The deep offshore of the Gulf of Guinea is a major challenge to seismic processing and imaging techniques, due to the complexity of the salt body structures (Figure 1). Even though Kirchhoff prestack time migration (preSTM) can image the top of salt and the wider, simple sedimentary basin reflections, it fails elsewhere.

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Strong surface-related and interbed multiples and mode conversions at the top of salt are difficult to identify and eliminate, which makes stacking velocity or tomography inversion for sediment velocities difficult. The geometry of the salt bodies makes time processing assumptions a priori invalid.

Using synthetic elastic...

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