Abstract

In this paper we show how marine CSEM data interpretation can be improved if the data are acquired with an expanded frequency spectrum. Especially in case of targets located in a wide range of depth, both high and low frequency data can provide useful information for identifying different prospects with variable size and depth. We discuss a CSEM application to a real data set recently acquired in deep water offshore Nigeria using two central frequency values: 0.05Hz and 0.25Hz. Both frequencies, together with higher frequency harmonics (0.75Hz and 1.25Hz), have been used for multi-frequency and multi-dimensional modelling and inversion with excellent results