论文部分内容阅读
采用显微激光拉曼光谱对我国在南海神狐海域及祁连山冻土区首次钻获的天然气水合物实物样品进行了详细的研究,探讨了其笼型结构特征及其气体组成.结果表明,南海神狐海域天然气水合物样品是典型的I型结构(sI)水合物,气体组分主要是甲烷,占99%以上;水合物大笼的甲烷占有率大于99%,小笼为86%,水合指数为5.99.祁连山冻土区天然气水合物气体组分相对复杂,主要成分除甲烷外(70%左右),还有相当数量的乙烷、丙烷及丁烷等烃类气体,从拉曼谱图上可初步判断其为II型结构(sII)水合物;水合物的小、大笼的甲烷占有率的比值(θS/θL)为26.38,远远大于南海神弧海域水合物的0.87,这主要是由于祁连山水合物气体组分中的大分子(乙烷、丙烷及丁烷等)优先占据水合物的大笼,大大减少了大笼中甲烷分子的数量.
The microscopic laser Raman spectroscopy was used to study the physical samples of natural gas hydrate first time in Shenhu sea area and Qilian mountain permafrost area of China, and its cage structural characteristics and gas composition were discussed. The results show that the South China Sea The natural gas hydrate samples of Shenhu sea area are typical Type I (sI) hydrates, with the major gas components being methane, accounting for over 99%; the large hydrate cages accounting for more than 99% of methane and the small cages being 86% The index is 5.99.The gas components of gas hydrate in Qilian Mountains permafrost are relatively complex, the main components except methane (about 70%), there are a considerable amount of ethane, propane and butane and other hydrocarbon gases from Raman spectroscopy (SII) hydrate; the ratio of hydrate to small and big cage methane (θS / θL) is 26.38, which is much larger than 0.87 of the hydrate of the Shencao sea area in the South China Sea, which is mainly It is due to the fact that macromolecules (ethane, propane and butane, etc.) in the gas composition of the Qilian Mountains preferentially occupy large cages of hydrates, greatly reducing the number of methane molecules in the large cages.