Date (Creation)

2005

Identifier

http://data.bgs.ac.uk/id/dataHolding/13603044

Maintenance and update frequency

irregular Irregular

GEMET - INSPIRE themes, version 1.0

• Geology

BGS Thesaurus of Geosciences

• Natural hazards
• Carbon dioxide
• Methane
• Geology
• UK Location (INSPIRE)

dataCentre

• UK Location (INSPIRE)

Keywords

• NERC_DDC

Access constraints

otherRestrictions Other restrictions

Other constraints

Access currently restricted to data manager (J D Appleton), and BGS Enquiry staff delivering geological assessments to to external clients.

Use constraints

otherRestrictions Other restrictions

Other constraints

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints

Either: (i) the dataset is made freely available, e.g. via the Internet, for a restricted category of use (e.g. educational use only); or (ii) the dataset has not been formally approved by BGS for access and use by external clients under licence, but its use may be permitted under alternative formal arrangements; or (iii) the dataset contains 3rd party data or information obtained by BGS under terms and conditions that must be consulted in order to determine the permitted usage of the dataset. Refer to the BGS staff member responsible for the creation of the dataset if further advice is required. He / she should be familiar with the composition of the dataset, particularly with regard to 3rd party IPR contained in it, and any resultant use restrictions. This staff member should revert to the IPR Section (ipr@bgs.ac.uk ) for advice, should the position not be clear.

Spatial representation type

grid Grid

Denominator

50000

Metadata language

EnglishEnglish

Topic category

• Geoscientific information

Geographic identifier

GBN

Date (Revision)

2009

Geographic identifier

GREAT BRITAIN [id=139600]

Date (Creation)

1979

Begin date

1990

End date

2006

Supplemental Information

Updating of 1:250,000 data in parts of Wales should be carried out as new 1:50,000 DiGMapGB-50 data becomes available. Updates will depend on availability of funding. Data set described in BGS INTERNAL REPORT IR/05/089R. Rock strata and unconsolidated deposits can be classified using BGS 1:50,000 scale DiGMapGB data (or 1:250,000 for those sectors of Wales for which 1:50,000 scale geological data is not availabe) according to their susceptibility to gas seepages as follows: [1] Moderately gas susceptible bedrock sources that contain major coal seams, with enhanced susceptibility where the available evidence suggests the coal seams may have been mined. [2] Moderately gas susceptible superficial deposit sources in which peat is the major constituent. Peat and organic material in buried watercourses, ponds, docks and reservoirs and tidal river sediments can not be identified using 1:50,000 scale DiGMapGB data. [3] Low to moderate gas susceptible bedrock sources that contain minor coal seams, with enhanced susceptibility where the available evidence suggests the coal seams may have been mined. [4] Low to moderate gas susceptibility where Carboniferous rocks are overlain by younger strata. There is a risk of encountering gas in boreholes, underground mining or tunnels intersecting buried (concealed) Carboniferous, Jurassic or younger strata because these are the major gas and oil source and reservoir rocks in Great Britain. The risk is higher in certain structural settings such as structural highs at shallow depth and near faults that intersect Carboniferous strata. In the concealed coalfields, the gas hazard is probably greatest where development takes place above and adjacent to abandoned, imperfectly sealed shafts. [5] Low to moderately gas susceptible superficial deposits in which peat is a relatively minor but potentially significant component. [6] Low to moderate oil susceptible bedrock sources: Devonian Old Red Sandstone oil source rocks of the Moray Firth and Orkney Islands in north east Scotland; Lias black shale source rocks for minor oil seepages in the Wessex Basin (Dorset) and the Wealden Basin (East Sussex); Lower Palaeozoic black shale source rocks for oil (bitumen) impregnations in the Welsh Borderlands (these are currently not identified using DiGMapGB-50 data. [7] Low to moderate carbon dioxide susceptibility from carbonate bedrocks. In certain circumstances, carbon dioxide problems may be associated with carbonate bedrocks that occur at or close to the surface, especially if these come into contact with sulphide rich rocks. [8] Low to moderate gas susceptibility associated with spoil from coal and sulphide mines. [9] Enhanced susceptibility related to: Sandstones in coal mining areas, which act as gas migration pathways; Faults. Major faults affecting outcropping moderately gas susceptible strata and similar strata buried by unconsolidated deposits are potential migration pathways with a higher risk of surface and near-surface gas emissions. Where major Permian or Mesozoic faults affect buried strata, there is a higher risk of intersecting gas in boreholes; Mine shafts and adits, which act as gas migration pathways: comprehensive information on the location of these is currently available only from the Coal Authority; Permeable superficial deposits. [10] Reduced susceptibility related to: Gas source rocks overlain by more than 5 m of superficial deposits; Gas source rocks overlain by impermeable superficial deposits.

Unique resource identifier

OSGB 1936 / British National Grid (EPSG::27700)

Distribution format

• Hardcopy. Natural Land Gas section in Geological Assessment Standard and Geological Assessment Detailed GeoReports produced for external clients. ()

OnLine resource

BGS Homepage ( WWW:LINK-1.0-http--link )

The BGS Homepage is an entry point to the BGS data services.

Hierarchy level

dataset Dataset

Statement

Derivation of methane, carbon dioxide and oil seepages geohazard data started as part of a DoE research project (1990-1995) and continued as part of the BGS GENI and Business Products Programmes (2004-2005) and IPR & Data Licensing Programme (2005-2006)

File identifier

9df8df52-d617-37a8-e044-0003ba9b0d98 XML

Metadata language

EnglishEnglish

Hierarchy level

dataset Dataset

Date stamp

2025-12-15

Metadata standard name

UK GEMINI

Metadata standard version

2.3

Dataset URI

http://data.bgs.ac.uk/id/dataHolding/13603044