天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地西南地区油气富集与储层演化史

李威1,2,文志刚1,窦立荣1,3,谢勰4,王泽5,李馨4   

  1. 1.长江大学资源与环境学院,长江大学油气资源与勘探技术教育部重点实验室,湖北 武汉 430100;
    2.中国石油勘探开发研究院,北京 100083;3.中国石油天然气勘探开发公司,北京 100034;
    4.长庆油田采油十一厂,甘肃 庆阳 745100;
    5.川庆钻探长庆井下技术作业公司,陕西 西安710000
  • 收稿日期:2017-02-17 修回日期:2017-05-02 出版日期:2017-06-10 发布日期:2017-06-10
  • 通讯作者: 文志刚(1965-),男,河南武陟人,教授,博士,博士生导师,主要从事有机地球化学及石油地质学的教学与研究. E-mail:wzg728@sina.com.
  • 作者简介:李威(1988-),男,湖北仙桃人,博士研究生,主要从事油气藏形成与分布研究. E-mail:liwei123456@petrochina.com.cn.
  • 基金资助:

    中国石油天然气股份有限公司科技创新项目(编号:2008D-5006-01-10)资助.

Coupling relationship between tight oil and gas accumulationand compacting history in southwestern Ordos Basin,China

Li Wei1,2,Wen Zhi-gang1,Dou Li-rong1,3,Xie Xie4,Wang Ze5,Li Xin4   

  1. 1.College of Resources and Environment;Key Laboratory of Exploration Technology forOil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China;
    2.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    3.China National Oil and Gas Exploration and Development Corporation,Beijing 100034,China;
    4.Oil Recovery Plant No.11,PetroChina Changqing Oilfield Company,Qingyang 745100,China;
    5.China Petroleum Chuanqing Drilling Changqing Downhole Technology Operating Company,Xi'an 710000,China
  • Received:2017-02-17 Revised:2017-05-02 Online:2017-06-10 Published:2017-06-10

摘要:

针对鄂尔多斯盆地西南地区三叠系延长组致密油富集成藏特征与储层致密演化之间的关系,充分分析包裹体宿主矿物成岩序列和均一温度,认为石英加大边中包裹体形成于早白垩世中晚期生排烃高峰期,含铁碳酸盐中包裹体为早白垩世晚期充注产物。基于该认识,结合现今储层孔隙发育特征、毛管压力特征,探讨成藏期储层古物性、孔喉毛细管力、地层过剩压力等分布特征,分析各成藏期物性、孔喉压力与油藏关系,结果表明:烃类主要充注在孔渗相对优良的储层中,但2次充注期物性控制因素略有差异,早白垩世中_晚期储层尚未致密,早白垩世晚期含铁碳酸盐胶结物发育,储层致密,物性变差,含铁碳酸盐是储层致密主因;分析异常压力特征,认为长7油层组优质烃源岩欠压实作用和生烃增压共同产生异常高压,为低渗透储层油气大规模运移的主要动力。

关键词: 烃类包裹体, 致密油, 致密油藏, 延长组, 鄂尔多斯盆地

Abstract:

In this paper,we investigate the coupling relationship between tight oil and gas accumulation and densification in the Upper Triassic Yanchang Formation in the southwestern part of Ordos Basin.Based on the analyses of diagenetic sequences and inclusion homogenization temperature,hydrocarbon inclusions in quartz over growth were trapped in the peak of hydrocarbon generation and expulsion in the middle and late periods of Early Cretaceous,while those in ferruginous carbonates were formed by hydrocarbon charging in the late period of Early Cretaceous.Original reservoir porosity,permeability,the capillary force and the excee pressure and their relationship with reservoirs in hydrocarbon accumulation periods were studied based on the present pore characteristics and the capillary force of reservoirs.The results show that hydrocarbon mainly accumulate in reservoirs with good porosity and permeability.However,there are differences in controlling factors of porosity and permeability in two accumulation periods.It is proposed that the super low permeability reservoirs had not been developed in the middle and late periods of Early Cretaceous,the ironed carbonate cement in the reservoir compacted eventually with poor property of reservoirs in the late period of Early Cretaceous.The characteristics of abnormal pressure showed that the abnormal high pressure,which was generated by under-compaction and increasing pressure during maturation of excellent source rocks in Chang 7 sub-layer,was the principal force of large-scale hydrocarbon migration in low permeability reservoir.

Key words: Hydrocarbon inclusions, Tight oil, Tight oil lithologicreservoir, Yanchang Formation, Ordos Basin

中图分类号: 

  • TE122.1

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