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CO 2 wettability of caprocks: Implications for structural storage capacity and containment security

Structural trapping, the most important CO 2 geostorage mechanism during the first decades of a sequestration project, hinges on the traditional assumption that the caprock is strongly water wet. However, this assumption has not yet been verified; and it is indeed not generally true as we demonstrat...

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Bibliographic Details
Published in:Geophysical research letters 2015-11, Vol.42 (21), p.9279-9284
Main Authors: Iglauer, Stefan, Al‐Yaseri, Ahmed Zarzor, Rezaee, Reza, Lebedev, Maxim
Format: Article
Language:English
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Summary:Structural trapping, the most important CO 2 geostorage mechanism during the first decades of a sequestration project, hinges on the traditional assumption that the caprock is strongly water wet. However, this assumption has not yet been verified; and it is indeed not generally true as we demonstrate here. Instead, caprock can be weakly water wet or intermediate wet at typical storage conditions; and water wettability decreases with increasing pressure or temperature. Consequently, a lower storage capacity can be inferred for structural trapping in such cases. Caprocks are intermediate wet or weakly water wet at typical storage conditions CO 2 wettability increases with pressure and thus depth Structural storage capacities are significantly lower than previously predicted
ISSN:0094-8276
1944-8007
DOI:10.1002/2015GL065787