Due to excellent sedimentary environment in the ocean, strong layering and stratifications can be developed, resulting in distinct electrical anisotropy in the earth under the ocean. Electrical anisotropy can have serious effects on MCSEM survey data; using traditional isotropic models to interpret anisotropic MCSEM data can deliver distorted results. To understand the influence of the electrical anisotropy on MCSEM responses, we study in this paper 3D marine CSEM modeling for an arbitrarily anisotropic earth. We use the staggered finite-difference algorithm, combined with volume average or volume current average method for handling the conductivity tensor elements, accomplish successfully 3D MCSEM modeling for an arbitrarily anisotropic earth. Comparison and analysis of MCSEM responses (MVO and PVO) for different isotropic and anisotropic models reveal the characteristics related to the influence of the electrical anisotropy on Marine EM responses and identification technique from the MCSEM survey for the electrical anisotropy of the media under the ocean. The results obtained from the numerical experiments in this paper offer the technical support to the detailed interpretation of the MCSEM data.


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