Journal
ENVIRONMENTAL GEOLOGY
Volume 54, Issue 8, Pages 1677-1686Publisher
SPRINGER
DOI: 10.1007/s00254-007-0945-x
Keywords
leaky faults; leaky wellbores; CO2 sequestration; numerical simulation; pneumatic eruption
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Geologic storage of CO2 is expected to produce plumes of large areal extent, and some leakage may occur along fractures, fault zones, or improperly plugged pre-existing wellbores. A review of physical and chemical processes accompanying leakage suggests a potential for self-enhancement. The numerical simulations presented here confirm this expectation, but reveal self-limiting features as well. It seems unlikely that CO2 leakage could trigger a high-energy run-away discharge, a so-called pneumatic eruption, but present understanding is insufficient to rule out this possibility. The most promising avenue for increasing understanding of CO2 leakage behavior is the study of natural analogues.
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