Electrical anisotropy of steeply-dipping sedimentary rock formations can have a significant effect on marine CSEM data. We demonstrate how this TTI anisotropy can be taken into account in a 3D CSEM inversion, and compare VTI and TTI inversion results for a synthetic model and a CSEM field data set acquired over steeply-dipping geology. The results show that VTI inversion of CSEM data is inadequate in anisotropic, steeply-dipping geology, leading to spurious resistivity anomalies, whereas the TTI inversion produces geologically sound resistivity models with a better data fit.
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