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• W2964508044 abstract "This report details a reconnaissance investigation carried out between 2016 and 2018 from a BritishGeological Survey (BGS)–Environment Agency (EA) collaboration on the impacts of abandonedhydrocarbon (HC) wells on groundwater quality in England. The investigation involved collation of adatabase of HC wells that were identified from records provided by DECC (Department of Energy &Climate Change; now BEIS: Business, Energy & Industrial Strategy) as being abandoned (as opposedto operational or unspecified), categorising according to factors such as oil or gas designation, depth ofHC resource, time since abandonment, productive life, absence of active wells nearby, and occurrenceand type of overlying aquifer(s). From this categorisation, a subset of 27 sites were shortlisted for furtherinvestigation and fact sheets were produced for each outlining regional geology, hydrogeology andpotential groundwater monitoring points in the area. Using these factsheets, four study areas wereassessed as being most suitable for further field investigation. These comprised two gas fields: NooksFarm (Staffordshire), and Ashdown (Sussex), and two oil fields: Hemswell (Lincolnshire) and Lomer(Hampshire).Groundwater sampling campaigns were conducted in 2016–2017 in the four study areas, with potentialsampling points identified within a 5 km buffer zone around (downstream of) the HC well or HC field.In several areas, the number of sampling points was very limited as locations of HC wells do notnecessarily have any relationship with locations of overlying aquifers. In others, large numbers of siteswere deemed unsuitable for sampling, for reasons including disuse, decommissioning, safety or lack ofaccess. This made representative sampling of groundwater a severe challenge. Suitable sites from thefour study areas were sampled twice during the project, with a total of 48 groundwater samples beingcollected over the two campaigns.Results from both sampling rounds have shown that the presence of hydrocarbons in the groundwateris limited. In the first sampling round, a maximum dissolved methane (CH4) concentration of 407 μg/Lwas recorded. However, this relatively high value was not repeated when the site was visited during thesecond round of groundwater sampling. The value was below the threshold required for δ13CCH4 isotopicanalysis. Some groundwater samples showed detectable quantities of organic compounds includingVOCs (volatile organic compounds) and PAHs (polycyclic aromatic hydrocarbons) as well aspesticides, herbicides, fungicides, surfactants, analgesics and veterinary compounds. These were,however, almost invariably present in low concentrations, none could be linked unequivocally to thepresence of abandoned HC wells and many were clearly due to other anthropogenic activities.As a result of the difficulties finding representative and suitable groundwater sampling sites, a furtherreconnaissance was undertaken in May 2017 to identify potential alternative gas and oil fields. Thisconfirmed further the difficulties in finding suitable areas for investigating groundwater quality andfurther groundwater sampling was therefore not attempted. An alternative approach was used toinvestigate two abandoned HC well areas: Ashdown, one of the original study areas, and a new locationat Bolney (also Sussex). A soil gas survey was completed at each of these locations in order toinvestigate whether soil gas proximal to the former well location contained any evidence of HC leakage.Due to poor ground conditions at the time of sampling, the results are ambiguous, but do show elevatedconcentrations of both CO2 and CH4. Further work in dry ground conditions would be required to saywith certainty that these concentrations are linked directly to the presence of the gas wells." @default.
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• W2964508044 date "2018-01-01" @default.
• W2964508044 modified "2023-09-26" @default.
• W2964508044 title "Impacts on groundwater quality from abandoned hydrocarbon wells - final report" @default.
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