Inversion of marine CSEM data using up‐down wavefield separation and simulated annealing

Abstract

We demonstrate how processing data from shallow water CSEM surveys using up‐down separation can improve the performance of a global inversion scheme. Data from a receiver over a known prospect produces a markedly improved reproduction of the resistivity profile in a plane‐layer model employed for illustrative purposes. This improvement being particularly pronounced in the absence of a strong resistive anomaly, the results are directly applicable to finding starting models for more rigorous 3D inversion schemes as well as a to creating a reference model for Scanning survey interpretation.