Seismic facies and hydrocarbon potential of carbonate reservoirs in ramp settings
Potential Geological Settings in the UKdavidsmythe.org/nuclear/Potential Geological Settings in the...
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Kingsley Dunham CentreKeyworthNottingham NG12 5GGTel 0115 936 3100© NERC All rights reserved
Potential Geological Settings in the UK
Richard ShawBritish Geological Survey
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UK Geology highly varied
Offers a number of disposal options for the geological disposal of radioactive waste
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Main CriteriaGeology contributes to long-term isolation of radioactive waste
Slow groundwater movement/low hydraulic gradients;
Ideally need:
Long groundwater return time;
Relatively simple, predictable groundwater flow regimes;
Physical stability (constructability/operational safety);
and……….Long term stability;
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Some other considerations……..may also consider:
Resources;
Climate change;
…………… and other factors.
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Favourable Geological SituationsBasement under sedimentary cover (BUSC)
Large inland sedimentary basins
Low permeability sedimentary rocksLow permeability ‘basement’ rocks
Many of these overlap
Low relief terrain (inc small islands)
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Favourable Geological SituationsBUSC
Well known model (Sellafield and Dounreay are variants)
Hosted in ‘basement’ with cover rocks potentially providing long flow paths and dilution.
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Favourable Geological SituationsLarge inland sedimentary basinsLikely to have disposal options in:
•Evaporite deposits;
•Basinal brines that are stagnant.
•Thick mudstone sequences;
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Favourable Geological SituationsLow permeability sedimentary rocks
Packages of sedimentary rocks with mudstone sections thick enough for construction of a repository
Offer potentially long migration pathways and traps in overlying deposits.
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Favourable Geological SituationsLow permeability basement (‘hard’) rocksRocks with low bulk rock permeability rocks at surface, regardless of surface relief
Potential problems of complex geology (sometimes) and short return pathways
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Favourable Geological SituationsLow relief terrain (inc small islands)
Includes basement and areas of cover rock.
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Less Suitable Geological Situations
Within an aquifer
High groundwater fluxes
Natural resources (coal etc)
High geological complexity
High seismicityActive volcanism
Not a current issue here but ……
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Deep Geological InformationInformation largely restricted to Coal and hydrocarbon exploration activities includingBoreholes
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Location of all registered boreholes greater than 1000m drilled depth (~1500 since 1850), those drilled post 1980 (~180) highlighted in red.
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Deep Geological InformationInformation largely restricted to Coal and hydrocarbon exploration activities includingBoreholesSeismic Surveys
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Hydrocarbon
On-shore seismic survey coverage
Coal
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Deep Geological InformationInformation largely restricted to Coal and hydrocarbon exploration activities includingBoreholesSeismic SurveysNational/Regional geophysical datasets including Gravity, magnetics etcSite specific data including Sellafield
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Given geological variability and the number of potentially suitable geological environments available in the UK the geological disposal of radioactive waste is a viable option.