岩矿测试2011，Vol.30Issue(4)：416-422,7.
显微激光拉曼光谱测定天然气水合物的方法研究
Study on Determination Method of Natural Gas Hydrates by Micro-Laser Raman Spectroscopy
摘要
Abstract
Natural gas hydrates are non-stoichiometric clathrate compounds that are formed by hydrocarbon gases and water molecules under the conditions of low temperature and high pressure. Micro-laser Raman Spectroscopy is applied as an important method to measure structural parameters ( e. G. Hydration number, cage occupancy). Since the gas hydrate sample readily decomposes, it cannot be measured under normal temperature and pressure. In this paper, we describe a small instrument that has been designed to use Micro-laser Raman spectroscopy at low temperature and pressure for gas hydrates. Our work focuses on the synthesis, preservation and pre-treatment methods of hydrate samples and optimizing parameters of the instrument. The method was verified by repeatedly measuring hydration numbers of the same sample with RSD less than 1 %. The results show that the method is accurate and reliable and can be used to identify the structure of simple hydrates. This method has been applied to measure natural gas hydrate samples recovered from the Shenhu area of the South China Sea and also Qilian mountain permafrost with satisfying results.关键词
天然气水合物/激光拉曼光谱/水合指数/笼占有率Key words
methane hydrates/ laser raman spectroscopy/ hydration number/ cage occupancy引用本文复制引用
夏宁,刘昌岭,业渝光,孟庆国,林学辉,贺行良..显微激光拉曼光谱测定天然气水合物的方法研究[J].岩矿测试,2011,30(4):416-422,7.基金项目
国家自然科学基金项目(41072037) （41072037）
国土资源部公益性行业科研专项经费项目(200911043-21) （200911043-21）
