Abstract

We present a novel hybrid method for modeling the marine controlled source electromagnetic (CSEM) response of a complex geoelectrical subsurface. The method, FE-SIE, combines the finite element (FE) and simplified integral equation (SIE) methods, thereby overcoming the standard limitation of the conventional integral equation (IE) method related to use of a horizontally layered background only. FE-SIE accurately computes the background electric field for a complex geoelectrical subsurface using FE on an unstructured grid. The anomalous electric field is calculated very efficiently, using SIE equipped with the accurate background field and semi-analytical Green's tensors. FE-SIE should be particularly useful in an inversion setting where the background geoelectrical structures are fairly well known {em a priori}, while the location of the target, or the presence of a target, is unknown or highly uncertain. The need for accurate (i.e., not semi-analytical) modeling of more complex geoelectrical background structures is demonstrated. Finally, the accuracy of FE-SIE is demonstrated on a geoelectrical structure containing both a complex background and a highly resistive target.

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