本文選題：天然氣水合物 + 粉晶X射線衍射　； 參考：《巖礦測試》2017年05期

【摘要】：天然氣水合物是由烴類氣體和水在低溫高壓下形成的一種非化學(xué)計量的籠型晶體水合物,在常溫常壓下極易分解,需要在低溫條件下對其進行測試。本文針對天然氣水合物這一特殊樣品,重點研究其粉晶X射線衍射測試條件,系統(tǒng)地探討了步長、掃描速度、累加次數(shù)及測試溫度等因素對測試結(jié)果的影響,優(yōu)化了儀器參數(shù),建立了粉晶X射線衍射測試天然氣水合物晶體結(jié)構(gòu)的方法,并應(yīng)用到實驗合成的甲烷水合物和我國南海珠江口盆地鉆獲的天然氣水合物樣品的晶體結(jié)構(gòu)測試中。結(jié)果表明,我國南海珠江口盆地的天然氣水合物樣品與實驗合成的甲烷水合物結(jié)構(gòu)相同,均屬立方晶系,為典型的Ⅰ型水合物,晶胞參數(shù)分別為11.9309×10~(-10)m和11.9135×10~(-10)m。該技術(shù)可準(zhǔn)確獲得天然氣水合物的結(jié)構(gòu)信息,為我國天然氣水合物的深入研究提供技術(shù)支撐。
[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，

本文編號：1770527