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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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柴达木盆地尕斯库勒油田原油饱和烃地球化学特征及成因研究
Keywords: 柴达木盆地,尕斯库勒油田,原油,饱和烃,地球化学特征
Abstract:
？尕斯库勒油田是柴达木盆地最大的油田，通过gc\|ms分析技术，系统剖析了尕斯库勒油田原油的地球化学特征。研究结果表明：正构烷烃呈偶奇优势,其中浅部油藏中有部分原油正构烷烃缺乏，遭受到轻度的生物降解。对于正常原油，均具有较低的姥植比，同时具有含量丰富的伽马蜡烷和c35升藿烷，揭示了原油形成于强还原咸水环境，对比深部e13油藏和浅部n1—n12油藏，浅部油藏的成油环境的古盐度略低于深部油藏；原油中c21-/c22+值在1.02~1.71之间，且具有高含量的c27甾烷，指示了其母质来源以菌藻类低等水生生物为主；原油中c29αββ/（αββ+ααα）值以及ts/tm值都较低，都表现出了低熟油的特征，同时c2920s/（20s+20r）值普遍偏低，在深部e13油藏该值分布在0.31~0.40之间，而在浅部n1—n12油藏该值相对较低，分布在0.29~0.36之间，深部油藏的成熟度略高于浅部油藏。
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