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The Carboniferous shales of the Midland Valley of Scotland: geology and resource estimation
Mike Stephenson (BGS)Director of Science and TechnologyPresenting on behalf of the BGS-DECC team
Area studied
Area has a proven hydrocarbon system
How BGS calculated the shale resource in the Midland Valley of Scotland
• Wells (oil/gas and other types) to identify the tops and bottoms of the main shale-bearing intervals
• Seismic sections to map rock layers in subsurface• 3D computer model to estimate the volume of shale• Studies of the burial and uplift history & of the
organic content of the shale to narrow down the layers and areas that might yield hydrocarbons
Wells/boreholes studied
Area prospective for shale oil
Area prospective for shale gas
Estimate of oil in-place• 3.2 – 11.2 billion barrels (421 – 1,497 million
tonnes) and a reasonable central estimate is6.0 billion barrels of oil (793 million tonnes)
• This is an in-place resource (oil in the rocks) not a reserve (what might be produced)
• Drilling and testing of new wells is required to assess the feasibility of production
Estimate of gas in-place• 49.4 – 134.6 trillion cubic feet (1.40 – 3.81
trillion cubic metres) and a reasonable central estimate is80.3 trillion cubic feet of gas (2.27 trillion cubic
metres) • This is an in-place resource (gas in the rocks)
not a reserve (what might be produced)• Drilling and testing of new wells is required to
assess the feasibility of production
Where to get more
informationwww.gov.uk/oil-and-gas-onshore-exploration-and-production
www.bgs.ac.uk/shalegas
Slides if needed for questions
Bowland-Hodder822 – 1,329 – 2,281 tcf gas
Weald2.2 – 4.4 – 8.6 billion bbl oil
Midland Valley of Scotland49.4 – 80.3 – 134.6 tcf gas
3.2 – 6.0 – 11.2 billion bbl oil
Historical oil-shale mines
Location of historical shale mines from http://www.scottishshale.co.uk/GazMines/MineMaps/AAMinesField.html
Area prospective for shale oil
Area prospective for shale gas