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Goliat Field - Step Change Imaging Results with the First Multi-azimuth, Single Source Seismic Survey in the Barents SeaNormal access

Authors: M. Buia, J. Leutscher and E. Tozzi
Event name: 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011
Session: Wide/Multi Azimuth Acquisition Processing
Publication date: 23 May 2011
DOI: 10.3997/2214-4609.20149221
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 4.8Mb )
Price: € 20

Summary:
the area is problematic, due the presence of strong 3D multiples, complex geology with multi-direction faults, generating illumination problems and seismic noise related to adverse sea conditions. The vintage seismic, despite several reprocessing, failed to provide a proper input for reservoir characterization. After a comprehensive feasibility study, considering also future 4D monitoring, a new three-azimuth, single source seismic survey was acquired. Being the target depth illumination the main aim of the survey, the acquisition QC and the infilling decisions were based on ray tracing “hit maps”. Phantom undershooting for future 4D use was also acquired. After multi-azimuth processing and summation of azimuthal volumes, “step change” results were achieved in term of noise attenuation, 3D multiple elimination and imaging of faults and sub fault zones. The whole workflow provided eventually a proper input for reservoir characterization, a good “baseline” for 4D monitoring of the field and gave confidence in the development drilling plan. The technical route followed for this project demonstrated successful in solving most of the geophysical issue in Goliat field and could be extended to future works in this poorly explored area


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