Loading…
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...
Saved in:
Published in: | Geophysical research letters 2015-11, Vol.42 (21), p.9279-9284 |
---|---|
Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
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 |