瞬变电磁法三维模拟计算研究进展

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...

Review on Three-dimensional Simulations of Transient Electromagnetic Field

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.