In Cumbria and Northumberland, 16 sites have been sampled for methane in a number of different aquifers. The two main aquifers are Permo-Triassic sandstone and the Fell Sandstone and Border Group.
The shale units present in the Northumberland Trough are the Bowland Shale and other black shales of Visean to Tournaisian age that are typically interbedded with sandstone, siltstone and mudstone. These shales are thinner, shallower and not laterally extensive when compared to the Bowland Shale Formation in Lancashire and Yorkshire. Oil shale is present in the Tweed Basin, but at shallow depths. In the west of this region, the coal seams of the Pennine Coal Measures Group are reported to have potential for coal bed methane.
These summary results are from single sampling visits to each site as part of the methane baseline project. The data are summarised for the Cumbria and Northumberland region as a whole and also for individual aquifers, where enough data are available.
|Area||Concentration (mg/l)||Number of samples|
|Cumbria and Northumberland||0.0002||0.00065||1.434||16|
|Fell Sandstone and Border Group||0.0002||0.0002||0.0006||3|
No baseline data are available for Permo-Triassic sandstone or the Fell Sandstone and Border Group in this region.
Contact Dr George Darling for further information.