SEISMIC SURVEYING 


Successful acquisition and processing of surveys


 Seismic survey companies are using ever more sophisticated techniques. Sean Ottewell reports.


 Unternehmen für seismische Untersuchungen setzen hochentwickelte Methoden ein. Ein Bericht von Sean Ottewell.


 Las compañías de investigación sísmica están utilizando técnicas más sofisticadas. Informa Sean Ottewell.


I


n Mexico, WesternGeco has begun the acquisition of the Revolution multiclient survey. According to the company,


Revolution marks the first time that Dual Coil Shooting multi-vessel full-azimuth acquisition has been performed commercially in the industry worldwide. Located in the East Breaks and Garden


Banks areas of the Western Gulf of Mexico, the survey will provide full-azimuth (FAZ) coverage for over 130 outer continental shelf (OCS) blocks. “We are encouraged by the initial images


derived from Revolution, our first Dual Coil survey. Te ultra long offsets combined with full-azimuth illumination enables significant imaging uplift in the Gulf of Mexico’s complex subsalt structures,” said Tomas Scoulios, North America region manager, WesternGeco. “We are pleased with the commitments from multiple underwriters who are helping to direct this project’s success.”


Fig 1. The Seabird vessel, Aquila Explorer. utilises high-end Sercel Sentinel Solid Streamer technology and Bolt Source equipment.


Building on multi- and wide-azimuth techniques, the FAZ Dual Coil Shooting is a new, advanced method of acquiring ultra long offset marine seismic data using four vessels following a circular path. Tis acquisition provides better target illumination in challenging environments by enabling greater azimuthal coverage and a higher signal-to-noise ratio. Dual Coil Shooting technology is possible due to the capabilities of the Q-Marine point-receiver seismic system. WesternGeco will apply the latest seismic


data processing techniques to this survey, including true-azimuth 3D generalised surface multiple prediction (3D GSMP) and anisotropic reverse time migration (RTM). Meanwhile Integra Group, a leading


FSU-based onshore oilfield services provider, has announced agreement on the principal terms of an exclusive seismic joint venture company with WesternGeco to be known as IG Seismic Services.


IHSS 8


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