物探与化探2026，Vol.50Issue(1)：86-98,13.DOI:10.11720/wtyht.2026.2354
基于em3d的复杂地电模型瞬变电磁三维正演及响应规律分析
3D TEM forward modeling of complex geoelectric model based on em3d software
摘要
Abstract
Three-dimensional forward modeling in transient electromagnetic(TEM)surveys is a crucial tool for studying the response patterns of different scenarios and targets.A key issue in forward modeling is ensuring that the model closely approximates the actual geological conditions.This paper uses the EM3D software to model and conduct three-dimensional forward analysis of complex terrain and karst geological models,investigating the response characteristics of transient electromagnetic fields under complex geoelectric con-ditions.The three-dimensional forward simulation of complex terrain models reveals that complex terrain induces distortions in the tran-sient electromagnetic response,and ignoring terrain effects can lead to false anomalies.The three-dimensional forward simulation of complex karst geological models shows that undulating strata and the boundaries of complex karst anomalies also cause distortions in the transient electromagnetic response,significantly interfering with anomaly identification.Analysis of the transient electromagnetic re-sponses of the two complex geoelectric models indicates that the vertical induced electromotive force d Bz/dt effectively reflects low-re-sistivity bodies,the electric field Ey parallel to the source accurately delineates the boundaries of low-resistivity bodies,and the electric field Ex perpendicular to the source shows positive values within the anomaly and coexisting positive and negative values outside the a-nomaly.关键词
瞬变电磁/起伏地形/复杂模型/正演模拟/BEDS-FDTD/em3dKey words
transient electromagnetic/complex terrain/complex model/forward simulation/BEDS-FDTD/em3d分类
天文与地球科学引用本文复制引用
王晓明,刘博,赵彧,刘东,柳尚斌,杨光,胡杉杉,周永兴,孙怀凤..基于em3d的复杂地电模型瞬变电磁三维正演及响应规律分析[J].物探与化探,2026,50(1):86-98,13.基金项目
广西重点研发项目(桂科AB22080010) （桂科AB22080010）
泰山学者工程资助项目 （）
