PGS
Geophysical completes innovative seismic survey in
Dutch Gas Basin for Wintershall Noordzee B.V.
Posted: 17 June 2003
Faced with a series of technical challenges to provide better imaging
of pre-salt section beneath steep-sided salt features, Wintershall
Noordzee B.V. and partners contracted PGS Geophysical to use innovative
multi-azimuth technology for the acquisition of 3D seismic data.
The survey over Block L5b of the Dutch North Sea involved acquiring
data in two orthogonal directions in order to obtain better spatial
sampling and illumination of the target.
These data when combined will provide a dataset with much-improved
signal-to-noise ratio and resolution of the reservoir. A similar
technique was previously used by PGS over its Varg field offshore
Norway.
Gravity data was also acquired simultaneously on the same dual
grid, which will further aid in determining the extent of the salt
bodies during processing.
In addition to the seismic objectives, the survey presented significant
operational challenges including varying shallow water depths, wrecks,
platforms, a gas pipeline and busy shipping lanes.
It is therefore a testament to Wintershall's planning and PGS'
operational efficiency that the survey was completed ahead of schedule
and with minimal operational and technical downtime.
"The challenges that we needed to overcome required an alternative
approach that would produce results that could not have been achieved
through conventional seismic acquisition techniques," said
Fiona Dewey, Geophysical Advisor of Wintershall.
For more information see www.pgs.com.
Posted by Richard Price,
Editor Pipeline Magazine
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