PGS has started its latest ultra-high-density seismic survey in the Barents Sea, extending its Hammerfest Basin coverage farther west and north into the southern Loppa High.
PGS has started its latest ultra-high-density seismic survey in the Barents Sea, extending its Hammerfest Basin coverage farther west and north into the southern Loppa High.
The acquisition geometry builds on the configuration previously applied on the PGS18004NBS survey, applying a wide-tow source configuration in combination with a tailored ultra-high-density GeoStreamer set-up.
PGS is aiming to obtain even more near offsets by extending the survey geometry used on the 2018 acquisition to push the towing limits achievable from a single vessel.
This technical set-up, which includes wide-source spread, high-density streamers, and long tails for FWI, has been tailored for the precise imaging of extremely shallow targets without compromising illumination of targets at deeper levels.
The vessel Ramform Tethys is operating a dense, 16-streamer spread of variable lengths, with 56.25 m separation, including a sparse set of 10km-long streamers for FWI-based velocity model building.
First data will be available Q4 2020.
Meanwhile, PGS has updated its interactive Barents Sea rockAVO Atlas to offer data on 144 wells, including 18 wells drilled since 2018. Cross-referenced with the PGS data library, this offers a link between seismic response and rock properties for the region.
Data on every publicly available and relevant well is available for licensing from the rockAVO Barents Sea Atlas. More than 17 different reservoirs have been modelled, providing an interactive reference database of petrophysics and rock physics for the region.
Included in the latest update is the 7121/8-1 Blåmann well, which contains a discovery in the Jurassic Stø formation. This well in the Hammerfest Basin is covered by modern GeoStreamer 3D seismic data (PGS18M04NBS), along with other wells such as 7121/5-2 (Snøhvit Beta Field), 7122/7-3 (Goliat), 7120/12-2 (Alke Sør) that are also included in the Barents rockAVO atlas. The combination of the rockAVO wells and GeoStreamer seismic data provides an integrated dataset that can be used to assess prospectivity across the basin.
Also included in the 2020 update is the 7435/12-1 Korpfjell well, which has a gas discovery in the Jurassic Stø and Triassic Kobbe formations. This well is integrated with the PGS GeoStreamer PURE (ST14005) seismic survey, combining seismic and well data to derisk the southeast Barents Sea.
Well data delivered in rockAVO provides petrophysical logs, rock physics models, and interactive seismic AVO modelling capabilities for each well in the Atlas. Linking the rockAVO Atlases to the PGS MultiClient data library makes it possible to calibrate GeoStreamer and other seismic data with conditioned well data and known production scenarios, said PGS.
Rock physics properties vary from basin to basin, and from stratigraphic interval to interval. For each, a separate model or rock physics template has been calibrated to relate the seismic response to rock and fluid properties.
‘E&P companies can now access a homogeneous database of interpreted well logs throughout the Barents Sea, making it possible to analyse the seismic AVO signature based on different fluid and matrix property perturbations,’ said PGS.
