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Pressure-derived storage efficiency for open saline aquifer CO (sub 2) storage

Sylvain Thibeau and Frank Adler
Pressure-derived storage efficiency for open saline aquifer CO (sub 2) storage
Geoenergy (March 2023) Pre-Issue Publication


Various approaches are used to evaluate the resources of saline aquifers to store CO (sub 2) at preliminary stage (before flow modeling studies). The two approaches most used are the volumetric "open aquifer" and "closed aquifer" approaches which provide endmembers of the resources of a given aquifer store. We propose a novel approach based on extending the analytical aquifer methods, routinely used for decades in the oil and gas industry, to CO (sub 2) saline aquifer storage. The CO (sub 2) storage resource is derived from the pore volume liberated by pressurization to accommodate CO (sub 2) in the store, which is the sum of (i) the volume of the store obtained by compression and (ii) the volume of water outflow towards the regional aquifer. It enables to estimate CO (sub 2) storage resources and storage efficiencies for pressure-limited stores (meaning when resource is not even more limited by CO (sub 2) migration issues). Formalism is presented as well as implications and limitations of the method. With this method, storage efficiencies are directly connected to closed store efficiencies that are corrected for the water outflux and pressure dissipation from the CO (sub 2) store into the regional aquifer, reconciling "closed" and "open" approaches. We present an application to Havnso saline aquifer structure in order to highlight consequences for CO (sub 2) storage resource evaluation and also for appraisal and development phases.

EISSN: 2755-1725
Serial Title: Geoenergy
Serial Volume: Pre-Issue Publication
Title: Pressure-derived storage efficiency for open saline aquifer CO (sub 2) storage
Affiliation: TotalEnergies, Centre Scientifique et Technique Jean Feger, Pau, France
Published: 20230321
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 18
Accession Number: 2023-038493
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 5 tables
N54°58'00" - N56°07'60", E10°55'00" - E12°48'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 2023
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