航空瞬变电磁法三维各向异性数值模拟和响应特征研究  

Three-dimensional modeling and response characteristics of airborne transient electromagnetic data for anisotropic medium

作　　者：管清辰 谭捍东[1] 林昌洪[1] GUAN QingChen;TAN HanDong;LIN ChangHong(School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《地球物理学进展》2023年第1期449-465,共17页Progress in Geophysics

基　　金：中国自然资源航空物探遥感中心青年创新基金课题(2020YFL05);国家自然科学基金项目(41830429);山西省重点研发计划项目(202102080301001)联合资助。

摘　　要：随着瞬变电磁法的快速发展,三维任意各向异性介质的数值模拟成为研究热点.本文从时间域的麦克斯韦方程组出发,采用时域交错采样有限差分法,推导了时域电磁场的时间分步迭代公式,实现了任意各向异性介质的航空瞬变电磁三维正演.设计地电模型,与已有的软件计算结果进行对比,检验了三维正演算法的计算精度.设计了典型的三维各向异性地电模型,改变各向异性参数计算了航空瞬变电磁响应,分析了各向异性参数对航空瞬变电磁响应的影响.开发的正演算法为研究瞬变电磁法各向异性响应特征和三维反演提供了重要技术支撑.With the rapid development of transient electromagnetic method,numerical simulation of three-dimensional anisotropic media has become a hot research topic.Based on Maxwell’s equation,we derived the discrete iterative formula of electromagnetic field by using time domain finite difference method and realized the three-dimensional forward modeling of airborne transient electromagnetic data for anisotropic medium.The accuracy of the forward algorithm is verified by comparing the results with those of other software.We calculated the response of a typical three-dimensional anisotropic geoelectric model and analyzed the effect of anisotropic parameters on the airborne transient electromagnetic response.The forward algorithm provides an important technical support for the research of anisotropic response characteristics and three-dimensional inversion of transient electromagnetic method.

关 键 词：航空瞬变电磁法 各向异性 三维正演 时域有限差分 

分 类 号：P631[天文地球—地质矿产勘探]