Abstract The permeability of methane hydrate (MH)-bearing sediments is closely related to the exploitation efficiency of MH deposits. During the exploitation of MHs, the stress state of hydrate-bearing reservoirs is complex, and stratum deformation may occur simultaneously. Both the change in the stress state and stratum deformation may influence the permeability of hydrate-bearing sediments. In this paper, a series of permeability measurement tests was conducted to study the influence of the effective confining pressure and triaxial compression process on the permeability of MH-bearing samples. The test results indicated that the permeability of hydrate-bearing samples was influenced by the effective confining pressure. With increasing effective confining pressure, the permeability of the pure sand sample gradually decreased. For the hydrate-bearing samples, the permeability was also influenced by the effective confining pressure. When the effective confining pressure reached a specific value, a sharp drop in the permeability of the hydrate-bearing samples occurred. The change in permeability might be caused by the increase in fine hydrate particles in the pore space. Based on the test results, the permeability of the hydrate-bearing samples was influenced by the triaxial compression process. During the shearing process, the permeability greatly increased when the axial strain reached a specific value. This phenomenon might be caused by the formation of a shear band. During the production of hydrates, controlling the change in stress applied to the hydrate particles could possibly promote production. Furthermore, the appearance of shear bands or fissures might also increase production by certain methods, such as the hydraulic fracturing process.

中文翻译：

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三轴加载过程中含甲烷水合物沉积物渗透性的实验研究

摘要 含甲烷水合物（MH）沉积物的渗透率与MH矿床的开采效率密切相关。MHs开发过程中，含水合物储层应力状态复杂，可能同时发生地层变形。应力状态的变化和地层变形都可能影响含水合物沉积物的渗透率。本文通过一系列渗透率测量试验研究了有效围压和三轴压缩过程对含MH样品渗透率的影响。试验结果表明，含水合物样品的渗透率受有效围压的影响。随着有效围压的增加，纯砂样品的渗透率逐渐降低。对于含水合物样品，渗透率也受有效围压的影响。当有效围压达到特定值时，含水合物样品渗透率急剧下降。渗透率的变化可能是由孔隙空间中细水合物颗粒的增加引起的。根据试验结果，含水合物样品的渗透率受三轴压缩过程的影响。在剪切过程中，当轴向应变达到特定值时，渗透率大大增加。这种现象可能是由剪切带的形成引起的。在水合物生产过程中，控制施加在水合物颗粒上的应力变化可能会促进生产。此外，