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《Chinese Journal of Geophysics》 2017-08
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Finite-element modeling of 3D MCSEM in arbitrarily anisotropic medium using potentials on unstructured grids

CHEN Han-Bo;LI Tong-Lin;XIONG Bin;CHEN Shuai;LIU Yong-Liang;College of Geo-Exploration Sciences and Technology,Jilin University;College of Earth Sciences,Guilin University;  
A secondary potential formulation of the three-dimensional marine controlled source electromagnetic method modeling in arbitrarily anisotropic medium is derived based on unstructured grids and coulomb gauge. Next, solving the finite element equations with IDR(s)iterative algorithm combined with the incomplete LU decomposition technology. Once the secondary vector and scalar potential is solved, we can use the moving least square method to calculate their spatial derivative and compute the secondary electric and magnetic field. In order to test the finite element method for numerical modeling of 3 D controlled sources electromagnetic data in an arbitrarily anisotropic conductive medium of this paper, we have applied the developed algorithm to compute the typical CSEM response of two 3 D models. The modeling results show that the proposed algorithm is feasible and effective; the IDR(s) is competitive with or superior to ILU-QMR and ILU-BICGSTAB methods; the proposed algorithm is general and can be applied to EM modeling in borehole and environment geophysics in arbitrarily anisotropic medium.
【Fund】: 中国地质调查局项目(12120113098400);; 南海重磁震地学断面综合研究(20162X05026007-001)资助
【CateGory Index】: P631.325
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【Citations】
Chinese Journal Full-text Database 6 Hits
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【Co-citations】
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1 WANG ShuMing;DI QingYun;WANG Ruo;SU XiaoLu;Mohamed A;Hubei Subsurface Multi-scale Imaging Key Laboratory,Institute of Geophysics and Geomatics,China University of Geosciences;Institute of Geology and Geophysics,Chinese Academy of Sciences;;Removing airwave effects using electromagnetic fields decomposition for 3D MCSEM[J];地球物理学报;2018-02
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