Using Seismic Full Waveform Inversion to Guide 1D Marine CSEM Inversions for Resolving Multiple Resistive Layers

摘要

In order to study the physical processes occurring inside the earth we require accurate images of the subsurface. Two of the most successful methods for doing this are seismic and electromagnetic sensing, but no current single method is entirely sufficient for building a complete picture. This problem is especially acute in industrial applications such as hydrocarbon reservoir permanent monitoring, where some changes in reservoir fluid properties are near impossible to detect with conventional acoustic seismics. Electromagnetic methods can detect the fluid properties of interest however the resolution is poor. We present a method which uses the resolution at depth of full waveform seismic inversion to guide a controlled source electromagnetic inversion. The result of combining the techniques in this manner on synthetic examples allows us to model multiple layered structure to within a few percent of the true values.