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Expanding the frequency spectrum in marine CSEM applications

In this paper we show how marine controlled source electromagnetic data interpretation can be improved if the data are acquired with an expanded frequency spectrum. Especially in the case of targets located at a wide range of depths, both high‐ and low‐frequency data can provide useful information for improving the risk analysis associated with different prospects with variable size and depth. We discuss an application to a real data set acquired in deep water offshore Nigeria using two values of fundamental frequency: 0.05 Hz and 0.25 Hz. Both frequencies, together with higher frequency harmonics, have been used for multi‐frequency and multi‐dimensional modelling and inversion with excellent results.