Identification

Title

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

Abstract

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.

Resource type

dataset

Resource locator

http://www.bgs.ac.uk/data/sea/home.html

name: Strategic Environmental Assessment (SEA) data portal

description: The Strategic Environmental Assessment (SEA) data portal provides free access to available data and reports which have been produced through the UK Department of Energy and Climate Change 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.

function: download

Unique resource identifier

code

BGS_SEA_16

codeSpace

British Geological Survey

Dataset language

eng

Spatial reference system

authority code

OGP

code identifying the spatial reference system

urn:ogc:def:crs:EPSG::4326

Additional information source

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

Classification of spatial data and services

Topic category

environment

geoscientificInformation

oceans

Keywords

Keyword set

keyword value

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2011-03-25

Keyword set

keyword value

Geology

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Geographic location

West bounding longitude

-1.9

East bounding longitude

3.3

North bounding latitude

61.8

South bounding latitude

52.8

Extent

Extent group

authority code

title

reference date

date type

revision

effective date

2006-01-01

code identifying the extent

Temporal reference

Temporal extent

Begin position

2005-01-01

End position

2005-01-01

Dataset reference date

date type

publication

effective date

2005-02-01

Frequency of update

notPlanned

Quality and validity

Lineage

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.

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

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.

Constraint set

Responsible organisations

Responsible party

organisation name

British Geological Survey (BGS)

full postal address

Murchison House, West Mains Road

Edinburgh

EH9 3LA

UK

telephone number

+44 (0)131 667 1000

email address

offshoredata@bgs.ac.uk

responsible party role

custodian

Responsible party

organisation name

Department for Energy and Climate Change (DECC)

full postal address

Admiralty Way

London

SW1A 2HD

UK

telephone number

+44 0300 060 4000

facsimile number

+44 (0) 1823 284077

email address

enquiries@decc.gsi.gov.uk

responsible party role

originator

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey (BGS)

telephone number

+44 (0)131 667 1000

facsimile number

+44 (0)131 668 4140

email address

offshoredata@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2011-08-30

Metadata language