天然气地球科学

• 天然气地质学 • 上一篇    下一篇

准噶尔盆地南缘下组合油气成藏过程——以齐古油田为例

胡瀚文1,张元元2,卓勤功3,贾承造3,郭召杰2   

  1. 1.中国石油化工股份有限公司石油勘探开发研究院,北京 100083;
    2.造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871;
    3.中国石油勘探开发研究院,北京 100083
  • 收稿日期:2018-11-19 修回日期:2019-03-14 出版日期:2019-04-10
  • 通讯作者: 张元元(1987-),女,山东济宁人,研究员,博士,主要从事构造地质学、盆地与造山带构造、油气盆地分析与资源环境效应研究. E-mail:yy-zhang@pku.edu.cn
  • 作者简介:胡瀚文(1989-),女,山东烟台人,博士后,主要从事含油气系统定量分析和油气成藏演化史研究. E-mail:huhwo8@163.com.
  • 基金资助:
    国家科技重大专项“十三五”项目(编号:2017ZX05008-001;2016ZX05003-002);中国石油科技开发项目(编号:2016B-0502)联合资助.

Hydrocarbon charging history of the lower petroleum system in the southern Junggar Basin: Case study of the Qigu Oil Field

Hu Han-wen1,Zhang Yuan-yuan2,Zhuo Qin-gong3,Jia Cheng-zao3,Guo Zhao-jie2   

  1. 1.Research Institute of Petroleum Exploration and Production,SINOPEC,Beijing 100083,China;2.Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and  Space Science,PekingUniversity,Beijing 100871,China;3.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
  • Received:2018-11-19 Revised:2019-03-14 Online:2019-04-10

摘要: 准噶尔盆地南缘的二叠系—侏罗系含油气系统为该盆地的重要勘探领域,潜力大,但对其油气成藏过程的认识仍存在分歧。通过分析原油性质,并应用流体包裹体观察、测温和盆地模拟以及储层颗粒荧光等多种技术方法,解析南缘山前齐古油田的油气充注过程。结果表明南缘齐古油田原油密度大且含蜡量高,气洗特征显著;不同层位储层中烃类族组分分异的现象明显。早期低成熟度的油气在~100Ma充注于下侏罗统储层,在~45Ma充注于中侏罗统储层,形成自生自储的古油藏。晚新生代(~7Ma)是齐古油田的主要成藏期,在断裂的作用下,古油藏被调整,深部高成熟度的原油和天然气沿断裂运移,二叠系—侏罗系储层发生气洗作用,导致不同层位储层内的油气分布复杂。由于齐古背斜下白垩统区域盖层缺失和断裂沟通地表,导致浅部中侏罗统西山窑组储层油气严重散失,油气藏被破坏;而在中下侏罗统局部盖层的保护下,二叠系—下侏罗统油气藏得以保存。

关键词: 烃类流体特征, 油气成藏, 齐古油田, 准噶尔盆地南缘

Abstract: The Permian-Jurassic petroleum system in the southern Junggar Basin is important and potential.However,divergence still exists in the hydrocarbon accumulation history in this area.Integrated methods,such as organic geochemistry,granular fluorescence technology,fluid inclusion analysis and basin modeling,were used to discuss the hydrocarbon charging history of the lower petroleum system in the Qigu Oil Field.The results show that the crude oil has the characteristics of gas washing like the heavy density and much wax.Hydrocarbon displays differential fluorescent properties in different formations and in the two sides of faults.The low-maturity oil charged the Lower Jurassic reservoirs at ~100Ma before it charged the Middle Jurassic reservoirs at ~45Ma.The high-maturity oil charged the Lower Jurassic-Middle Jurassic Xishanyao Formation reservoirs at ~7Ma.During the tectonic activities in the Late Cenozoic,the paleo oil reservoirs were adjusted and the gas washed the Permian-Jurassic reservoirs.Multiple stages of hydrocarbon charging resulted in the complex distributions of oil and gas.Gas and most oil escaped from shallow Middle Jurassic Xishanyao Formation reservoirs because of the absent Lower Cretaceous regional seal rocks and faults up to the ground.Fortunately,the Permian-Lower Jurassic petroleum reservoirs remained under the protection of the Lower-Middle Jurassic sealing beds.

Key words: Characteristics of hydrocarbon, Hydrocarbon accumulation, Qigu Oil Field, Southern Junggar Basin

中图分类号: 

  • TE122.1+2
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