Modeling and Migration of Marine CSEM Data in the Areas with the Rough Bathymetry

In this paper we present a new approach to interpretation of the MCSEM data in the areas with the rough bathymetry. This approach is based on a new formulation of the integral equation EM modeling method in the models with inhomogeneous background conductivity. The developed technique allows us to incorporate the known geological structures and bathymetry effects in the method of iterative EM migration/holographic imaging and inversion. This approach provides us with the ability to pre-compute only once the effect of the known geoelectrical structure (e.g., the bathymetry effect) and keep it unchanged during the entire modeling and migration process. The method is illustrated by the numerical examples of modeling and inversion of the marine CSEM data in the areas with the rough bathymetry.