2005 Strategic Environmental Assessment SEA2 Investigation of the origin of shallow gas in Outer Moray Firth open blocks 15/20c and 15/25d

As part of the Department of Trade and Industry's (now Department of Energy and Climate Change) Strategic Environmental Assessment (SEA2), this report briefly describes the evidence for the origin of shallow gas in Outer Moray Firth open blocks 15/20c and 15/25d. Sea floor pockmarks are known to occur within these blocks, and they indicate the seepage of gas from shallow levels into the local water column. An environmental concern is that any industry activity in these blocks must not plumb into any component of the system that is sustaining the gas seepages at sea bed. The study area covers two part-blocks within the eastern part of the Witch Ground Graben within the UK Central North Sea. This study follows on from the DTI 2001 SEA research on pockmarks.

Simple

Date (Publication)
2005-02-01
Citation identifier
British Geological Survey / BGS_SEA_16
Point of contact
Organisation name Individual name Electronic mail address Role

British Geological Survey (BGS)

Paul Henni

offshoredata@bgs.ac.uk

Custodian

Department for Energy and Climate Change (DECC)

enquiries@decc.gsi.gov.uk

Originator
Maintenance and update frequency
Not planned
Resource format
Name Version

Documents
Keywords

SeaDataNet Parameter Discovery Vocabulary

GEMET - INSPIRE themes, version 1.0

  • Geology

SeaVoX Vertical Co-ordinate Coverages
Use limitation

The SEAs data were produced as part of the UK Department of Energy and Climate Change's Offshore Energy Strategic Environmental Assessment programme; Crown Copyright, all rights reserved. The DECC SEA must be acknowledged in any maps or publications that make use of the data. All the data files are freely available to the public. The Strategic Environmental Assessment (SEA) data portal provides free access to available data and reports which have been produced through the SEA process. The site is run and managed by BGS on behalf of the Department of Energy and Climate Change (DECC). Many files can be downloaded directly from this website. Those that are too large to download can be ordered via the website for postal delivery from BGS. BGS (NERC) has been contracted by DECC to publish SEA datasets on its behalf. All intellectual property rights (including , without limitation, copyrights, database rights and all other rights which subsist or may at any time in the future subsist in the Dataset(s)) in the Dataset(s) ('Intellectual Property Rights') are owned by DECC (formerly the Department of Trade and Industry, and the Department for Business, Enterprise and Regulatory Reform). BGS has been authorised by DECC to use SEA datasets for all purposes but on a 'not-for-profit basis'. BGS has been authorised by DECC to pass on SEA datasets to third parties so that they can use them for all purposes but on a 'not-for-profit' basis.

Access constraints
Intellectual property rights
Distance
5  m
Language
English
Topic category
  • Environment
  • Geoscientific information
  • Oceans
Title

SeaVoX salt and fresh water body gazetteer
Date (Revision)
2006-01-01
Code
North Sea
N
S
E
W
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Begin date
2005-01-01
End date
2005-01-01
Supplemental Information

http://www.offshore-sea.org.uk/site/index.php

Reference system identifier
OGP / urn:ogc:def:crs:EPSG::4326
Distribution format
    OnLine resource
    Protocol Linkage Name
    http://www.bgs.ac.uk/data/sea/home.html

    Strategic Environmental Assessment (SEA) data portal
    Hierarchy level
    Dataset
    Statement

    This report was compiled by the British Geological Survey as part of the UK Department of Energy and Climate Change's Offshore Energy Strategic Environmental Assessment programme. The study comprised three main tasks: A desk study based on publications in the literature and unpublished reports to determine whether or not there is already a consensus on the derivation of the gas seepages in blocks 15/20c and 15/25d; A quick interpretation of available BGS shallow seismic data and commercial site survey data to determine the extent of the gas in the shallow subsurface.; Quick interpretation of appropriate horizons on the PGS MegaSurvey for indications of gas seepages from deeper levels. Use of seismic attribute analysis to map the locations of Tertiary channels that might be acting as migration conduits into the area. Investigate for gas chimneys, faults extending to shallow levels, amplitude anomalies, evidence for sediment remobilisation and any other evidence for upward gas migration into the shallow subsurface.

    Metadata

    File identifier
    aba64100-c106-4de3-e044-0003ba6f30bd XML
    Metadata language
    English
    Hierarchy level
    Dataset
    Date stamp
    2011-08-30
    Metadata standard name

    MEDIN Discovery Metadata Standard
    Metadata standard version

    Version 2.3.5
    Metadata author
    Organisation name Individual name Electronic mail address Role

    British Geological Survey (BGS)

    Mary Mowat

    offshoredata@bgs.ac.uk

    		Point of contact
     
     

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    Spatial extent

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    Keywords



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