大地电磁地形校正—以镇巴区块为例

Correction of Topography in Magnetotelluric Sounding——Taking Zhenba Area as Example

摘要:

地形起伏大会严重影响大地电磁测深的解释效果,不同的地形特征将会造成不同的影响,可以采用一定的校正方法压制或消除这种影响。本文以镇巴区块为例研究了地形影响的特点,实现了地形校正。解释结果清楚地显示出镇巴区块几条主要断裂以及存在推覆体,与该区构造特征基本一致。

Abstract:

Topography with great rising and falling could affect the interpretation result of magnetotelluric sounding strongly, and different topographic characteristic could cause different effects. But the effects can be suppressed or eliminated by using certain correction method. In this paper, taking Zhenba area as example, characteristic of the topographic effects is studied, and topography correction is carried out successfully. The interpretation result reveals some main faults and nappe clearly, accord with the tectonic structure of this area well.