基于Maxwell 3D瞬变电磁法三维正演研究

Research about 3D Forward Modeling of Transient Electromagnetic Method Based on Maxwell 3D

瞬变电磁法(TEM)是一种时间域电磁法,在地球物理勘探领域得到广泛应用。目前三维反演的快速性与精确度均存在着很多问题,这就需要三维正演分析提供支持,但是应用于瞬变电磁法的专业三维正演软件非常缺乏。基于此,本文创新性地将Ansoft Maxwell 3D引入瞬变电磁法地质探测的正演分析中,建立了均匀半空间瞬变电磁正演模型,与传统的电磁模型分析软件EMMA进行对比,证实了Maxwell用于瞬变电磁法正演的可行性与有效性;同时,还构建了低阻三维地质异常体的Maxwell正演模型。仿真结果可以很好地反映地下异常体的存在,证明Ansoft Maxwell 3D能很好的应用于TEM正演模型的构建与分析。

Transient electromagnetic method （TEM） is a very valuable way in the time domain electromagnetic methods which is used widely in geophysical electromagnetic field. At present, there are many problems with speed and precision about 3D inversion, which needs 3D forward analysis providing support. Though, there is very little software based on 3D forward modeling in domestic used for TEM. This article model forward methods based on Ansoft Maxwell 3D, used in the TEM forward modeling analysis. Compared with the traditional electromagnetic model analysis software-EMMA, it is not only proved to be feasibility in even half space model ,but also to build a low resistance globe model, simulation analysis model, and the simulation results can well reflect the existence of the underground anomalyglobe. The research process proved that Ansoft Maxwell 3D can be a very good used in modeling and analyzing TEM forward method, contenting the guidance demand of inversion method.