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dc.contributor.authorFalcon-Suarez, Ismael
dc.contributor.authorLivo, Kurt
dc.contributor.authorCallow, Ben
dc.contributor.authorMarin-Moreno, Héctor
dc.contributor.authorPrasad, Manika
dc.contributor.authorBest, Angus
dc.date.accessioned2020-10-08T16:04:44Z
dc.date.available2020-10-08T16:04:44Z
dc.date.created2020-10-07T21:48:38Z
dc.date.issued2020
dc.identifier.citationScientific Reports. 2020, 10 (1), .
dc.identifier.issn2045-2322
dc.identifier.urihttps://hdl.handle.net/11250/2681856
dc.description.abstractSequestration of industrial carbon dioxide ( CO 2) in deep geological saline aquifers is needed to mitigate global greenhouse gas emissions; monitoring the mechanical integrity of reservoir formations is essential for effective and safe operations. Clogging of fluid transport pathways in rocks from CO 2-induced salt precipitation reduces injectivity and potentially compromises the reservoir storage integrity through pore fluid pressure build-up. Here, we show that early warning of salt precipitation can be achieved through geophysical remote sensing. From elastic P- and S-wave velocity and electrical resistivity monitoring during controlled laboratory CO 2 injection experiments into brine-saturated quartz-sandstone of high porosity (29%) and permeability (1660 mD), and X-ray CT imaging of pore-scale salt precipitation, we were able to observe, for the first time, how CO 2-induced salt precipitation leads to detectable geophysical signatures. We inferred salt-induced rock changes from (i) strain changes, (ii) a permanent ~ 1.5% decrease in wave velocities, linking the geophysical signatures to salt volume fraction through geophysical models, and (iii) increases of porosity (by ~ 6%) and permeability (~ 7%). Despite over 10% salt saturation, no clogging effects were observed, which suggests salt precipitation could extend to large sub-surface regions without loss of CO 2 injectivity into high porosity and permeability saline sandstone aquifers.
dc.language.isoeng
dc.titleGeophysical early warning of salt precipitation during geological carbon sequestration
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersion
dc.source.pagenumber14
dc.source.volume10
dc.source.journalScientific Reports
dc.source.issue1
dc.identifier.doi10.1038/s41598-020-73091-3
dc.identifier.cristin1838059
dc.relation.projectNorges forskningsråd: 280472
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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