Simultaneous source, long-offset, dual-azimuth acquisition offshore Gabon - a change in perspective

It is well known that imaging of complex regions can be significantly improved with increased illumination in terms of offset and azimuth sampling. In this case study we illustrate how an existing large scale acquisition can be enriched by acquiring a second complementary survey in a targeted area. The second survey was acquired perpendicular to the first with additional offsets for maximum impact. The long offsets were enabled during a single acquisition pass by utilising a source only vessel positioned ahead of the main source and receiver vessel using simultaneous shooting. The blended data was separated using an annihilation filter approach. In this paper we illustrate the advantages this second survey has brought to the area though improvements in the FWI velocity model and enhanced illumination for the deep structures.