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Simultaneous Source, Long-offset, Dual-azimuth Acquisition Offshore Gabon - A Change in Perspective
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
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 in a direction perpendicular to the first with additional offsets for maximum impact. The long offsets were obtained 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 through improvements in the full waveform inversion velocity model and enhanced illumination for imaging the deep structures.