As part of the NSTA’s
published 2018/19 Activity Plan, the NSTA is publishing a set of regional
geological maps for the West of Shetland and West of Hebrides. These maps represent
the seventh set of deliverables from a 3 year contract with Lloyd’s Register
(LR) to produce a series of maps and associated databases for the whole of the
UKCS.
All data released with this
set of geological maps is public domain data. The project has, however,
benefited from a number of additional third party data sources which have been
used to help inform final maps and/or derive interpreted products. These
include the seismic interpretation work carried out by Aberdeen University on
the Rockall area, CGG’s Target database and relevant products available via the
BGS’s Offshore Geoindex. TGS are gratefully acknowledged for providing joined
digital log data from LogLinePlus to enable the production of lithology curves.
BGS is acknowledged for providing additional seismic data to help carry out the
project and CDA are also kindly acknowledged for their support in downloading
and providing much of the released well data to LR as part of this project.
Due to the high level,
regional nature of the project, the maps are being produced for the main
geological time intervals e.g. Paleocene, Lower Cretaceous, Upper Jurassic.
Most time intervals include the following products:
• Depth structure maps
• Isochore maps
• Structural elements maps
• Depositional facies maps
• Reservoir distribution
maps
• Source rock maps
• Well penetration maps
• Hydrocarbon occurrence
maps
Depth structure, Isochore
and Structural Elements maps for the area were only produced for the Eocene
(seabed - Base Stronsay Group), Paleocene (Base Stronsay – Base Sullom/Top
Shetland) and Upper Cretaceous, as deeper stratigraphic levels did not allow
extensive regional seismic interpretation due to depth of burial, lack of well
penetrations and structural complexity.