Journal
JOURNAL OF OCEAN UNIVERSITY OF CHINA
Volume 12, Issue 1, Pages 1-5Publisher
OCEAN UNIV CHINA
DOI: 10.1007/s11802-013-2110-3
Keywords
adaptive finite elements; marine CSEM; general anisotropy
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Funding
- National Natural Science Foundation of China [41130420]
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In this paper, we extend the scope of numerical simulations of marine controlled-source electromagnetic (CSEM) fields in a particular case of anisotropy (dipping anisotropy) to the general case of anisotropy by using an adaptive finite element approach. In comparison to a dipping anisotropy case, the first order spatial derivatives of the strike-parallel components arise in the partial differential equations for generally anisotropic media, which cause a non-symmetric linear system of equations for finite element modeling. The adaptive finite element method is employed to obtain numerical solutions on a sequence of refined unstructured triangular meshes, which allows for arbitrary model geometries including bathymetry and dipping layers. Numerical results of a 2D anisotropic model show both anisotropy strike and dipping angles have great influence on the marine CSEM responses.
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