Summary of Potential Oil and Gas Formations in England for Use in Groundwater Vulnerability Assessments Groundwater Programme Open Report OR/16/020
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Summary of potential oil and gas formations in England for use in groundwater vulnerability assessments Groundwater Programme Open Report OR/16/020 BRITISH GEOLOGICAL SURVEY GROUNDWATER PROGRAMME OPEN REPORT OR/16/020 Summary of potential oil and gas formations in England for use in groundwater vulnerability assessments S Loveless and N Smith The National Grid and other Ordnance Survey data © Crown Copyright and database rights 2016. Ordnance Survey Licence No. 100021290 EUL. Keywords: Oil and gas source rocks; groundwater vulnerability Bibliographical reference LOVELESS, S AND SMITH, N. 2016. Summary of potential oil and gas formations in England for use in groundwater vulnerability assessments. British Geological Survey Open Report, OR/16/020. 31pp. Copyright in materials derived from the British Geological Survey’s work is owned by the Natural Environment Research Council (NERC) and/or the authority that commissioned the work. 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All rights reserved Keyworth, Nottingham British Geological Survey 2016 BRITISH GEOLOGICAL SURVEY The full range of our publications is available from BGS shops at British Geological Survey offices Nottingham, Edinburgh, London and Cardiff (Welsh publications only) see contact details below or shop online at www.geologyshop.com BGS Central Enquiries Desk Tel 0115 936 3143 Fax 0115 936 3276 The London Information Office also maintains a reference collection of BGS publications, including maps, for consultation. email [email protected] We publish an annual catalogue of our maps and other publications; this catalogue is available online or from any of the Environmental Science Centre, Keyworth, Nottingham BGS shops. 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Jon Ford and the National Geological Model (NGM) team who’s many years of work this report, and project, is dependent on. Ricky Terrington provided the England-only version of UK3D and support with GSI3D. Melinda Lewis provided discussions around the GVS and rock units included. Holger Kessler has provided advice. Project management and direction has been provided by John Bloomfield and Rob Ward. The 3DGW Vulnerability project is a co-funded project between the British Geological Survey and the Environment Agency. The authors would like to thank the Environment Agency for their financial support for the project as well as contributing to the project vision. In particular, they would like to acknowledge the role of Ian Davey and Alwyn Hart, in proposing and supporting the joint initiative. This work has benefitted significantly from the contribution and involvement of the project Steering Group: Lynn Foord, Jan Hookey, Rudi Lui, Sara Mathews and Paul Doherty. ii OR/16/020 Contents Foreword ......................................................................................................................................... i Acknowledgements ........................................................................................................................ ii Contents ......................................................................................................................................... iii Summary ........................................................................................................................................ v 1 Introduction ............................................................................................................................ 1 1.1 potential hydrocarbon resource types ............................................................................. 1 2 Methodology ........................................................................................................................... 2 3 Potential hydrocarbon groups .............................................................................................. 2 3.1 Conventional hydrocarbons ............................................................................................ 8 3.2 Coal bed methane (CBM) ............................................................................................. 14 3.3 Shale gas and oil ........................................................................................................... 16 3.4 Underground Coal Gasification (UCG) ........................................................................ 19 References .................................................................................................................................... 20 Appendix 1 ................................................................................................................................... 21 Appendix 2 ................................................................................................................................... 22 iii OR/16/020 TABLES Table 1 Groups identified as prospective for oil and gas, coal bed methane (CBM) and shale oil and gas and underground coal gasification (UCG) ................................................... 3 iv OR/16/020 Summary The joint Environment Agency (EA) and BGS project “3D Groundwater Vulnerability” (3D GWV) will develop a methodology for attributing vulnerability of groundwater to pollution from sub-surface oil and gas exploration and production activities, including unconventional, conventional and hybrid plays. It will also take account of Coal Bed Methane (CBM) and Underground Coal Gasification (UCG) exploration, in addition to both near surface and deeper aquifers and groundwater. Outputs will include descriptions and visual representations of potential sources of sub-surface contamination of groundwater from different sources of hydrocarbons. These outputs are designed for use by the EA, Defra, other government departments, local planning authorities, environmental consultants and the public. The project will involve creating an attributed version of UK3D for England with source rock formations and aquifers identified. This report describes the hydrocarbon bearing units in England. The units have been identified primarily from three BGS reports commissioned by DECC (the Department for Energy and Climate Change) in 2013 (DECC, 2013a; 2013b; 2013c) and three additional area-specific reports on shale gas prospectivity in the Bowland Shale (Andrews, 2013), the Weald (Andrews, 2014) and the Wessex area (Greenhalgh, 2016). Note that this report is not intended to be an exhaustive summary of the occurrence of hydrocarbon units in England, rather a high-level overview for hydrogeologists interested in the potential for groundwater contamination. If further detailed information is required about the hydrocarbon characteristics of the units the reader should refer to the source documents (and references therein). The source documents identify units that have potential as conventional oil and gas reservoirs and source rocks (DECC, 2013a), for Coal Bed Methane (CBM) (DECC, 2013b) and shale gas (DECC, 2013c). There is no similar report for Underground Coal Gasification (UCG) and therefore coal units have been identified from (DECC, 2013b). This report gives a summary of the potential hydrocarbon resource types; identifies or attributes specific hydrocarbon source rocks on the Generalised Vertical Section (GVS), which identifies the main geologic units for England from BGS’ National Geological Model (NGM) (UK3D v2015 and Waters et al., 2016); and, summarises features