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Three-dimensional magnetotelluric modelling in anisotropic media using the A-phi method
Tiaojie Xiao;  Xiangyu Huang;  Yun Wang
2019
Source PublicationExploration Geophysics
Volume50Issue:1Pages:31-41
Abstract

It is important to study the responses of the magnetotelluric (MT) method in anisotropic media. However, MT anisotropy research has focused mainly on one-dimensional (1D) and two-dimensional (2D) solutions. Therefore, we developed a three-dimensional (3D) finite element (FE) algorithm for MT modelling in anisotropic media. This approach is based on the weak formulation of the governing Maxwell equations using Coulomb-gauged potentials. The node-based FE method is adopted here, and the values of the coefficient matrixes are obtained with hexahedral meshes. To validate the correctness and accuracy of this method, its results are compared with previous solutions for a 2D anisotropic model and a 3D arbitrary anisotropic model, respectively. Different solvers with different preconditioners are tested, and the results show that the quasi-minimum residual method with the incomplete LU preconditioner is more stable and faster compared with the other schemes. We then studied a 3D anisotropic model in three different conditions, and analysed the results in detail. Finally, three main conclusions are obtained: the xy- and yy-mode apparent resistivities remain almost unchanged if a principal conductivity is in the x-direction; the yx- and xx-mode apparent resistivities remain almost the same if a principal conductivity is in the y-direction; a principal conductivity in the z-direction has almost no influence on apparent resistivities.

KeywordMagnetotelluric anisotropy 3d Modelling coulomb-gauged Potentials finite Element
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10383
Collection矿床地球化学国家重点实验室
Affiliation1.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
2.University of Chinese Academy of Sciences, Beijing, China
3.School of Geosciences and Info-Physics, Central South University, Changsha, China
Recommended Citation
GB/T 7714
Tiaojie Xiao;Xiangyu Huang;Yun Wang. Three-dimensional magnetotelluric modelling in anisotropic media using the A-phi method[J]. Exploration Geophysics,2019,50(1):31-41.
APA Tiaojie Xiao;Xiangyu Huang;Yun Wang.(2019).Three-dimensional magnetotelluric modelling in anisotropic media using the A-phi method.Exploration Geophysics,50(1),31-41.
MLA Tiaojie Xiao;Xiangyu Huang;Yun Wang."Three-dimensional magnetotelluric modelling in anisotropic media using the A-phi method".Exploration Geophysics 50.1(2019):31-41.
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