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<identifier>oai:HAL:hal-00412332v1</identifier>
<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Changes in seal capacity of fractured claystone caprocks induced by dissolved and gaseous CO2 seepage</title>
<creator>Andreani, Muriel</creator>
<creator>Gouze, Philippe</creator>
<creator>Luquot, Linda</creator>
<creator>Jouanna, P.</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0094-8276</source>
<source>EISSN: 1944-8007</source>
<source>Geophysical Research Letters</source>
<publisher>American Geophysical Union</publisher>
<identifier>hal-00412332</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00412332</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00412332</source>
<source>Geophysical Research Letters, American Geophysical Union, 2008, 35 (14), pp.L14404. 〈10.1029/2008GL034467〉</source>
<identifier>DOI : 10.1029/2008GL034467</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1029/2008GL034467</relation>
<language>en</language>
<subject lang=en>argillaceous rocks</subject>
<subject lang=en>flow</subject>
<subject lang=en>dissolution</subject>
<subject lang=en>cohesion</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Claystone caprocks are often the ultimate seal for CO2 underground storage when residual CO2 gas reaches the reservoir top due to buoyancy. Permeability changes of a fractured claystone due to seepage of CO2-enriched brine and water vapor-saturated CO2 gas are investigated. Results show that brine flow induces a large porosity increase (up to 50%) in the vicinity of the fracture due to dissolution of calcite and quartz, while permeability remains unchanged. Conversely, cyclic flows of CO2-brine and CO2-gas increase the fracture aperture abruptly after each gas flow period, producing a progressive decrease of the caprock seal capacity. Aperture increase is controlled by decohesion of the clay framework within a micrometer-scale-thick layer induced by CO2-gas acidification. Results show that hydraulic aperture increases linearly with duration of the preceding CO2-brine flow period, emphasizing the kinetic control of the quartz grains dissolution during the brine flow periods.</description>
<date>2008</date>
</dc>
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