Onshore Gabon

Another example of the application of 3D SJI for salt detection and improved sub-salt imaging is from onshore Gabon. Airborne gravity and seismic data were acquired by Perenco, who worked together with WesternGeco to create a realistic input model for the joint inversion. In this case the SJI attempts to fit simultaneously both gravity and seismic datasets by finding the best velocity and density models.

SJI is able to detect uncertainty in salt interpretations, and can lead the interpreter towards correct salt boundaries. Where previous interpretation within the pre-salt section of this South Gabon sub-basin was limited by poor imaging, particularly beneath salt mounds, analysis of the reprocessed seismic lines provided improved continuity.