3D CSAMT modelling in anisotropic media using edge-based finite-element method

doi:10.1080/08123985.2019.1565914

	3D CSAMT modelling in anisotropic media using edge-based finite-element method
	He, Guoli 1,3; Xiao, Tiaojie 2,3; Wang, Yun 2; Wang, Guangjie 1,3
刊名	EXPLORATION GEOPHYSICS
	2019-01-02
卷号	50 期号:1 页码:42-56
关键词	CSAMT anisotropy modelling three-dimensional finite element
ISSN号	0812-3985
DOI	10.1080/08123985.2019.1565914
英文摘要	Controlled-source audio-frequency magnetotellurics (CSAMT) is an important geophysical technique. Numerous studies have shown that the electrical anisotropy in the Earth cannot be ignored because it would probably lead to misinterpretations of electromagnetic data. It is necessary and meaningful to study CSAMT responses in three-dimensional (3D) electrical anisotropic media; therefore, we have developed an edge-based finite element method for 3D CSAMT forward modelling in generalised anisotropic media. The total electric field in this approach is decomposed into a primary electric field and a secondary electric field, and the Galerkin weighted residuals method is adopted to obtain the variational equation. The accuracy of this algorithm was initially validated by comparing solutions with those obtained in previous work on a 3D arbitrary anisotropic model. We then studied the responses of an oblique source as well as equatorial and axial configurations and the tensor source for anomalies with different Euler's angles. Several meaningful conclusions can be derived from this work and a synthetic model is developed; the results also confirm the validity of previous conclusions. This study shows that a tensor source is necessary for a CSAMT survey in 3D anisotropic media, and the anisotropic parameters of anomalies have complex and significant influences on CSAMT responses.
资助项目	National Key Research and Development Project of China[2016YFC0600301] ; National Natural Science Foundation of China[41425017]
WOS关键词	AUDIO-FREQUENCY MAGNETOTELLURICS ; TENSOR CSAMT ; CSEM DATA ; CONSTRAINED INVERSION ; EXPLORATION ; VECTOR ; RESPONSES ; AREA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	TAYLOR & FRANCIS LTD
WOS记录号	WOS:000478063700005
资助机构	National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92924]
专题	中国科学院地质与地球物理研究所
通讯作者	Xiao, Tiaojie
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geochem, Guiyang 550081, Guizhou, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	He, Guoli,Xiao, Tiaojie,Wang, Yun,et al. 3D CSAMT modelling in anisotropic media using edge-based finite-element method[J]. EXPLORATION GEOPHYSICS,2019,50(1):42-56.
APA	He, Guoli,Xiao, Tiaojie,Wang, Yun,&Wang, Guangjie.(2019).3D CSAMT modelling in anisotropic media using edge-based finite-element method.EXPLORATION GEOPHYSICS,50(1),42-56.
MLA	He, Guoli,et al."3D CSAMT modelling in anisotropic media using edge-based finite-element method".EXPLORATION GEOPHYSICS 50.1(2019):42-56.