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OALib Journal期刊
ISSN: 2333-9721
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柴达木盆地西南缘乌南油田原油地球化学特征
Keywords: 柴达木盆地,乌南油田,原油,生物标志化合物,单体烃碳同位素
Abstract:
？通过对柴达木盆地西南缘乌南油田原油样品饱和烃、芳烃生物标志化合物和单体烃碳同位素的系统分析,阐明了它们的地球化学特征。研究结果表明,样品中正构烷烃系列碳数分布具有双重性模式,pr/ph<0.5,呈强植烷优势；具有相对较高含量的三环萜烷和伽马蜡烷,藿烷c35/c34值基本上≤1；芳烃组分主要以萘系列、菲系列为主,三芳甾烷系列化合物含量较高,指示了乌南原油形成于半咸水—咸水湖相较强还原沉积环境,母质来源主要为低等水生生物,藿烷和甾烷成熟度参数反映其主要为低熟原油。原油单体烃碳同位素分布曲线模式整体上较为水平,高碳数略有增高的趋势,也表明了原油以水生生物和细菌为主的偏腐泥型有机质生源特征。
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