The distribution and morphology of natural gas hydrates in pores have significant impacts on the macroscale physical properties of hydrate-bearing sediments. This paper investigated hydrate morphology characteristics using a micromodel, and the memory effect was used to accelerate the hydrate formation process. It is found that the initial gas and water saturation play a significant role in hydrate occurrence patterns and growth habits. When water is the initial main continuous phase, the hydrate prefers to grow towards the center of pores during hydrate formation. When gas is the initial main continuous phase, hydrates grow towards the center of pores and along the wall, and the mass transfer happens between the water and gas phases. It can be realized that the hydrate occurrence pattern is determined by the growth habit, which is related to mass transfer. These findings provide a theoretical foundation for future natural gas hydrate development.

天然气水合物在孔隙中的分布和形态对水合物沉积物的宏观物理性质具有重要影响。本文利用微观模型研究了水合物的形态特征，并利用记忆效应加速了水合物的形成过程。研究发现，初始气水饱和度在水合物赋存模式和生长习性中起重要作用。当水是初始的主要连续相时，水合物在水合物形成过程中更倾向于向孔隙中心生长。当气体是初始的主要连续相时，水合物向孔隙中心和壁面生长，水相和气相之间发生传质。可以认识到，水合物的赋存方式是由生长习性决定的，这与传质有关。这些发现为未来天然气水合物的开发提供了理论基础。