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A Full-waveform Inversion Case Study from Offshore Gabon
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
We applied full waveform inversion to a seismic dataset from offshore Gabon. This dataset features complex geology such as diapirism, shallow gas pockets and dewatering faults. We show the results on a large production-size swath using an advanced full waveform inversion method based on a specialized quasi-Newton optimization algorithm. The updated velocity model highlights an uplift in resolution and a consistency with the geological features observed in the depth migrated stack. The benefits include identifying features and faults in the overburden, and improved top-salt characterization. This results in better imaging in both the post- and pre-salt regions, as well as a velocity model that aids the geological interpretation.