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Optimizing CO 2 Hydrate Sequestration in Subsea Sediments through Cold Seawater Pre-Injection

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  • Zhaobin Zhang

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institute of Earth Sciences, Chinese Academy of Sciences, Beijing 100049, China
    College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Yuxuan Li

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institute of Earth Sciences, Chinese Academy of Sciences, Beijing 100049, China
    College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Zhuoran Xie

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institute of Earth Sciences, Chinese Academy of Sciences, Beijing 100049, China
    College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Shouding Li

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institute of Earth Sciences, Chinese Academy of Sciences, Beijing 100049, China
    College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Jianming He

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institute of Earth Sciences, Chinese Academy of Sciences, Beijing 100049, China
    College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Xiao Li

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institute of Earth Sciences, Chinese Academy of Sciences, Beijing 100049, China
    College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Cheng Lu

    (China Geological Survey, Ministry of Natural Resources, Beijing 100037, China)

  • Xuwen Qin

    (China Geological Survey, Ministry of Natural Resources, Beijing 100037, China)

Abstract

Carbon sequestration technology offers a solution to mitigate excessive carbon dioxide emissions and sustainable development in the future. This study proposes a method for subsea carbon sequestration through the injection of cold seawater to promote CO 2 hydrate formation. Using a self-developed simulator, we modeled and calculated the long-term sequestration process. The study focuses on analyzing the thermal regulation of the seabed following cold seawater injection, the multiphysical field evolution during CO 2 injection and long-term sequestration, and the impact of seawater injection volumes on sequestration outcomes. The feasibility and leakage risks of this method were evaluated on a 100,000-year timescale. Results indicate that the injection of cold seawater significantly improves the pressure–temperature conditions of subsea sediments, facilitating early hydrate formation and markedly increasing the initial CO 2 hydrate formation rate. Consequently, the distribution pattern of hydrate saturation changes, forming a double-layer hydrate shell. Over the long term, while cold seawater injection does not significantly reduce CO 2 leakage, it does increase the safety margin between the hydrate layer and the seabed, enhancing the safety coefficient for long-term CO 2 hydrate sequestration. Through detailed analysis of the behavior of CO 2 components during sequestration, this study provides new theoretical insights into subsea CO 2 hydrate storage.

Suggested Citation

  • Zhaobin Zhang & Yuxuan Li & Zhuoran Xie & Shouding Li & Jianming He & Xiao Li & Cheng Lu & Xuwen Qin, 2024. "Optimizing CO 2 Hydrate Sequestration in Subsea Sediments through Cold Seawater Pre-Injection," Sustainability, MDPI, vol. 16(19), pages 1-18, October.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:19:p:8548-:d:1490501
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    References listed on IDEAS

    as
    1. Zhang, Zhaobin & Xu, Tao & Li, Shouding & Li, Xiao & Briceño Montilla, Maryelin Josefina & Lu, Cheng, 2023. "Comprehensive effects of heat and flow on the methane hydrate dissociation in porous media," Energy, Elsevier, vol. 265(C).
    2. Niwa, Kentaro & Kosugi, Sanai & Saito, Takayuki & Kajishima, Takeo & Hamaogi, Kenji, 2005. "Correlations among the design factors of the CO2 ocean sequestration system, GLAD," Energy, Elsevier, vol. 30(11), pages 2308-2317.
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