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3D CSAMT modelling in anisotropic media using edge-based finite-element method
He, Guoli1,3; Xiao, Tiaojie2,3; Wang, Yun2; Wang, Guangjie1,3
2019-01-02
Source PublicationEXPLORATION GEOPHYSICS
ISSN0812-3985
Volume50Issue:1Pages:42-56
AbstractControlled-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.
KeywordCSAMT anisotropy modelling three-dimensional finite element
DOI10.1080/08123985.2019.1565914
Funding OrganizationNational 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
WOS KeywordAUDIO-FREQUENCY MAGNETOTELLURICS ; TENSOR CSAMT ; CSEM DATA ; CONSTRAINED INVERSION ; EXPLORATION ; VECTOR ; RESPONSES ; AREA
Language英语
Funding ProjectNational Key Research and Development Project of China[2016YFC0600301] ; National Natural Science Foundation of China[41425017]
Funding OrganizationNational 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000478063700005
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92924
Collection中国科学院地质与地球物理研究所
Corresponding AuthorXiao, Tiaojie
Affiliation1.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
Recommended Citation
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.
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