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OALib Journal期刊
ISSN: 2333-9721
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煤系有机质生成烃类中甾烷系列化合物地球化学特征——以高温封闭体系下热模拟实验为例
Keywords: 甾烷,泥炭,煤岩,成熟度
Abstract:
？选择泥炭和褐煤进行热模拟试验并开展对比研究，目的是全面获得煤系有机质生烃特征。通过对草本泥炭和褐煤的热模拟实验液态产物饱和烃进行色谱—质谱分析得到，在泥炭和褐煤热模拟样品中均检测出丰富的甾族系列化合物，且以c29甾烷占优势。研究发现，随热模拟温度增高，c29甾烷相对含量减少，温度在350℃之后趋于稳定；而c27甾烷和c28甾烷相对含量具有增加的趋势，暗示了c29甾烷的去甲基效应。c2920s/(20s+20r)值和c29ββ/(ββ+αα)值可以判识样品是否成熟或未熟，是良好的成熟度指标。∑重排甾烷/∑规则甾烷值可以区分成样品成熟度。研究发现，在低演化阶段，泥炭和褐煤模拟曲线存在显著差异，而在高演化阶段，二者吻合较好。所以，对比研究泥炭和褐煤的地球化学特征，对认识煤系有机质生烃特征具有重要意义。
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