1. Jurassic shales of the Weald Basin: geology and resource estimation Robert Gatliff (BGS) Director Energy & Marine Geoscience Presenting on behalf of the BGS-DECC team

2. Area studied

3. Area already has conventional hydrocarbons Green = oil fields; red = gas fields Yellow = currently licensed

4. How BGS calculated the shale resource in the Weald Wells (oil/gas and other types) to identify the tops and bottoms of the main shale layers (of which 5) 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

5. Wells studied Black = key wells; blue = other wells

6. Seismic

7. Area prospective for shale oil

8. Estimate of oil in-place 2.20 – 8.57 billion bbl (293 – 1,143 billion tonnes) (P90 – P10) This is an in-place resource not a reserve Drilling and testing of new wells is required to confirm this model especially in areas of poor well control, and to assess the feasibility of production

9. Where to get more information www.gov.uk/oil-and-gas-onshore- exploration-and-production www.bgs.ac.uk/shalegas