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| | Abstract | | Electrical anisotropy is one of the important issues that may make the interpretation of marine electromagnetic data difficult. This presentation introduces and tests a Gauss-Newton method-based 3D inversion algorithm for marine CSEM and MT data that accounts for a type of anisotropy, referred to as transverse isotropy in the vertical direction (TIV). It is shown from a synthetic data example that while the resistive target can be delineated by isotropic or anisotropic inversion of inline data, both inline and broadside measurements are needed to derive anisotropic structures. It is also shown that MT data alone are not suited for capturing anisotropy, because MT fields are primarily horizontal. |
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