Abstract In this study, we developed an in situ chamber to measure water permeability as a function of the methane hydrate (MH) habit in pore space using a two-dimensional glass micromodel by adding a methane-dissolved water source unit to prevent MH dissociation. This unit enabled us to adjust the amount of methane dissolved in the water by controlling the pressure and temperature. We simultaneously observed MH crystallization behavior and measured the water permeability of the porous media. The growth rate of MH and the pore habit formation changed with subcooling, ΔT. As ΔT increased, the shape of the pattern transformed from a hexagonal plate to a dendrite and hexagonal plate, and finally, to a dendrite. The glass pillar played a role in inhibiting the growth of dendritic patterns. The plugging process of the porous media following MH formation was also observed. We compared our results with various water permeability models of MH sediments and found that the nonempirical relative permeability (NRP) models showed relatively good agreement. This was likely because the NRP models enhanced the effect of the gas phase. However, a gap remains between the NRP model predictions and our experimental results. On the other hand, there was no possibility of agreement other than the NRP models because the gas phase was not included in the equation.

中文翻译：

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使用二维玻璃微模型同时测量水渗透率和甲烷水合物孔隙习性

摘要 在这项研究中，我们开发了一个原位室，通过添加溶解甲烷的水源单元来防止 MH 解离，使用二维玻璃微模型测量水渗透率作为孔隙空间中甲烷水合物 (MH) 习性的函数。该装置使我们能够通过控制压力和温度来调节溶解在水中的甲烷量。我们同时观察了 MH 结晶行为并测量了多孔介质的水渗透率。MH 的生长速率和孔隙习性的形成随过冷 ΔT 发生变化。随着 ΔT 的增加，图案的形状从六方板转变为枝晶和六方板，最后变成枝晶。玻璃柱在抑制树枝状图案的生长方面发挥了作用。还观察到了 MH 形成后多孔介质的堵塞过程。我们将我们的结果与 MH 沉积物的各种水渗透率模型进行了比较，发现非经验相对渗透率 (NRP) 模型显示出相对较好的一致性。这可能是因为 NRP 模型增强了气相的影响。然而，NRP 模型预测与我们的实验结果之间仍然存在差距。另一方面，除了 NRP 模型之外，不可能达成一致，因为方程中不包括气相。NRP 模型预测与我们的实验结果之间仍然存在差距。另一方面，除了 NRP 模型之外，不可能达成一致，因为方程中不包括气相。NRP 模型预测与我们的实验结果之间仍然存在差距。另一方面，除了 NRP 模型之外，不可能达成一致，因为方程中不包括气相。