Fast-track Marine CSEM Processing and 3D Inversion

We present CSEM 3D inversion results where the receiver rotation angle relative to North is treated as a free parameter in the optimization. This allows us to omit receiver orientation estimation and data rotation pre-processing in the workflow. Moreover, the initial resistivity model is prepared independently from the CSEM data using available seismic and well log information. In this way, calibrated frequency domain data can be input directly to the anisotropic 3D inversion tool, with arbitrary initial values for the rotation angles. Synthetic data is generated using speed optimized modeling parameters. This demonstrates a fast-track 3D inversion workflow which can deliver a 3D inverted resistivity volume within few days after data has been uploaded from the vessel.