分析了常用地形校正方法的优缺点;理论模型和实测资料反演结果表明带地形的二维联合反演可有效消除地形影响。
A model with topography was designed.Using the finite difference method,the authors studied the effects of topography on the apparent resistivity and phase curve of MT.Through an analysis and study of distortion curves of simulating models,a number of useful conclusions have been reached.It is shown that the apparent resistivity of TM mode is more easily affected by terrain than that of TE mode,and is more easily distorted at the top than on the bottom of a hill.Meanwhile,theoretical model and real data processing results indicate that the two-dimensional inversion with terrain is very effective and suitable to eliminating the effect of topography on the MT responses.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第3期364-367,共4页
Geophysical and Geochemical Exploration
关键词
电磁法
地形影响
地形校正
带地形联合反演
magnetotelluric method
topography distortion
topography correction
two-dimensional inversion
