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<p>Carbon dioxide capture and storage (CCS), a method for capturing and storing emitted carbon dioxide, is being promoted as one of the efforts to reduce greenhouse gas emissions. The current mainstream CCS technology is aquifer storage, which involves injecting and trapping supercritical CO<sub>2</sub> beneath geological structures such as a rock layer with low permeability and barrier properties, and the number of suitable storage sites is limited. Recently, a storage method using the gas hydrate has been proposed. In this method, injected liquid CO<sub>2</sub> forms a self-sealing layer and the liquid CO<sub>2</sub> is stored beneath the hydrate-bearing layer, eliminating the need for a barrier layer and potentially expanding the storage area. In this study, CO<sub>2</sub> (liquid)/water two-phase fluid-solid coupled analyses are performed to investigate the deformation behavior of the seafloor. In the analysis, it is assumed that the hydrate-bearing layer with several meters thickness has already formed in the sand layer, and the ground stability during CO<sub>2</sub> injection and storage beneath the hydrate layer is focused on. An elasto-viscoplastic constitutive model is used for the hydrate-bearing sand layer, which takes into account the increased stiffness and creep properties due to hydrates. Simulations are carried out under different injection locations and pressure conditions to investigate the mechanical behavior of the sand layer and hydrate-bearing layer.</p>

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Numerical simulations on ground deformation during CO2 underground storage beneath hydrate-bearing sandy layer

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Sayuri Kimoto

摘要

Carbon dioxide capture and storage (CCS), a method for capturing and storing emitted carbon dioxide, is being promoted as one of the efforts to reduce greenhouse gas emissions. The current mainstream CCS technology is aquifer storage, which involves injecting and trapping supercritical CO2 beneath geological structures such as a rock layer with low permeability and barrier properties, and the number of suitable storage sites is limited. Recently, a storage method using the gas hydrate has been proposed. In this method, injected liquid CO2 forms a self-sealing layer and the liquid CO2 is stored beneath the hydrate-bearing layer, eliminating the need for a barrier layer and potentially expanding the storage area. In this study, CO2 (liquid)/water two-phase fluid-solid coupled analyses are performed to investigate the deformation behavior of the seafloor. In the analysis, it is assumed that the hydrate-bearing layer with several meters thickness has already formed in the sand layer, and the ground stability during CO2 injection and storage beneath the hydrate layer is focused on. An elasto-viscoplastic constitutive model is used for the hydrate-bearing sand layer, which takes into account the increased stiffness and creep properties due to hydrates. Simulations are carried out under different injection locations and pressure conditions to investigate the mechanical behavior of the sand layer and hydrate-bearing layer.