Extensive efforts have been made regarding gas hydrate sample reconstruction in the laboratory for a better understanding and development of natural gas resources. Magnetic resonance imaging (MRI) is a useful method for directly observing the reconstruction of methane hydrate, yet relevant studies remain limited. In this study, a 9.4-T 400-MHz MRI instrument was employed to investigate CH₄ hydrate formation in porous media involving various initial water saturation levels and sand diameters. Pressure histories and MRI signal variations were monitored to discuss the process of CH₄ hydrate growth, and the three main formation stages of induction, rapid growth, and slow formation were determined. Furthermore, the liquid water performance in MRI micro-images was analyzed to predict the characteristics of CH₄ hydrate formation. The results indicated that CH₄ hydrate formed in a spatially and temporally random manner and that pore plugging occurred owing to the residual water encased in grown hydrate. Additionally, phase saturations, water conversion percentages, and formation rates were defined to evaluate the effect of sand diameter and initial water saturation on CH₄ hydrate formation. With the reduction in the diameter of quartz glass beads from 400 μm to 100 μm, the average hydrate formation rate increased from 0.0010 min⁻¹ to 0.0034 min⁻¹, respectively. When the initial water saturation decreased to the optimized value (0.22 in this study), the water conversion percentage and hydrate saturation increased.

为了更好地理解和开发天然气资源，实验室在天然气水合物样品的重建方面已经进行了广泛的努力。磁共振成像（MRI）是直接观察甲烷水合物重建的有用方法，但相关研究仍然有限。在这项研究中，使用9.4-T 400-MHz MRI仪器研究了涉及各种初始水饱和度和砂直径的多孔介质中CH ₄水合物的形成。监测压力历史和MRI信号变化以讨论CH ₄的过程确定了水合物的生长，并确定了诱导，快速生长和缓慢形成的三个主要形成阶段。此外，分析了MRI显微图像中的液态水性能，以预测CH ₄水合物形成的特征。结果表明，CH ₄水合物以时空随机的方式形成，孔堵塞是由于残留的水包裹在生长的水合物中而发生的。此外，定义了相饱和度，水转化率和地层形成速率，以评估砂直径和初始水饱和度对CH ₄水合物形成的影响。随着石英玻璃珠直径从400μm减小到100μm，平均水合物形成速率从0.0010 min增加^{− 1}至0.0034 min ^{− 1}。当初始水饱和度降至最佳值（本研究中为0.22）时，水转化率和水合物饱和度增加。