物探化探计算技术2025，Vol.47Issue(4)：497-507,11.DOI:10.12474/wthtjs.20240407-0001
起伏地形下三维大地电磁典型理论及实测数据正反演算例分析
Analysis of forward and inversion examples for classical undulating terrain models and measured data in 3D mangetotelluric
摘要
Abstract
In the exploration of magnetotelluric,the presence of terrain undulation on the Earth's surface can pose significant challenges to the interpretation of measured data.To address this issue,this study adopts a three-dimensional MT finite element method with hexahedral meshing for forward modeling.A stepped grid is used to simulate the terrain,and classical terrain models are numerically simulated to analyze the influence of three-dimensional terrain on MT responses.Additionally,based on the L-BFGS algorithm,a comparative study is conducted on the inversion of forward modeling data for undulating terrain,comparing inversions that neglect terrain with inversions that consider terrain.This validation highlights the necessity of considering terrain in inversions.Furthermore,the L-BFGS algorithm,considering terrain,is applied to the three-dimensional inversion processing of measured MT data in a specific working area,yielding an inversion result that accounts for the terrain of the working area.The inversion result is compared with the actual geological data of the working area,showing good correspondence and demonstrating that three-dimensional inversion with terrain in MT can be an effective means for data processing in areas with undulating terrain.关键词
起伏地形/三维正演/三维反演/MTKey words
rolling terrain/3D forward/3D inversion/MT分类
天文与地球科学引用本文复制引用
姚孟远,罗强,杨锐,高文龙,袁崑铭,李远昊..起伏地形下三维大地电磁典型理论及实测数据正反演算例分析[J].物探化探计算技术,2025,47(4):497-507,11.基金项目
国家自然科学基金重点项目(42230311) （42230311）
