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等容条件下H2O-CO2-CH4混合流体的高温拉曼光谱就位分析

DOI: 10.11858/gywlxb.2003.01.002, PP. 8-15

Keywords: 合成包裹体,等容,流体结构,高温,拉曼光谱,氢键

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Abstract:

以合成包裹体作为腔体,用显微激光拉曼探针就位分析了H2O-CO2-CH4混合流体的高温特性。研究结果表明,在高温下,CH4和CO2相互之间对各自拉曼光谱的影响不大,水分子对它们的拉曼峰有比较大的影响。在等容条件下,流体均一前,随着温度的升高,水分子的氢键几乎呈线性减少,均一为气相的流体,水分子伸缩振动拉曼峰的变化与一般气体变化相似;随着温度升高,体系压力的增加,最大峰频率呈很微小的降低趋势。均一为液相的流体中的水分子,在均一温度时,氢键变化发生了转折,均一后流体中水分子的氢键受温度的影响比均一前明显要小,在测量的最高温度520℃,水分子存在着一定的氢键作用。一直到拉曼光谱测量的最高温度580℃还未均一的流体,液相中水分子存在比较强的氢键作用。

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