鄂尔多斯盆地延长组烃源岩中单甲基烷烃来源及意义
发布时间：2018-10-31 10:49
【摘要】：单甲基烷烃是湖相烃源岩饱和烃中常见的支链烷烃,其母质来源的研究一直存在争议。对鄂尔多斯盆地上三叠统延长组烃源岩样品进行了TOC测定、岩石热解、饱和烃GC-MS和单体碳同位素等分析,并在饱和烃中检出了丰富的单甲基烷烃化合物。地化分析表明,该区长7-长10烃源岩的有机质类型为Ⅱ-Ⅲ型,C_(29)≥C_(27)规则甾烷,高等植物的贡献略微大于低等水生藻类或细菌;单甲基烷烃碳数分布为C_(12)-C_(32),甲基取代位置以C_2和C_3为主。饱和烃单体碳同位素组成数据显示,姥鲛烷和植烷的δ~(13)C比同碳数正构烷烃重1‰~2‰;同碳数2-和3-甲基烷烃具有相近的碳同位素组成,表明两类化合物具有相同物源;单甲基烷烃比正构烷烃更富集~(13)C,表现出更大的δ~(13)C值。结合古环境等信息表明,鄂尔多斯盆地检出的单甲基烷烃可能来自于浮游植物或者异养细菌,单甲基烷烃可以作为一种指示生油母质的生物标志化合物。
[Abstract]:Monomethyl alkanes are common branched alkanes in saturated lacustrine source rocks. The source rock samples of the Upper Triassic Yanchang formation in Ordos Basin were determined by TOC, pyrolysis of rocks, GC-MS of saturated hydrocarbons and single carbon isotopes, and abundant monomethyl alkanes were detected in saturated hydrocarbons. Geochemical analysis shows that the organic matter type of Chang7-Chang10 source rock is type 鈪，
本文编号：2301898
[Abstract]:Monomethyl alkanes are common branched alkanes in saturated lacustrine source rocks. The source rock samples of the Upper Triassic Yanchang formation in Ordos Basin were determined by TOC, pyrolysis of rocks, GC-MS of saturated hydrocarbons and single carbon isotopes, and abundant monomethyl alkanes were detected in saturated hydrocarbons. Geochemical analysis shows that the organic matter type of Chang7-Chang10 source rock is type 鈪，
本文编号：2301898
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