PGS completes successful 4D overlap base-survey for Statoil
Posted: 05 February 2004
Using the vessel Ramform Victory, PGS has successfully completed
a customized 4D base survey for Statoil over the Albatross/Snøhvit
field, offshore Norway.
To achieve an overlap configuration, the vessel deployed 10 streamers
over an 8 streamer pre-plot survey. The overlap allowed the streamer
vessel to follow the survey’s straight pre-plot lines, ensuring
complete surface coverage and reduced infill. Infill shooting on
this survey was below 5 per cent.
The conditioned 4D base survey simplifies and optimizes the repetition
of source positions for future repeat surveys. The repetition of
such shot positions, in combination with the overlap configuration,
improves azimuth preservation for 4D acquisition.
Using the surplus data acquired in the overlap zones and selective
binning schemes, it will be possible to achieve a better 4D match.
Source-receiver azimuths can be better matched using this approach.
Acquiring 4D data with such a strategy gives a more complete surface
coverage and thus assures improved repetition for acquisition and
processing of future 4D surveys.
Benefits of 4D Overlap
- Reduces infill shooting
- Minimises crossline deviations
- Simplifies the repetition of shot points in repeat surveys
- Almost perfect azimuth matching
For more information see http://www.pgs.com/
Posted by Richard Price,
Editor Pipeline Magazine
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