The abundant methane hydrates stored in marine sediments have been widely evaluated as a potential energy source. Understanding the gas and water production characteristics of methane hydrate-bearing marine sediments is critical for hydrates commercial exploitation. In this study, confining pressure was applied to simulate a sub-seafloor environment. Methane was repeatedly injected into cores to remold hydrate-bearing marine sediments with different hydrate saturation. The hydrate saturation increased from 10.6% to 21.6% as the water content increased from 8.9% to 22.2%. The results indicate that the higher the core water content, the greater the hydrate saturation and the longer the hydrate dissociation time. The gas production characteristics of hydrate-bearing sediments were severely affected by water and hydrates in pores. The results indicated that some hydrates and free gas were easily trapped by the surrounding soil, meaning that the hydrates were isolated and disconnected with the pore channels under confining pressure during depressurization. Thus, a second depressurization was conducted to achieve further gas production. For cores with different water contents, their water conversion percentage is approximately 20%. When the water content exceeded 16.7%, the water production was observed. The results of this study are meaningful for further related research and field production of marine hydrates.

储存在海洋沉积物中的大量甲烷水合物已被广泛评估为潜在能源。了解含甲烷水合物的海洋沉积物的天然气和水的生产特征对于水合物商业开发至关重要。在这项研究中，施加围压来模拟海底环境。将甲烷反复注入岩心中，以重塑具有不同水合物饱和度的含水合物海洋沉积物。随着水含量从8.9％增加到22.2％，水合物饱和度从10.6％增加到21.6％。结果表明，岩心含水量越高，水合物饱和度越大，水合物离解时间越长。含水沉积物的产气特征受到孔隙中水和水合物的严重影响。结果表明，一些水合物和自由气体容易被周围的土壤截留，这意味着在减压过程中，在封闭压力下水合物被分离并与孔隙通道断开。因此，进行第二次减压以实现进一步的气体产生。对于含水量不同的岩心，其水转化率约为20％。当水含量超过16.7％时，观察到水的产生。这项研究的结果对于进一步的相关研究和海洋水合物的现场生产是有意义的。进行第二次减压以进一步产生气体。对于含水量不同的岩心，其水转化率约为20％。当水含量超过16.7％时，观察到水的产生。这项研究的结果对于进一步的相关研究和海洋水合物的现场生产是有意义的。进行第二次减压以进一步产生气体。对于含水量不同的岩心，其水转化率约为20％。当水含量超过16.7％时，观察到水的产生。这项研究的结果对于进一步的相关研究和海洋水合物的现场生产具有重要意义。