中文摘要：

甲烷水合物具有明显的拉曼光谱特征，但会受到压力和组成的影响，压力主要影响甲烷水合物拉曼峰强度，而组成会影响甲烷水合物的类型以及特征峰的拉曼位移。流体包裹体中甲烷水合物形成时的温度和压力是流体包裹体分析中的重要参数。采用原位拉曼光谱技术对南黄海盆地栖霞组地层石英脉中的天然CH4-H2O体系流体包裹体进行了分析。实验结果表明，利用激光拉曼光谱技术可以获得包裹体中甲烷水合物的拉曼光谱信号。该研究包裹体中的水合物为I型甲烷水合物，其形成温度为7．5℃（280．65K）；结合甲烷水合物相平衡关系计算得到包裹体中甲烷生成的压力为5．6MPa。原位拉曼光谱技术不仅可以准确识别甲烷水合物的类型，而且也可定量获取包裹体中水合物的生成条件。

英文摘要：

The methane hydrate is easy to be identified by laser Raman spectroscopy, which is influenced by the pressure and concentration of components. The pressure usually affects the intensities of Raman peak, and the change of concentration impacts on the type of methane hydrate and its Raman shifts. Forming conditions including pressure and temperature of methane hydrate in fluid inclusions are very important parameters to analysis of fluid inclusions. The nature fluid inclusions in CH4- H2O system from quartz vein of Qixia formation in South Yellow Sea Basin were analyzed by in situ Raman spectroscopy. The experimental results show that the methane hydrate in fluid inclusions can be tested by laser Raman spectroscopy. The hydrate in fluid inclusion is methane hydrate of structure I, and its forming temperature is 7.5 ℃ （280.65 K）. According to the phase equilibrium between water and methane hydrate in CH4-H2O system, the calculated pressure of methane hydrate forming is 5.6 MPa. In situ Raman spectroscopy is an effective method not only to identify methane hydrate, but also to determine the forming conditions of methane hydrates in fluid inclusions.