天然气水合物粉晶X射线衍射测试参数优化及分析方法

发布时间：2018-04-18 23:17

  本文选题：天然气水合物 + 粉晶X射线衍射　； 参考：《岩矿测试》2017年05期

【摘要】：天然气水合物是由烃类气体和水在低温高压下形成的一种非化学计量的笼型晶体水合物,在常温常压下极易分解,需要在低温条件下对其进行测试。本文针对天然气水合物这一特殊样品,重点研究其粉晶X射线衍射测试条件,系统地探讨了步长、扫描速度、累加次数及测试温度等因素对测试结果的影响,优化了仪器参数,建立了粉晶X射线衍射测试天然气水合物晶体结构的方法,并应用到实验合成的甲烷水合物和我国南海珠江口盆地钻获的天然气水合物样品的晶体结构测试中。结果表明,我国南海珠江口盆地的天然气水合物样品与实验合成的甲烷水合物结构相同,均属立方晶系,为典型的Ⅰ型水合物,晶胞参数分别为11.9309×10~(-10)m和11.9135×10~(-10)m。该技术可准确获得天然气水合物的结构信息,为我国天然气水合物的深入研究提供技术支撑。
[Abstract]:Natural gas hydrate is a kind of non-stoichiometric crystal hydrate formed by hydrocarbon gas and water at low temperature and high pressure. It is easy to decompose at room temperature and pressure and needs to be tested at low temperature.In this paper, the test conditions of powder X-ray diffraction (XRD) of natural gas hydrate are studied. The effects of step size, scanning speed, accumulative times and test temperature on the test results are systematically discussed, and the instrument parameters are optimized.A method for measuring the crystal structure of natural gas hydrate by powder X-ray diffraction has been established and applied to the crystal structure test of methane hydrate synthesized experimentally and natural gas hydrate samples drilled in the Pearl River mouth basin of South China Sea.The results show that the samples of natural gas hydrate in the Pearl River mouth basin in the South China Sea have the same structure as the methane hydrate synthesized experimentally, all of them belong to cubic system and are typical type 鈪，

本文编号：1770527