期刊
COMPUTERS & GEOSCIENCES
卷 73, 期 -, 页码 164-176出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cageo.2014.09.008
关键词
Numerical solutions; Marine electromagnetics; Electromagnetic theory; Electrical anisotropy; Finite element
资金
- University of Utah's Consortium for Electromagnetic Modeling and Inversion (CEMI)
- National Natural Science Foundation of China [40974077, 41164004]
- TechnoImaging
This paper presents a linear edge-based finite element method for numerical modeling of 3D controlled-source electromagnetic data in an anisotropic conductive medium. We use a nonuniform rectangular mesh in order to capture the rapid change of diffusive electromagnetic field within the regions of anomalous conductivity and close to the location of the source. In order to avoid the source singularity, we solve Maxwell's equation with respect to anomalous electric field. The nonuniform rectangular mesh can be transformed to hexahedral mesh in order to simulate the bathymetry effect. The sparse system of finite element equations is solved using a quasi-minimum residual method with a Jacobian preconditioner. We have applied the developed algorithm to compute a typical MCSEM response over a 3D model of a hydrocarbon reservoir located in both isotropic and anisotropic mediums. The modeling results are in a good agreement with the solutions obtained by the integral equation method. (C) 2014 Elsevier Ltd. All rights reserved.
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