Long-Term Reaction Characteristics of CO2–Water–Rock Interaction: Insight into the Potential Groundwater Contamination Risk from Underground CO2 Storage

Yutaro Takaya, Kentaro Nakamura, Yasuhiro Kato

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    CO2 sequestration into saline aquifers is considered to be one of the most promising options for reducing industrial CO2 emissions to the atmosphere. However, there are still many uncertainties regarding the storage of CO2 in the subsurface because of a lack of knowledge about CO2–water–rock interaction within CO2 reservoirs and the potential risk of CO2 leakage. In this study, we construct a semi-open type experimental system that can reproduce the interactions under conditions close to those of actual CO2 reservoirs. Using the system, we conduct CO2–water–rock interaction experiments for 8 months to monitor the long-term reaction and the mobilization of harmful metal elements. Altered tuffaceous rock is used in the experiment because these tuffaceous rock formations (called “Green Tuff”) are a potential candidate for CO2 storage in Japan. The results show that the major-element water composition will converge to the point where host rock dissolution and secondary mineral precipitation are balanced; then, the interaction will proceed under a certain groundwater composition. In addition, we found that groundwater contamination by some metal elements (Ni, Ba, and Mn) may reach unsafe levels for drinking water as a result of CO2-water–rock interaction.

    Original languageEnglish
    Pages (from-to)93-100
    Number of pages8
    JournalResource Geology
    Volume68
    Issue number1
    DOIs
    Publication statusPublished - 2018 Jan 1

    Fingerprint

    Groundwater
    Contamination
    Rocks
    groundwater
    metal
    secondary mineral
    Metals
    tuff
    Industrial emissions
    rock
    carbon sequestration
    host rock
    leakage
    mobilization
    experiment
    drinking water
    dissolution
    aquifer
    Chemical analysis
    Aquifers

    Keywords

    • CCS
    • CO geochemical trapping
    • CO underground storage
    • groundwater contamination
    • water–rock interaction

    ASJC Scopus subject areas

    • Geology
    • Geochemistry and Petrology

    Cite this

    Long-Term Reaction Characteristics of CO2–Water–Rock Interaction : Insight into the Potential Groundwater Contamination Risk from Underground CO2 Storage. / Takaya, Yutaro; Nakamura, Kentaro; Kato, Yasuhiro.

    In: Resource Geology, Vol. 68, No. 1, 01.01.2018, p. 93-100.

    Research output: Contribution to journalArticle

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