Effect of Variable Brine Salinities on CO2 Trapping: Implications for CO2 Storage in Saline Acquires

Haiyang Zhang, Mohammed Al Kobaisi, Yihuai Zhang, Muhammad Arif

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    10 Scopus citations

    Abstract

    Injecting CO2 into the saline aquifer is considered to be an effective strategy to mitigate CO2 emissions. Saline aquifers are known to have a wide range of salinities and several evidences showed that different brine salinities give rise to different CO2-brine-rock wetting behaviors as well as different CO2 solubility potential. This will ultimately influence the CO2 plume migration behavior and the overall performance of a CO2 sequestration project. However, associated field-scale CO2 capacity predictions in different saline aquifers received little attention. This study conducts field-scale numerical simulations to analyze the effect of aquifer salinity on the CO2 storage potential. Different CO2-brine flow behaviors undervariablebrine salinities were considered. The results showed that an increase in the plume migration distance was observed in a higher salinity aquifer.While an increase in the brine salinity would result in an increase in residual trapping but a decreased solubility trapping capacities.Also, higher salinity formation observed more mobile CO2 and thus exhibit a worse sealing efficiency. We point out that residual trapping capacity evaluation should consider both residual CO2 saturation and the CO2 occupied volume, which both are strong functions of brine salinity.

    Original languageBritish English
    Title of host publicationSociety of Petroleum Engineers - SPE Reservoir Characterisation and Simulation Conference and Exhibition 2023, RCSC 2023
    ISBN (Electronic)9781613999738
    DOIs
    StatePublished - 2023
    Event2023 SPE Reservoir Characterisation and Simulation Conference and Exhibition, RCSC 2023 - Abu Dhabi, United Arab Emirates
    Duration: 24 Jan 202326 Jan 2023

    Publication series

    NameSociety of Petroleum Engineers - SPE Reservoir Characterisation and Simulation Conference and Exhibition 2023, RCSC 2023

    Conference

    Conference2023 SPE Reservoir Characterisation and Simulation Conference and Exhibition, RCSC 2023
    Country/TerritoryUnited Arab Emirates
    CityAbu Dhabi
    Period24/01/2326/01/23

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