石油与天然气地质 ›› 2004, Vol. 25 ›› Issue (5): 559-564,591.doi: 10.11743/ogg20040516

• 油气地质 • 上一篇    下一篇

库车前陆盆地迪那2气田成藏机理及成藏年代

孙冬胜1,2, 金之钧1,2, 吕修祥2,3, 周新源2,3, 杨明慧2,3   

  1. 1. 中国石化石油勘探开发研究院,北京 100083;
    2. 石油大学油气成藏机理教育部重点实验室,北京 102249;
    3. 石油大学盆地与油藏研究中心,北京 102249
  • 收稿日期:2004-08-28 出版日期:2004-10-25 发布日期:2012-01-16
  • 基金项目:

    国家"十五"科技攻关项目(2001BA605-02-03-04)

Reservoiring mechanism and finalization period of Dina 2 gasfield in Kuqa basin

Sun Dongsheng1,2, Jin Zhijun1,2, Lu Xiuxiang2,3, Zhou Xinyuan2,3, Yang Minghui2,3   

  1. 1. Exploration & Production Research Institute, SINOPEC, Beijing;
    2. Key Laboratory of Petroleum Accumulation Mechanism of Ministry of Education, University of Petroleum, Beijing;
    3. Research Center of Basin & Reservoir, University of Petroleum, Beijing
  • Received:2004-08-28 Online:2004-10-25 Published:2012-01-16

PDF (PC)

427

被引次数

41

摘要：

库车前陆盆地具有典型的双超压体系。深部超压体系的形成过程与源岩快速大量的生气作用密切有关,同时也决定了中生界源岩生成的天然气主要以水溶气形式存在。上部超压体系具有常压成藏的特点,当深部超压体系中的天然气沿断裂以混相涌流方式进入上部常压环境后,发生脱气析出并聚集成藏,其后,经构造运动进一步的挤压作用形成上部超压体系。迪那2气田是上部超压体系中的天然气成藏。在圈闭发育史及源岩生烃史分析的基础上,结合储层流体包裹体及自生矿物伊利石的K/Ar测年数据,认为迪那2气田发生过3期油气的充注,古近纪末期为液态烃注入,但遭受破坏;库车早中期为气液两相注入;库车晚期及西域早期为天然气注入,第三期是成藏的关键时期。

关键词: 成藏年代, 成藏机理, 双超压体系, 水溶气, 迪那2气田

Abstract:

There are two overpressure systems,lower and upper overpressure systems,in Kuqa foreland basin.The former was closely related with rapid and large gas generation,and thus the gas generated from Mesozoic source rocks mainly took the form of water-soluble gas.The upper overpressure system has the characteristics of reservoiring at normal pressure.When gas in the lower overpressure system migrated upward along faults in the form of miscible fluids into the upper normal pressure environment,degasification would occur and then accumulated in reservoirs.At a later stage,the upper overpressure system was formed under further compression of tectonic movement.Dina 2 gasfield is the final results of gas accumulation in the upper overpressure system.Based on analysis of trap development history and hydrocarbon generation history,in combination with fluid inclusion in the reservoir and K/Ar dating of authigenic illite,it is believed that Dina 2 gasfield had been charged in three different stages.In the first stage,liquid hydrocarbons were charged at the end of Paleogene and destroyed later.In the second stage,mixed liquid and gaseous hydrocarbons were charged in early-middle Kuqa stage.In the third stage,natural gas was charged in late Kuqa and early Xiyu stages,which was the key reservoiring stage of the field.

Key words: reservoiring period, reservoiring mechanism, dual overpressure systems, water-soluble gas, Dina 2 gasfield

中图分类号: