CO2 wettability of caprocks: Implications for structural storage capacity and containment security
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Open access
Authors
Iglauer, Stefan
Al-Yaseri, Ahmed
Rezaee, M. Reza
Lebedev, Maxim
Date
2015Type
Journal Article
Metadata
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Iglauer, S. and Al-Yaseri, A. and Rezaee, M.R. and Lebedev, M. 2015. CO2 wettability of caprocks: Implications for structural storage capacity and containment security. Geophysical Research Letters. 42 (21): pp. 9279-9284.
Source Title
Geophysical Research Letters
ISSN
School
Department of Exploration Geophysics
Remarks
Copyright © 2015 American Geophysical Union
Collection
Abstract
© 2015. American Geophysical Union. All Rights Reserved. Structural trapping, the most important CO2 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.