PGS
Marine Geophysical high technology North Sea survey
Posted: 2 October 2003
PGS Marine Geophysical successfully completed a high density, single-source,
multi-azimuth 3-D seismic survey over the Ellon, Grant, Forvie and
Hild Fields in the Northern North Sea.
The work was carried out on behalf of the operators TOTAL E&P
UK and Norway.
In order to achieve the object of improved resolution and improved
signal-to-noise ratio, PGS utilised their HD3DTM ( High Density
3D) acquisition system. The Ramform Victory which used 14 streamers,
4500m in length, towed just 37.5 m apart completed the single source
survey. The configuration allowed a close spacing of 18.75m, which
reduced the aliasing of higher frequencies in the cross-line direction.
The spacing was obtained while maximising the signal-to-noise with
the benefit of full-fold processing.
In addition to the 600 sq. km of the main survey, in order to obtain
superior imaging of the sub-surface in the structurally complex
Hild Field area, an additional 200 sq. km of data were acquired
in a multi-azimuth direction across this area.
This technique uses data acquired in two or more directions to
improve signal quality as shown by similar acquisition and results
over the Varg Field in Norway.
The acquisition of over 800 sq. km of HD3D data was completed in
8 days after start of production, during which there were no lost
time incidents.
Even with 63 km of streamers in the water in a spread of 14 streamers
less than 1 km width, technical downtime was only 5 per cent.
Posted by Richard Price,
Editor Pipeline Magazine
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