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Controls on fracture openness and reactivation in Forsmark, Sweden
Univ Rennes, CNRS, Geosci Rennes, UMR 6118, 263 Ave Gen Leclerc, F-35042 Rennes, France..
Itasca Consultants SAS, 29 Ave Joannes Masset, F-69009 Lyon, France..
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering.ORCID iD: 0000-0001-9251-5367
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics. Swedish Nucl Fuel & Waste Management Co SKB, Box 3091,Evenemangsgatan 13, S-16903 Solna, Sweden..ORCID iD: 0000-0002-4399-9534
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2023 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 13, no 1, article id 6686Article in journal (Refereed) Published
Abstract [en]

In crystalline bedrock, the open fraction of the fracture network constitutes the main pathways for fluids. Many observations point out that the state of stress influences the open fraction, likely indicating recent reactivation. But how this occurs is still unresolved. We analyse the conditions for fracture reactivation from fracture data collected in the uppermost 1 km of bedrock in Forsmark, Sweden. The open fraction is mainly correlated to the stress acting normally on the fracture but even away from critical failure, leading us to analyse the potential fluid pressure required for reactivation, P-c. We observe that 100% of the fractures are open when P-c is hydrostatic, and the ratio decreases exponentially to a plateau of similar to 17% when P-c is lithostatic and above. Exceptions are the oldest fractures, having a low open fraction independent of P-c. We suggest that these results reflect past pressure build-ups, potentially related to recent glaciations, and developing only if the preexisting open fraction is large enough.

Place, publisher, year, edition, pages
Springer Nature , 2023. Vol. 13, no 1, article id 6686
National Category
Geophysical Engineering
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URN: urn:nbn:se:kth:diva-330489DOI: 10.1038/s41598-023-33619-9ISI: 000997547300054PubMedID: 37095154Scopus ID: 2-s2.0-85153687376OAI: oai:DiVA.org:kth-330489DiVA, id: diva2:1778130
Note

QC 20230630

Available from: 2023-06-30 Created: 2023-06-30 Last updated: 2023-08-10Bibliographically approved

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Selroos, Jan-OlofIvars, Diego Mas

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