Storing carbon dioxide beneath the Moray Firth explored

Sandstone rocks deep beneath the Moray Firth are being examined for the storage of carbon dioxide emissions (carbon capture and storage).

This is the first time a consortium of Scottish Government and industry has funded (£290k) a study to test the suitability of a specific site for carbon storage.

The Captain Sandstone will be evaluated for its capacity, technical feasibility and commercial viability as a CO2 store by scientists at the Scottish Centre for Carbon Storage (SCCS).

This is essential to plan for long-term storage of CO2 and to meet national targets for carbon emissions reduction.

Target rock — Captain Sandstone

The target rock in the Moray Firth is buried more than half a mile below the sea bed and lies at least 30 miles into the North Sea. It is one of many sandstones filled with salt water that provide more than 95 per cent of potential CO2 storage capacity in the northern North Sea.

"The Captain Sandstone has the potential to store decades of CO2 output from a coal-fired power station, like the existing plant at Longannet or a future CCS project such as Hunterston or Peterhead. In contrast, the depleted oil and gas fields within the sandstone have capacity for only a few years of power station output."
Schematic showing elements of CCS infrastructure and relationship with geological structure
"Scotland has significant advantages for the development of Carbon Capture and Storage including knowledge and expertise in areas such as geology and engineering and in the North Sea oil and gas industry. We also have a tremendous offshore storage capacity and the outcome of this research will further increase our understanding of the potential for Scotland to take the lead in the development of Carbon Capture and Storage."

Survey, modelling and monitoring

Location map

New geological mapping and modelling of the Captain Sandstone is appraising the thickness, extent and fluid flow properties of the rock. The study will also address the challenges of CO2 injection and monitoring to assess suitability of this and other North Sea sandstones.

Computer modelling of CO2 injection into the rocks will test the storage site and its long-term performance to ensure CO2 remains permanently locked in.

To transport CO2 from industrial plant to the offshore region it is envisaged that natural gas pipelines may be re-used, or new pipelines could be constructed, leading to a CO2 network (similar to the existing oil and gas networks).

The research will be completed this year and the results will be available to inform the implementation of carbon storage in Scotland and northern England.

Scottish CCTS Development Study members

The Scottish Government and commercial organisations with operational interests in Scotland are funding the project: Ayrshire Power Ltd (a Peel Energy company); BG Group, Doosan Babcock; National Grid; npower; Schlumberger; Scottish and Southern Energy; ScottishPower; Senergy; Shell U.K; The Crown Estate; and Wood Mackenzie.

Contact

For more information, please contact Maxine Akhurst.