Seafloor topography inversion
Marked bathymetric variations along CSEM profiles can create significant effects on CSEM data which, unless adequately processed, can completely obscure the response of underlying resistive structure.
OHM’s proprietary sea floor topography inversion should be used in such regimes and fully compensates for changes to the electromagnetic fields at both the source and receivers due to bathymetric variations.
Changes in water depth at the source, receivers and the intervening section of the earth cause a variety of perturbations of the transmitted and received electromagnetic signals. Failure to correct for these in inversion will provide an incorrect result and will often map airborne energy and water column interference into the subsurface image.
The seafloor topography inversion module performs a calculation of the source wave field and the receiver wave field on a complex adaptive grid which fully describes the seafloor topography. This allows an accurate forward prediction of the CSEM signal to be projected into the 2.5D inversion engine enabling the inversion to solve for the correct subsurface structure.