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The critical evaluation of carbon dioxide subsurface storage sites; geological challenges in the depleted fields of Liverpool Bay

Lauren Chedburn, John R. Underhill, Sam Head and Rachel Jamieson
The critical evaluation of carbon dioxide subsurface storage sites; geological challenges in the depleted fields of Liverpool Bay
AAPG Bulletin (September 2022) 106 (9): 1753-1789

Abstract

Depleted hydrocarbon fields in the Liverpool Bay area of the United Kingdom East Irish Sea have been earmarked as sites for the geological storage of CO (sub 2) . Cessation of production at the Hamilton field means that it will soon be available for storage and has led to its inclusion in the United Kingdom's first (track 1) carbon capture, utilization, and storage cluster sequencing that underpins efforts to decarbonize onshore emitters (HyNet project). The interpretation of well-calibrated, proprietary three-dimensional seismic data has enabled critical assessment of the geological controls on CO (sub 2) storage in the area. Our mapping demonstrates that significant portions of the fields lie shallower than the 800-m depth threshold, above which lower pressures and temperatures prevent CO (sub 2) from being stored in the most efficient supercritical phase, significantly reducing storage capacity during the early phases of injection. Furthermore, an assessment of the Mercia Mudstone Group seal highlights the presence of a gas-bearing basal Ansdell Mudstone Member to the Ormskirk Sandstone Formation reservoirs forming a waste zone that extends the reservoir section to even shallower levels. The mapping of faults to near seabed and progressive younging and shallowing of the ultimate top seal resulting from a progressive pinch-out of halite horizons in the Mercia Mudstone Group raise additional questions about the integrity of the top seal in southern parts of the basin. Taken together, our results flag a number of technical issues, cast some geological doubt on, and highlight a need to understand the impacts of using fields in Liverpool Bay for carbon storage upon which the HyNet project depends.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 106
Serial Issue: 9
Title: The critical evaluation of carbon dioxide subsurface storage sites; geological challenges in the depleted fields of Liverpool Bay
Affiliation: Heriot-Watt University, Centre for Exploration Geoscience, Edinburgh, United Kingdom
Pages: 1753-1789
Published: 202209
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 119
Accession Number: 2022-047950
Categories: Applied geophysicsEngineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., 2 tables, geol. sketch maps
N53°00'00" - N55°00'00", W04°00'00" - W03°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 202236
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