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Advanced imaging solutions for tailored multi-source and multi-vessel surveysNormal access

Authors: Gordon Poole, Vetle Vinje, Ewa Kaszycka, Thomas Mensch, Risto Siliq, Anne Camerer, Hari Krishna and Erling Frantzen
Journal name: First Break
Issue: Vol 37, No 11, November 2019 pp. 73 - 79
DOI: 10.3997/1365-2397.2019031
Special topic: Marine Seismic & EM
Language: English
Info: Article, PDF ( 5.11Mb )
Price: € 30

Summary:
In recent years there has been increased creativity in the design of seismic acquisition campaigns aimed at maximizing the illumination and sampling of the subsurface. When combined with innovations in imaging technology, these new acquisition methodologies can provide significant improvements to images of the subsurface in both exploration and production settings. Onshore, receiver and source arrays have evolved to dense wide-azimuth acquisitions using single-source/single-sensor approaches in the Middle East. This has been driven by the now-proven benefits for processing, imaging and reservoir characterization that the data sets deliver (Ourabah et al., 2014; Michou et al., 2017). These campaigns have been rendered cost-effective by high-productivity blended acquisition strategies, which utilize large areal receiver spreads and a large number of single vibroseis sources operating simultaneously. The advent of accurate deblending algorithms allowing high-productivity simultaneous shooting strategies to be used successfully, without compromising image quality, have made the approach viable for large-scale surveys. The advantage for onshore simultaneous shooting is that vibrator sources utilize a sweep which simplifies deblending significantly (Bagaini, 2006). In a marine setting, however, deblending is more challenging due to the use of impulsive airgun sources. In conventional acquisition, two sources are deployed in flip-flop mode, typically with 7-10 seconds between consecutive source actuations to allow reflected signals to be fully recorded before the next shot is fired. Historically, methods to increase trace density and improve acquisition efficiency have been limited to significantly increasing the number and density of streamers, ranging from a single streamer in early acquisitions up to 24 streamers in more modern configurations


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