西非塞内加尔盆地深水区油气地球化学特征与油气成藏

发布时间：2018-05-07 17:38

本文选题：塞内加尔盆地 + 油气地球化学　；参考：《沉积学报》2017年06期

【摘要】：塞内加尔盆地是西非面积最大、勘探程度最低的含盐被动大陆边缘型盆地。2010年之前仅有少量非商业性的油气和重质油发现,近几年在深水区获得油气勘探的重大突破。对深水区油气进行详细地球化学分析及油源对比,结果表明:深水区发育下白垩统阿普特—阿尔布阶和上白垩统赛诺曼—土伦阶两套烃源岩,下白垩统阿普特—阿尔布阶烃源岩的碳同位素组成偏轻,含硫量低,处于成熟—高成熟演化阶段,局部达到过成熟演化阶段;上白垩统赛诺曼—土伦阶烃源岩碳同位素组成偏重,含硫量中等,处于低成熟度—成熟演化阶段。油源对比的结果显示深水区F-1井阿尔布阶储层原油来自阿普特—阿尔布阶烃源岩,F-1土伦阶储层原油来自赛诺曼—土伦阶烃源岩,而S-1井阿尔布阶储层油样性质介于二者之间,为混源的原油。
[Abstract]:Senegal basin is the largest basin in West Africa and has the lowest exploration degree. Before 2010, only a small amount of non-commercial oil and gas and heavy oil were discovered. In recent years, a major breakthrough of oil and gas exploration has been made in deep water area. The detailed geochemical analysis and oil source correlation of oil and gas in deep water area are carried out. The results show that there are two sets of source rocks in the Lower Cretaceous Aput-Albou stage and the Upper Cretaceous Seynorman-Toulon stage in the deep water area. The lower Cretaceous Aput-Albous source rocks have low carbon isotopic composition and low sulfur content, which are in the mature-high mature evolution stage, and the partial over-mature evolution stage. The upper Cretaceous Seynorman-Toulon source rocks have a heavy carbon isotopic composition and a moderate sulfur content, and are in the stage of low maturity and mature evolution. The results of oil source correlation show that the oil of Albuth stage reservoir of well F-1 in deep water area comes from Aputt-Albub stage source rock, and the crude oil of Tulun stage reservoir of F-1 reservoir comes from Xenoman-Tulun stage source rock, while the oil sample property of Albuth stage reservoir of well S-1 is somewhere between the two. Crude oil from mixed sources.
【作者单位】：中海油研究总院;
【基金】：中海油研究总院“油气地球化学技术应用与发展子项(2016)”(2016T-KT14)~~
【分类号】：P618.13

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