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Injection of CO2-saturated brine in geological reservoir: A way to enhanced storage safety
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
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Number of Authors: 6
2016 (English)In: International Journal of Greenhouse Gas Control, ISSN 1750-5836, E-ISSN 1878-0148, Vol. 54, 129-144 p.Article in journal (Refereed) Published
Abstract [en]

Injection of free-phase supercritical CO2 into deep geological reservoirs is associated with risk of considerable return flows towards the land surface due to the buoyancy of CO2, which is lighter than the resident brine in the reservoir. Such upward movements can be avoided if CO2 is injected in the dissolved phase (CO2aq). In this work, injection of CO2-saturated brine in a subsurface carbonate reservoir was modelled. Physical and geochemical interactions of injected low-pH CO2-saturated brine with the carbonate minerals (calcite, dolomite and siderite) were investigated in the reactive transport modelling. CO2-saturated brine, being low in pH, showed high reactivity with the reservoir minerals, resulting in a significant mineral dissolution and CO2 conversion in reactions. Over the injection period of 10yr, up to 16% of the injected CO2 was found consumed in geochemical reactions. Sorption included in the transport analysis resulted in additional quantities of CO2 mass stored. However, for the considered carbonate minerals, the consumption of injected CO2aq was found mainly in the form of ionic trapping.

Place, publisher, year, edition, pages
2016. Vol. 54, 129-144 p.
Keyword [en]
Injection of CO2-saturated brine, Geological storage, Carbonate reservoir, Carbonate mineral reactions, Ionic trapping, Enhanced storage safety, GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-137756DOI: 10.1016/j.ijggc.2016.08.028ISI: 000387781500010OAI: oai:DiVA.org:su-137756DiVA: diva2:1064259
Available from: 2017-01-12 Created: 2017-01-10 Last updated: 2017-01-12Bibliographically approved

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Jarsjö, Jerker
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Department of Physical Geography and Quaternary Geology
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CiteExportLink to record
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Citation style
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  • de-DE
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  • en-US
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  • nn-NO
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Output format
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