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现代地质 ›› 2015, Vol. 29 ›› Issue (6): 1425-1434.

• 石油地质学 • 上一篇    下一篇

库车坳陷东部凝析油特征及其成藏意义

李峰1,2,3,姜振学1,2,李卓1,2,肖中尧4,袁文芳4,曹少芳4   

  1. (1. 中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;2. 中国石油大学(北京) 非常规天然气研究院,北京 102249; 3. 中海油研究总院勘探研究院,北京 100027;4. 中国石油塔里木油田公司 勘探开发研究院,新疆 库尔勒 841000)
  • 出版日期:2015-12-24 发布日期:2016-02-29
  • 作者简介:李峰,男,博士研究生,1985年出生,石油地质学专业,主要从事油气藏形成机理与分布规律的研究。 Email:lf151615@163.com。
  • 基金资助:

    国家自然科学基金重点项目(40972088);国家重点基础发展计划项目(2011CB201105);国家科技重大专项(2011ZX05003-001,2011ZX05008-004)。

Characteristics of Condensate Oil and Its Significance for Hydrocarbon Accumulation in the Eastern Kuqa Depression

LI Feng1,2,3, JIANG Zhen-xue1,2, LI Zhuo1,2, XIAO Zhong-yao4, YUAN Wen-fang4, CAO Shao-fang4   

  1. (1. State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum, Beijing 102249, China; 2. Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China; 3. Exploration Research Department, CNOOC Ltd.,Beijing 100027, China; 4. Research Institute of Exploration & Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000,China)
  • Online:2015-12-24 Published:2016-02-29

摘要:

利用原油物性、族组分、轻烃组分、碳同位素、生物标志化合物等实验资料,系统分析了库车坳陷东部凝析油的物性和有机地球化学特征,厘定了凝析油的成因类型 ,并在此基础上明确了油气充注历史。研究结果表明:库车坳陷东部凝析油属于典型的陆相油,具有密度低、粘度低、凝固点低、含硫低和含蜡中等的特征,碳同位素关系以及生物标志化合物特征表明 凝析油主要来自三叠系湖相烃源岩。库车坳陷东部凝析油和天然气具有不同源、不同期的特征,凝析油主要为湖相烃源岩在成熟演化阶段的产物,天然气主要为煤系烃源岩在高—过成熟演化阶段的产物 ,凝析油的成熟度低于天然气的成熟度,且早期原油遭受气洗改造作用。因此,库车坳陷东部总体上具有“早油晚气”的充注特征,现今的凝析油是早期形成的原油被气洗改造而形成的。

关键词: 凝析油, 生物标志化合物, 气洗, 油气成藏, 库车坳陷东部

Abstract:

Based on the the experimental data of physical properties, components, light hydrocarbon components, carbon isotope and biomarker, physical properties and geochemical characteristics of condensate oil in the eastern Kuqa Depression,were systematically analysed. Genetical type of condensate oil and hydrocarbon charging history were confirmed. The results show that condensate oil in the eastern Kuqa Depression is typical continental oil, which is featured by low density, low viscosity, low freezing point, low sulfur content and medium wax content. Relationship between carbon isotope and biomarker indicates that condensate oil is mainly derived from Triassic lacustrine source rocks. Condensate oil and natural gas in the eastern Kuqa Depression have different origins. The condensate oil is mainly derived from the mature lacustrine source rocks, and natural gas is originated from mature to post-mature coal-measure source rocks. The maturity of condensate oil is lower than that of natural gas, and early oil suffered from gas washing. Therefore, the eastern Kuqa Depression has the charging feature of ‘early-stage accumulation of oil and late-stage accumulation of gas’. Todays condensate oil is early accumulating oil which undergone gas washing.

Key words: condensate oil, biomarker, gas washing, hydrocarbon accumulation, the eastern Kuqa Depression

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