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In Situ Triaxial Testing To Determine Fracture Permeability and Aperture Distribution for CO2 Sequestration in Svalbard, Norway.

https://arctichealth.org/en/permalink/ahliterature290821
Source
Environ Sci Technol. 2018 Apr 17; 52(8):4546-4554
Publication Type
Journal Article
Date
Apr-17-2018
Author
Jeroen F Van Stappen
Redouane Meftah
Marijn A Boone
Tom Bultreys
Tim De Kock
Benjamin K Blykers
Kim Senger
Snorre Olaussen
Veerle Cnudde
Author Affiliation
UGCT-PProGRess, Department of Geology, Faculty of Sciences , Ghent University , Krijgslaan 281/S8 , 9000 Ghent , Belgium.
Source
Environ Sci Technol. 2018 Apr 17; 52(8):4546-4554
Date
Apr-17-2018
Language
English
Publication Type
Journal Article
Abstract
On Svalbard, Arctic Norway, an unconventional siliciclastic reservoir, relying on (micro)fractures for enhanced fluid flow in a low-permeable system, is investigated as a potential CO2 sequestration site. The fractures' properties at depth are, however, poorly understood. High resolution X-ray computed tomography (micro-CT) imaging allows one to visualize such geomaterials at reservoir conditions. We investigated reservoir samples from the De Geerdalen Formation on Svalbard to understand the influence of fracture closure on the reservoir fluid flow behavior. Small rock plugs were brought to reservoir conditions, while permeability was measured through them during micro-CT imaging. Local fracture apertures were quantified down to a few micrometers wide. The permeability measurements were complemented with fracture permeability simulations based on the obtained micro-CT images. The relationship between fracture permeability and the imposed confining pressure was determined and linked to the fracture apertures. The investigated fractures closed due to the increased confining pressure, with apertures reducing to approximately 40% of their original size as the confining pressure increased from 1 to 10 MPa. This coincides with a permeability drop of more than 90%. Despite their closure, fluid flow is still controlled by the fractures at pressure conditions similar to those at the proposed storage depth of 800-1000 m.
PubMed ID
29595248 View in PubMed
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