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Simultaneous Source, Long-offset, Dual-azimuth Acquisition Offshore Gabon - A Change in PerspectiveNormal access

Authors: D. Cook, G. Poole, R. Schouten, C. Mallows, K. Cichy and H. McHugh
Event name: 79th EAGE Conference and Exhibition 2017
Session: Simultaneous Sources - Acquisition and Processing
Publication date: 12 June 2017
DOI: 10.3997/2214-4609.201700870
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 4.68Mb )
Price: € 20

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.

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