A 3D CSEM survey was acquired in a frontier deepwater area in SE-Asia to provide input for portfolio ranking and risk mitigation. The interpretation process of the 3D data set was heavily driven by 3D inversion. Various 3D inversion approaches were tested and the results demonstrated the importance of including anisotropy. Interpretations based on the isotropic 3D inversion differ from the interpretation of the anisotropic result, the latter coinciding with the pre-survey geomodel. The final interpretation of the CSEM data suggested significant hydrocarbon charge to be restricted to only one-third of the original prospect area, off the crest of the structure, reducing the potential of the prospect significantly.

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