物探与化探2026，Vol.50Issue(3)：533-550,18.DOI:10.11720/wtyht.2026.1209
地形起伏条件下地空瞬变电磁电性源形态畸变效应与观测系统优化
Semi-airborne transient electromagnetic method:Geometrical distortion effects of grounded source under undulating terrain conditions and optimization of observation systems
摘要
Abstract
As mineral exploitation is gradually shifting to complex terrain areas,the traditional transient electromagnetic(TEM)method has encountered challenges such as inconvenient deployment and low efficiency in these areas.In contrast,the semi-airborne TEM(SATEM)method,which combines a ground-based transmitter and an airborne receiver,can significantly improve data acquisition effi-ciency and adaptability in complex areas.However,due to the undulating terrains,the grounded source often deviates from the ideal straight-line pattern.The geometrical distortion effects of the grounded source on electromagnetic responses remain under-studied.Through 3D finite-element forward modeling,this study systematically analyzed the electromagnetic field distortions caused by the cur-vature and vertical undulation of the grounded source under typical undulating terrains,such as mountain peaks and valleys.The results indicate that the non-ideal geometry of the grounded source is the primary cause of early asymmetric electromagnetic responses and false anomalies.Mountain peaks concentrate the electromagnetic energy in the shallow parts of the mountains,suppressing the detection depth,whereas valleys enhance subsurface coupling due to the lower position of the grounded source,thus expanding the early detection range.More importantly,adopting a terrain-following flight line(i.e.,maintaining a constant receiver height relative to the ground surface)can effectively mitigate the false anomalies of apparent resistivity caused by the geometrical distortion of the grounded source and the terrain coupling.Accordingly,this study proposes a SATEM-optimized data acquisition scheme for complex terrains,providing theoretical sup-port and technical guidance for improving the accuracy of deep resource exploration.关键词
地空瞬变电磁法/三维数值模拟/有限单元法/场源布设/地形/电磁响应畸变/采集方案优化Key words
semi-airborne transient electromagnetic(SATEM)method/3D numerical simulation/finite element method/field source deployment/terrain/electromagnetic response distortion/optimized data acquisition scheme分类
天文与地球科学引用本文复制引用
刘建利,李新胜,陈小龙,李冰,赵旭阳,申晨..地形起伏条件下地空瞬变电磁电性源形态畸变效应与观测系统优化[J].物探与化探,2026,50(3):533-550,18.基金项目
陕西地矿集团科研专项资金项目"150kW大功率地空瞬变电磁方法技术研究"(KY202314) （KY202314）
