孔隙分布对于水合物生成与分解的影响规律研究

Impact of pore distribution on hydrate formation and dissociation

岩层中不同孔隙分布对于水合物的生成与分解会产生显著影响,进而影响到岩层物性。已有水合物生成与分解实验大多使用均匀孔隙分布岩样,缺乏针对孔隙分布的研究,因此,开展不同孔隙分布对于水合物开采效率的影响研究就显得十分必要与紧迫。通过使用不同孔隙分布的砂岩样品,研究了孔隙分布对于水合物生成与分解的影响规律,考察了孔隙连通性、大小孔隙占比对于水合物生成分解速率以及含水饱和度的影响。实验结果表明孔隙连通性是水合物在砂岩中生成速率的重要影响因素,同时束缚水饱和度与水饱和度呈现一定范围内的比例变化,进一步揭示了孔隙分布对于水合物生成的重要影响。

The formation and dissociation of hydrates are significantly affected by different pore distributions in rock strata,and then the physical properties of rock strata are affected.The existing experiments on hydrate formation and dissociation mostly use rock samples with uniform pore distribution,and there is a lack of research on pore distribution.Therefore,it is necessary and urgent to carry out the research on the impact of different pore distribution on hydrate exploitation efficiency.The rules of impact of pore distribution on hydrate formation and dissociation were studied by using sandstone samples with different pore distribution,and the effects of pore connectivity,proportions of large and small pores on water saturation and hydrate formation and dissociation rate were investigated.The experimental results show that the pore connectivity is the key factor affecting the hydrate formation rate in sandstone,and the ratio of bound water saturation and water saturation changes within a certain range,it further reveals the important impact of pore distribution on hydrate formation.