Three-dimensional inversion of CSAMT data in the presence of topography

被引：11

作者：

Lin, Changhong ^{[1
]}

Tan, Handong ^{[1
]}

Wang, Wangwang ^{[1
]}

Tong, Tuo ^{[1
]}

Peng, Miao ^{[1
]}

Wang, Mao ^{[1
]}

Zeng, Weihua ^{[1
]}

机构：

[1] China Univ Geosci Beijing, Sch Geophys & Informat Technol, Beijing 100083, Peoples R China

来源：

EXPLORATION GEOPHYSICS | 2018年 / 49卷 / 03期

基金：

中国国家自然科学基金;

关键词：

3D inversion; CSAMT; topography; NONLINEAR CONJUGATE GRADIENTS; MAGNETOTELLURIC INVERSION; ELECTROMAGNETIC-FIELDS; RESPONSES;

D O I：

10.1071/EG16067

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

3D controlled-source audio frequency magnetotelluric (CSAMT) responses can be distorted strongly by topography and should be accounted for in data inversion and interpretation. In this paper we present a scheme to incorporate topographic distortions into the inversion instead of correcting them. This approach has been verified by comparing the modelling results with 2D FEM CSAMT solutions and synthetic inversion examples. Compared with the responses generated from a half-space model with flat surface, it is found that not only the topography in the survey area but also that at the source position may strongly distort the CSAMT responses. The field example indicates that results with topography are much better than those without considering topography to map the distribution of coal seam underground, which also illustrates the effectiveness of our approach.

引用

页码：253 / 267

页数：15

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