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MT二维正演计算中地形影响的研究
石油物探
2000年 39卷 第No. 3期
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Title
On the research of the influence of terrain to MT 2D forward computation
单位
江汉石油学院地球物理勘探系,荆州434102
Organization
Geophysical Dept. Of Jianghan petroleum college Jingzhou 434102
摘要
本文以有限元直接迭代算法为基础,首先给出了各种基本地表条件下的有限元迭代格式和复杂地表条件下视电阻率的定义。在此算法的基础上,通过 2个简单的算例讨论了地形起伏对MT视电阻率和相位的影响,证实了复杂地表下 2种极化模式的MT观测资料都有明显的异常,并且以TM模式尤为严重。文中总结了一些地形起伏对MT资料的影响情况,同时分析了MT视电阻率异常的成因,提出了一些自己的观点。
Abstract
In this paper we first presents different iterative finite element schemas for different terrains and introduces the definition of apparent resistance. The influence of terrains to MT apparent resistance and phase is then illustrated by two simple examples. It is confirmed that abnormalities both in TE mode and TM mode are obvious, especially in the TM mode. The effects of topographic undulation are documented which can provide references for field operation and data processing.
关键词：
MT;
正演;
有限元迭代格式;
地形;
Keywords:
MT;
forward problem;
iterative scheme of finite element method;
terrain;
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