摘要
瞬变电磁法应用于矿产资源、环境工程等领域。目前主流的瞬变电磁三维正演模拟方法包括积分方程法、有限差分法、有限体积法和有限元法。随着观测环境的复杂化以及探测精度要求的提高,有必要研究瞬变电磁法高精度三维模拟计算,以便推动数据处理解释方法的进步。本文系统介绍了瞬变电磁三维正演计算研究进展,分析了准静态差分方程的构建和发射源的加载及边界的处理等有限差分法的关键技术,厘定出空间和时间离散以及大型线性方程组的求解等有限元法的难题。瞬变电磁数值模拟今后的发展方向是深入开展近源情况下受场源效应、复杂地形、极化效应等影响的三维模拟,以及特殊场情况下的多源多分量响应计算,为瞬变电磁法精细探测提供理论支撑。
Transient electromagnetic method(TEM)has been widely used in the mineral resources detection and environment engineering exploration.Up to now,the most commonly used forward simulation methods for TEM response contain integral equation method,finite difference method,finite volume method and finite element method.With the more complex exploration conditions and the much higher detection accuracy demand,it s of importance to study the high-resolution three-dimentional simulations of TEM to further improve the data processing and interpretation technologies.The research progress on three-dimentional TEM forward simulations was introduced in detail.Besides,the key technologies of finite difference method,such as the construction of quasi-static difference equation,the loading of emission source and boundary conditions,were analyzed.The key problems of the finite element method,such as the space discretization,time discretization and the solving of large linear equations,were put foward.It is concluded that to provide theory support for high-resolution detection of TEM in three-dimentional forward simulation is required to solve the following problems:carrying out response calculations of the field source effect,complex topography problem,polarization effect related to near-field methods,realizing multi-source and multi-components TEM forward modeling of special application situation.
作者
薛国强
常江浩
雷康信
陈康
XUE Guo-qiang;CHANG Jiang-hao;LEI Kang-xin;CHEN Kang(Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;The Third Geological Exploration Institute of Qinghai Province,Xining 810000,Qinghai,China;Hebei Key Laboratory of Strategic Critical Mineral Resources,Hebei GEO University,Shijiazhuang 050031,Hebei,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《地球科学与环境学报》
CAS
北大核心
2021年第3期559-567,共9页
Journal of Earth Sciences and Environment
基金
第二次青藏高原综合科学考察研究专题(2019QZKK0804)
国家自然科学基金项目(42030106,42074121)
中国科学院科研仪器设备研制项目(YJKYYQ20190004)
中国博士后科学基金项目(2020M670442)
自然资源部煤炭资源勘查与综合利用重点实验室开放项目(KF2020-3)。
关键词
瞬变电磁法
三维计算
有限差分法
有限元法
快速精细模拟
准静态方程
场源效应
极化效应
transient electromagnetic method
three-dimentional simulation
finite difference method
finite element method
fast and fine simulation
quasi-static equation
field source effect
polarization effect
