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水合物形成于相对低温高压环境,这种条件下对水合物形成后的流体中残留的甲烷浓度进行直接的原位观测非常困难。本文在高压透明腔体中成功合成了甲烷水合物,利用拉曼光谱技术在低温高压条件下对水合物形成过程中流体中残留的甲烷浓度的变化进行了原位观测,用拉曼峰面积比值法获得了三个温度、压力下水合物形成后的饱和甲烷浓度值。研究发现,水合物生长过程中,流体中的甲烷被不断消耗而浓度逐渐降低,温度对水合物形成后的流体中残留的饱和甲烷浓度影响很大,温度越低,残留的饱和甲烷浓度越小,与通常条件下甲烷在水中的溶解度随温度的降低而增加的趋势正好相反。
Hydrate formation in a relatively low temperature and high pressure environment, under the conditions of hydrate formation in the fluid residual methane concentration in situ direct observation is very difficult. In this paper, methane hydrate was successfully synthesized in a high pressure transparent chamber. The changes of residual methane concentration in the fluid during the formation of hydrate were investigated by Raman spectroscopy at low temperature and high pressure. The Raman peak area ratio The results obtained after three hydrate formation temperature and pressure of saturated methane concentration value. The results show that during the hydrate growth, the methane in the fluid is continuously consumed and the concentration gradually decreases. The temperature greatly affects the remaining saturated methane concentration in the fluid after the hydrate is formed. The lower the temperature, the smaller the residual saturated methane concentration , The opposite is true when the solubility of methane in water increases with decreasing temperature under normal conditions.