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    Optimum storage depths for structural CO2 trapping

    Access Status
    Fulltext not available
    Authors
    Iglauer, Stefan
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Iglauer, S. 2018. Optimum storage depths for structural CO2 trapping. International Journal of Greenhouse Gas Control. 77: pp. 82-87.
    Source Title
    International Journal of Greenhouse Gas Control
    DOI
    10.1016/j.ijggc.2018.07.009
    ISSN
    1750-5836
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/71583
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier Ltd Structural trapping is the primary CO2geo-storage mechanism, and it has historically been quantified by CO2column heights, which can be permanently immobilized beneath a caprock, using a buoyancy force-capillary force balance. However, the high dependence of CO2-wettability (a key parameter in the above analysis) on pressure and temperature – and thus storage depth – has not been taken into account. Importantly, rock can be CO2-wet at high pressure, and this wettability reversal results in zero structural trapping below a certain storage depth (~2400 m maximum caprock depth for a most likely scenario is estimated here). Furthermore, more relevant than the CO2column height is the actual mass of CO2which can be stored by structural trapping (mCO2). This aspect has now been quantified here, and importantly, mCO2goes through a maximum at ~1300 m depth, thus there exists an optimal storage depth at around 1300 m depth.

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