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dc.contributor.authorSkurtveit, Elin
dc.contributor.authorSundal, Anja
dc.contributor.authorBjørnarå, Tore Ingvald
dc.contributor.authorSoldal, Magnus
dc.contributor.authorSauvin, Guillaume
dc.contributor.authorZuchuat, Valentin
dc.contributor.authorMidtkandal, Ivar
dc.contributor.authorBraathen, Alvar
dc.date.accessioned2020-11-24T14:22:36Z
dc.date.available2020-11-24T14:22:36Z
dc.date.created2020-05-22T09:14:17Z
dc.date.issued2020
dc.identifier.citationJournal of Geophysical Research (JGR): Solid Earth. 2020, .
dc.identifier.issn2169-9313
dc.identifier.urihttps://hdl.handle.net/11250/2689389
dc.description.abstractFracture stiffness and flow properties have been measured in the laboratory using naturally fractured fault rock samples from the Little Grand Wash fault, Utah, USA. We compare fracture closure and related flow change during isotropic loading of two fractures which have been subject to various amounts of paleo‐reactive flow. The two tested fractures are described as (i) a small‐aperture fracture (0.1 mm) with negligible geochemical alterations of the fracture surface and (ii) a large‐aperture fracture (0.53 mm) where precipitates are observed on the fracture surface. X‐ray imaging is used for quantification of fracture aperture and fracture surface contact distribution. The petrographical characterisation using scanning electron microscopy and x‐ray powder diffraction is performed pre‐test and describes burial and uplift diagenesis as well as pulses of reactive fluid flow within the fault. The stress dependent flow and deformation experiment provides new data on fracture stiffness and flow for naturally developed fractures in siliciclastic rock. Fracture stiffness is found to be highest for the small‐aperture fracture due to its high fracture contact ratio and well‐developed surface mating during closure. For the naturally altered and rougher, large‐aperture fracture, fracture stiffness is lower and a highly stress dependent decay in flow is observed during initial closure. The results illustrate that a natural fracture with high contact ratio and well mated surfaces will close during loading, whereas a fracture associated with high flow rates and affected by previous geochemical alteration maintains a high flow rate compared to the host rock during similar loading.
dc.description.abstractExperimental investigation of natural fracture stiffness and flow properties in a faulted CO2 bypass system (Utah, USA)
dc.language.isoeng
dc.titleExperimental investigation of natural fracture stiffness and flow properties in a faulted CO2 bypass system (Utah, USA)
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersion
dc.source.pagenumber17
dc.source.journalJournal of Geophysical Research (JGR): Solid Earth
dc.identifier.doi10.1029/2019jb018917
dc.identifier.cristin1812106
dc.relation.projectNorges forskningsråd: 295061
dc.relation.projectNorges forskningsråd: 257579
dc.relation.projectNorges forskningsråd: 244049
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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