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Anisotropic Imaging with Angola Block 31 Wide Azimuth DataNormal access

Authors: G. Xia, A. Cegna, R. Thomas, W. Rietveld, P. Whitfield, L. Ward, N. Woods and M. Hooke
Event name: 74th EAGE Conference and Exhibition incorporating EUROPEC 2012
Session: Wide- & Multi Azimuth Acquisition
Publication date: 04 June 2012
DOI: 10.3997/2214-4609.20148773
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 1.68Mb )
Price: € 20

We present the imaging workflow and results for the Angola Block 31 Wide Azimuth Towed Streamer (WATS) data acquired from 2008-2009. We highlight the importance of incorporating Tilted Transverse Isotropy (TTI) in building the sediment model. We find it critical to use the Reverse Time Migration (RTM) algorithm from the very beginning of building the salt model. Of interest also is the use of the P-S converted waves to aid salt picking. The WATS data also benefit from a joint application of both 3D SRME and wave-equation based demultiple methods. The final migrated dataset provides a significant improvement in image quality over the legacy surveys and fast track WATS, and will be used for the appraisal and development programs.

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