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{{OR/16/020}}
The names of prospective hydrocarbon rock formations, members or groups were identified from the three DECC (2013) reports (DECC, 2013a<ref name="DECC 2013a">DECC, 2013A. ''The hydrocarbon prospectivity of Britain’s onshore basins — shale gas''. (Department for Energy and Climate Change: London).</ref>; 2013b<ref name="DECC 2013b">DECC, 2013B. ''The unconventional hydrocarbon resources of Britain’s onshore basins — coalbed methane''. (Department for Energy and Climate Change: London).</ref>, 2013c<ref name="DECC 2013c">DECC, 2013C. ''The unconventional hydrocarbon resources of Britain’s onshore basins — shale gas''. (Department for Energy and Climate Change: London).</ref>) and from Andrews (2013<ref name="Andrews 2013">ANDREWS, 2013a. ''The Carboniferous Bowland Shale gas study: geology and resource estimation''. (Department for Energy and Climate Change: London).</ref>; 2014<ref name="Andrews 2014">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).</ref>) and Greenhalgh (2016)<ref name="Greenhalgh 2016">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).</ref>. 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 ([http://www.bgs.ac.uk/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<ref name="UK3D 2015">UK 3D v2015. ''UK 3D — 3D geological model for the United Kingdom'' (online). Available: [http://www.bgs.ac.uk/research/ukgeology/nationalGeologicalModel/GB3D.html/ www.bgs.ac.uk/research/ukgeology/nationalGeologicalModel/GB3D.html]. Last Accessed 24 May 2016.</ref>) 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==
<References/>
[[Category: OR/16/020 Summary of potential oil and gas formations in England for use in groundwater vulnerability assessments | 05]]

OR/16/020 Methodology - Revision history

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Ajhil at 10:54, 15 February 2017