叶城凹陷柯东1井凝析油及柯克亚原油的油源分析
Oil source of condensates from Well Kedong 1 and crude oil from Kekeya in Yecheng depression
查看参考文献12篇
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文摘
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塔里木盆地叶城凹陷拥有多套烃源岩层, 主要为石炭系卡拉乌依组、二叠系棋盘组与普司格组2-3段、侏罗系煤系地层与叶尔羌群等, 这些烃源岩都可能是柯东1井凝析油和柯克亚第三系原油的母源。在这一地区, 油源一直是一个很具争议性的问题。选取了叶城凹陷克里阳构造带柯东1井2个凝析油、柯克亚构造带7个第三系原油, 以及叶城凹陷各烃源岩层具有代表性的17个烃源岩样品, 对其生物标志物及正构烷烃单体烃稳定碳同位素比值等参数进行了详细的测试分析。油油对比揭示, 柯东1井原油与柯克亚第三系原油在正构烷烃组分、成熟度与稳定碳同位素组成等特征上具有明显的相似性, 显示同源的特征。油源对比显示, 普司格组2-3段下部是这些原油的源岩。这一烃源岩层具有与柯克亚地区原油一致的成熟度和相似的特征性生物标志物, 即高含量的重排藿烷、Ts 和C_(27)–C_(29)重排甾烷等, 而其他烃源岩层则不具备这类特征。较高成熟阶段形成的原油, 解释了普司格组2-3段烃源岩可溶有机质与柯东1井等原油在单体烃稳定碳同位素比值上具有2‰~3‰的差别。 |
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其他语种文摘
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Yecheng depression in Tarim Basin developed several layers of source rocks, including Carboniferous Kalawuyi formation, Permian Qipan formation and Pusige formation 2-3 parts, Jurassic Yarkant formation and coal measure strata. These source rocks may be the origin of condensates from Well Kedong 1 and crude oil from Kekeya Tertiary strata. The origin of crude oil in this area has been controversial for a long time. We selected 2 condensate samples from Well Kedong 1,7 Tertiary crude oil samples from Keliyang tectonic belt of Yecheng depression, 17 representative source rock samples, and finished a series of measuring-analysis work on geochemistry parameters of these samples, such as biomarkers and individual hydrocarbon isotopic composition ratio. Oil-oil correlation shows that condensates from Well Kedong 1 and Kekeya Tertiary strata have much in common in n-alkanes component, maturity and stable carbon isotope, indicating their same-origin characteristics. Oil-source correlation shows that source rocks from underpart of 2-3 sections of Pusige formation may be origin of crude oil in the research area. Pusige formation source rock strata and crude oil from Kekeya area have the same maturity and similar characteristic biomarkers, that is high content of C30 rearrangement hopane, Ts, C_(27)–C_(29) diasteranes, etc, while other source rocks strata don’t have this feature. The crude oil’s high maturity may explain why there is a 2‰–3‰ difference in stable carbon isotope ratio between condensates from Well Kedong 1 and soluble organic matters from Pusige formation 2-3 section’s underpart source rocks. |
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来源
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地球化学
,2014,43(5):469-476 【核心库】
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关键词
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凝析油
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生物标志物
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稳定碳同位素
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油源对比
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塔里木盆地
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地址
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1.
中国科学院广州地球化学研究所, 广东, 广州, 510640
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中国石油塔里木油田分公司勘探开发研究院, 新疆, 库尔勒, 841000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家“十一五”油气重大专项
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国家自然科学基金
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文献收藏号
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CSCD:5268921
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