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Vector-acoustic Reverse-time Migration of Volve OBC Dataset without Up/Down Decomposed WavefieldsNormal access

Authors: M. Ravasi, I. Vasconcelos, A. Curtis and A. Kritski
Event name: Second EAGE/SBGf Workshop 2014
Session: Session III - Processing II
Publication date: 04 November 2014
DOI: 10.3997/2214-4609.20147399
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.69Mb )
Price: € 20

Summary:
Wavefield separation based on the combination of pressure and particle velocity data is generally used to extract the up- and down-going components from multi-component seabed or towed marine seismic recordings prior to imaging. By carefully combining vector-acoustic (VA) data in the extrapolation of shot gathers in reverse-time migration (RTM) we show that wavefield separation (deghosting) can be performed ‘on-the-fly’ at no extra cost. We call such a strategy VARTM and we successfully apply it to a North Sea OBC field dataset, acquired in the Volve field. We also discuss additional advantages of VARTM over standard RTM of up-going only waves such as improved handling of directivity information contained in the acquired vector-acoustic data for clearer shallow sections and imaging of the down-going component of the recorded field (mirror VARTM) without the need for an additional finite difference modelling.


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