Natural gas hydrate (NGH) is a clean energy with huge potential reserves. Therefore, it is essential to understand the hydrate formation and dissociation characteristics for NGH production. Methane hydrate formation under gas migration condition was studied as pre-exploratory step for hydrate reformation research. Vessel pressure changes, methane hydrate saturation (S_h) and residual aqueous water saturation (S_w) were measured and analyzed in this study. Residual aqueous water distribution is also illustrated by magnetic resonance imaging (MRI). We found that, when S_w0 was higher than 0.4, the capillary force affected the aqueous water migration more than when S_w0 was lower than 0.4. Hence, S_h-max had a positive correlation with S_w0 when S_w0 is lower than 0.4. In addition, an upward methane flow is more likely to cause aqueous water redistribution than a downward methane flow. Moreover, we found that the aqueous water distribution changes could not recover after hydrate dissociation. Furthermore, the shifting of the hydrate dissociation boundaries from the vessel wall towards the core can be observed from the MRI images.

天然气水合物（NGH）是一种清洁能源，具有巨大的潜在储量。因此，了解NGH生产中水合物的形成和解离特性至关重要。研究了天然气运移条件下甲烷水合物的形成，作为水合物重整研究的前期探索步骤。在这项研究中，对容器压力变化，甲烷水合物饱和度（S _h）和残留水饱和度（S _w）进行了测量和分析。残留水的水分布也通过磁共振成像（MRI）进行了说明。我们发现，当S _w0高于0.4时，毛细力对含水水迁移的影响要大于当S _w0低于0.4时。因此，S _h-max当S _w0小于0.4时，与S _w0正相关。另外，向上的甲烷流比向下的甲烷流更容易引起水的再分配。此外，我们发现水合物离解后，水的水分布变化无法恢复。此外，可以从MRI图像中观察到水合物解离边界从血管壁向核心的移动。