Abstract CO2 sequestration technology is crucial for carbon capture and storage (CCS). This study explores the sequestration behavior of CO2 as a hydrate in depleted methane hydrate (MH)-bearing sediments. MH formation and dissociation, CO2 injection, and water injection processes are experimentally simulated using glass beads to evaluate the entire technological process. The effects of different parameters on CO2 hydrate formation are analyzed to evaluate hydrate-based CO2 sequestration technologies. The aqueous water distribution minimally changes during the gas hydrate formation and dissociation in this study. For all the cases considered, local hydrate formation channels are not generated at the axis or wall of the vessel during the CO2 injection process. The saturation of the CO2 hydrate and residual water after the CO2 hydrate formation is proportional to the initial reservoir water saturation. This is the first study to propose water injection to promote the formation of CO2 hydrates, which are beneficial for CO2 sequestration. The amount of injected water decreases as the CO2 hydrate saturation increases before the water injection. A qualitative analysis indicates increased formation of CO2 hydrates during the water injection and promotion of the CO2 sequestration.

中文翻译：

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枯竭甲烷水合物砂质储层中的 CO 2 封存

摘要 CO2 封存技术对于碳捕集与封存 (CCS) 至关重要。本研究探讨了 CO2 作为水合物在含耗尽甲烷水合物 (MH) 的沉积物中的封存行为。MH 形成和解离、CO2 注入和注水过程使用玻璃珠进行实验模拟，以评估整个技术过程。分析了不同参数对 CO2 水合物形成的影响，以评估基于水合物的 CO2 封存技术。在本研究中，在天然气水合物形成和分解过程中，水的分布变化很小。对于所有考虑的情况，在 CO2 注入过程中，不会在容器的轴或壁上产生局部水合物形成通道。CO2水合物形成后CO2水合物和残余水的饱和度与初始储层水饱和度成正比。这是第一项提出注水以促进 CO2 水合物形成的研究，这有利于 CO2 封存。注水量随着 CO2 水合物饱和度的增加而减少。定性分析表明在注水和促进 CO2 封存过程中 CO2 水合物的形成增加。