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Technical Paper: Crossline Wavefield Reconstruction from Multimeasurement, Towed Marine Seismic Data and Its Implications for Imaging

Society: EAGE
Paper Number: Th-08-15
Presentation Date: 2013
 

Abstract:

Measurements of particle motion bring significant benefits to towed marine seismic data when processed in conjunction with pressure data. We describe how horizontal particle velocity (Vy) measurements can enable dealiased crossline wavefield interpolation and, hence, improve the final image. For this purpose, 3D synthetic data, representative of the Barents Sea area and consisting of a single shot line, are used to simulate two different, realistic acquisition geometries. For each acquisition scenario we focus on those features and areas where enhancement through interpolation is expected. We then apply novel interpolation techniques, based on both single- and multimeasurement seismic data, to reconstruct the seismic wavefield between the streamer positions on a shot-by-shot basis prior to imaging. Finally, for both acquisition geometries, we assess the impact of denser crossline sampling on the wavefield-extrapolated migration image and we show that the multichannel crossline wavefield reconstruction prior to imaging provides better protection against aliasing-related noise in the image. This finding is further corroborated by trials on the SEG advance modeling (SEAM) I model where we use modeled multiple shot lines to investigate the contribution of 3D stacking to the attenuation of migration noise originating in spatial aliasing.

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