Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 21, Pages 9279-9284Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065787
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Funding
- Australian National Low Emissions Coal Research and Development (ANLEC RD) [3-0911-0155]
- Australian Coal Association Low Emissions Technology Limited
- Australian Government through the Clean Energy Initiative
- Iraqi Ministry of Higher Education and Scientific Research
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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.
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