关键词: 水合物, 甲烷, 相平衡, 砂岩, NaCl, 储量预测

Abstract: Natural gas hydrate, as a new type energy, 90% of them exists in the Marine environment. While Submarine sandstone hydrate, as one of the many hydrate types, has the highest reserves and the best quality. Therefore it has the most development value. This paper introduced and analyzed the influencing factors and reserves prediction of seabed sandstone hydrate formation. In terms of influencing factors, the effects of seabed sandstone particle size, seabed sandstone interface characteristics, salt concentration and gas composition on sandstone hydrate formation were discussed and also analyzed the reasons for its impact. In terms of reserves prediction, the research on exploration field and numerical analysis is summarized, and it pointed out the most suitable solution for predicting the sandstone hydrate reserves. In addition, the research directions in future on hydrate reserve prediction are also proposed. Firstly, there is no uniform conclusion on the effect of seafloor sandstone particle size on hydrate. This may be due to the fact that different scholars do not have a uniform division of particle size range. Therefore unified for the influence of seafloor sandstone porosity on hydrate is studied. Secondly, a function of salt concentration in seawater as a function of the submarine sandstone depth needs to be established, so that hydrate reserves can be predicted more accurately.

Key words: Hydrate, Methane, Phase equilibria, Sandstone, NaCl, Reserves prediction