OR/16/020 Methodology

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Loveless, S, and Smith, N. 2016. Summary of potential oil and gas formations in England for use in groundwater vulnerability assessments. British Geological Survey Internal Report, OR/16/020.

The names of prospective hydrocarbon rock formations, members or groups were identified from the three DECC (2013) reports (DECC, 2013a[1]; 2013b[2], 2013c[3]) and from Andrews (2013[4]; 2014[5]) and Greenhalgh (2016)[6]. Where the potential hydrocarbon unit cited was not indicated on the GVS it was mapped back to a parent unit (usually group or age-group and lithology), on the GVS, using the BGS Lexicon (www.bgs.ac.uk/lexicon/). Each rock unit identified on the GVS is also summarised in the table below. A description of the hydrocarbon potential of each identified rock unit is included in this report.

These rock units will also be identified on the National Geological Model (NGM) (UK3D 2015[7]) sections and will guide the user in identification of the possible hydrocarbon potential of rock units in the area of interest and allow comparison with groundwater-bearing formations. It should be noted that often potential reservoir units are also groundwater-bearing units and vice-versa; this report does not specify possible oil/gas-water contacts within the units.

The method for identifying the rock types with hydrocarbon potential differs slightly for each exploration method and is indicated in each subsection.

References

  1. DECC, 2013A. The hydrocarbon prospectivity of Britain’s onshore basins — shale gas. (Department for Energy and Climate Change: London).
  2. DECC, 2013B. The unconventional hydrocarbon resources of Britain’s onshore basins — coalbed methane. (Department for Energy and Climate Change: London).
  3. DECC, 2013C. The unconventional hydrocarbon resources of Britain’s onshore basins — shale gas. (Department for Energy and Climate Change: London).
  4. ANDREWS, 2013a. The Carboniferous Bowland Shale gas study: geology and resource estimation. (Department for Energy and Climate Change: London).
  5. ANDREWS, I J. 2014a. The Jurassic shales of the Weald Basin: geology and shale oil and shale gas resource estimation. (Department for Energy and Climate Change: London).
  6. GREENHALGH, E. 2016. The Jurassic shales of the Wessex area: geology and shale oil and shale gas resource estimation. (Department for Energy and Climate Change: London).
  7. UK 3D v2015. UK 3D — 3D geological model for the United Kingdom (online). Available: www.bgs.ac.uk/research/ukgeology/nationalGeologicalModel/GB3D.html. Last Accessed 24 May 2016.