Geo Challenger set to complete 4-D surveyProjects and Operations // October 4, 2006
Geo Challenger is about to complete her first 4-D acquisition.
CGG has announced that its new flagship vessel Geo Challenger is set to successfully complete a 4-D seismic survey for a major North Sea client offshore Norway, the ship's first major acquisition project since her launch in June.
The assignment, covering an exceptionally large surface area of 930km2, has been particularly challenging in that the vessel has been required to achieve excellent repeatability on a baseline survey of the same area acquired by another contractor in 1997, in order to monitor reservoir changes around production facilities.
Geo Challenger is shooting the repeat survey with 12 5,100m Sercel Sentinel solid streamers with a 50m separation whereas an eight 3,600m streamer configuration had been deployed for the base survey.
The new solid streamers have demonstrated good stability in rough waters, allowing better control over the vessel’s complex configuration due to the close streamer spacing, and offered the advantage of reduced tow-related noise, enabling the vessel to continue operating in marginal weather conditions.
“Geo Challenger has more than met our expectations, achieving excellent productivity and very high repeatability on her first major deployment. As the first seismic vessel in the world to operate with this new solid streamer technology, she has successfully demonstrated her advanced acquisition capabilities on a particularly challenging survey with complex parameters,” said Christophe Pettenati-Auzière, President of Geophysical Services.
Geo Challenger is scheduled to sail to India in October where she will join other CGG vessels contracted to conduct a deepwater seismic programme for ONGC off the Eastern coast.