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CO 2 wettability of caprocks: Implications for structural storage capacity and containment security
Author(s) -
Iglauer Stefan,
AlYaseri Ahmed Zarzor,
Rezaee Reza,
Lebedev Maxim
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl065787
Subject(s) - caprock , wetting , containment (computer programming) , trapping , environmental science , geology , petroleum engineering , materials science , computer science , composite material , programming language , ecology , biology
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.