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D037 Solving the Problem of Inverting CSEM Data Contaminated by the Effects of a Varying Seafloor MKM Hagdorn* (OHM Ltd) & L. MacGregor (OHM Ltd) SUMMARY The marine controlled source electromagnetic (CSEM) sounding method is becoming more and more important as an exploration tool for hydrocarbon reservoirs. The majority of CSEM models to date have assumed a flat seafloor. This approximation is sufficient if the target reservoir exhibits a dominant CSEM signal. However as the technology matures targets with a much smaller predicted response are surveyed where this assumption no longer holds. Seafloor variations have two effects: firstly in