甲烷水合物及其沉积层导热特性的研究现状

Research progress in the thermal conductivity of methane hydrate and methane hydrate-bearing sediments

总结了近年来国内外甲烷水合物及其沉积层导热特性的研究现状,从实验测试和模拟研究两方面分析了甲烷水合物及其沉积层的导热影响因素、相关规律和导热机理。研究结果表明:纯质水合物的导热性能与外界温度、压力、客体分子数量、多孔介质、笼形结构等因素有关,其值大小主要由主体水分子形成的笼形结构决定;而水合物沉积层导热系数的大小主要依赖于实验样品的组成成分、初始水饱和度、各组分分布,与温度、压力以及垂直有效应力关系不大。最后,指出了现存研究方法中一些值得改进的地方,并对今后的研究工作进行了展望。

The research progress at home and abroad in the thermal conductivity of methane hydrate and methane hydrate-bearing sediments was summarized in this paper.The influential parameters,thermal conduction laws and the associated mechanism were analyzed in view of experimental measurements and simulation.It could be concluded that the thermal conductivity of pure methane hydrate was associated with outside temperature,pressure,number of guest molecules,porous media,and frame structure.Its value depended on the frame structure by the host water molecules.The thermal conductivity of hydrate-bearing sediments was mainly determinant by the composition,initial water saturation and the distribution of each component.There was no relationship with temperature,pressure,and vertical effective stress.Finally,based on the discussions on thermal conductivity of methane hydrate and its bearing sediments,some potential problems and research directions have been put forward.