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首页> 外文期刊>AAPG Bulletin >Organic-geochemistry characterization of the Paleogene to Neogene source rocks in the Sayhut subbasin, Gulf of Aden Basin, with emphasis on organic-matter input and petroleum-generation potential
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Organic-geochemistry characterization of the Paleogene to Neogene source rocks in the Sayhut subbasin, Gulf of Aden Basin, with emphasis on organic-matter input and petroleum-generation potential

机译：亚丁湾Sayhut盆地的古近纪至新近纪烃源岩的有机地球化学特征，重点是有机质输入和生油潜力

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摘要

Paleogene Umm Er Radhuma and Ghaydah and Neogene Sarar source rocks from Sayhut subbasin in the Gulf of Aden Basin were studied to provide information such as organic-matter types, paleoenvironmental conditions, and petroleum-generation potential. This study is based on whole-rock organic-geochemical analyses and organic petrology. The total organic carbon (TOC) contents of the Paleogene to Neogene source rocks range from 0.43% to 6.11%, with an average TOC value of 1.00%, indicating fair to very good source-rock potential. The Paleogene Ghaydah and Umm Er Radhuma source rocks are relatively higher in genetic petroleum potential than Neogene Sarar source rocks. Mainly oil and gas are anticipated from the Ghaydah and Umm Er Radhuma source rocks with hydrogen index (HI) values ranging from 95 to 715 mg hydrocarbon (HC)/g TOC. This is supported by the presence of significant amounts of liptinite macerals in the Ghaydah and Umm Er Radhuma source rocks. The Sarar source rocks are dominated by vitrinitic type III kerogen (HI < 200 mg HC/g TOC) and are thus considered to be gas source rocks. The Paleogene to Neogene source rocks have vitrinite reflectance (R-o) values in the range between 0.30% and 0.77% R-o, and pyrolysis maximum temperature values range from 412 degrees C to 444 degrees C (774 degrees F to 831 degrees F), consistent with the immature to early mature oil window. Therefore, the present-day kerogen type in the Paleogene to Neogene source rocks is original and should not have been altered by thermal maturity.
机译：研究了亚丁盆地海湾Sayhut盆地的古近系Umm Er Radhuma，Ghaydah和Neogene Sarar烃源岩，以提供诸如有机物类型，古环境条件和生油潜力等信息。这项研究基于全岩石有机地球化学分析和有机岩石学。古近纪至新近纪烃源岩的总有机碳（TOC）含量范围为0.43％至6.11％，平均TOC值为1.00％，表明烃源岩潜力尚可达到很好。古近纪Ghaydah和Umm Er Radhuma烃源岩的成岩潜力比新近纪萨拉尔烃源岩高。主要从Ghaydah和Umm Er Radhuma烃源岩中预测到石油和天然气，其氢指数（HI）值范围为95至715 mg烃（HC）/ g TOC。 Ghaydah和Umm Er Radhuma烃源岩中存在大量的锂族辉石岩，这证明了这一点。萨拉尔烃源岩以玻璃质III型干酪根（HI <200 mg HC / g TOC）为主，因此被认为是天然气烃源岩。古近纪至新近纪烃源岩的镜质体反射率（Ro）值在0.30％至0.77％Ro之间，热解最高温度值在412摄氏度至444摄氏度（774华氏度至831华氏度）的范围内未成熟到早期成熟的油窗。因此，现今古近纪至新近纪烃源岩的干酪根类型是原始的，不应因热成熟而改变。

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