石油学报 ›› 2005, Vol. 26 ›› Issue (2): 11-14,20.DOI: 10.7623/syxb200502003

• 地质勘探 • 上一篇    下一篇

库车山前逆冲带超压流体主排放通道对油气成藏的控制

邹华耀1, 郝芳1, 张伯桥2, 陈斌1   

  1. 1. 中国石油大学资源与信息学院, 北京, 102249;
    2. 中国地质大学石油系, 湖北武汉, 430074
  • 收稿日期:2004-02-09 修回日期:2004-06-11 出版日期:2005-03-25 发布日期:2010-05-21
  • 作者简介:邹华耀,男,1963年12月生,2002年获中国地质大学(武汉)博士学位,现为中国石油大学(北京)副教授,主要从事油气成藏研究.E-mail:huayaozou@bjpeu.edu.cn
  • 基金资助:
    国家重点基础发展规划(973)项目(No.2001CB209103);石油科技中青年创新基金项目(No.04E70201)联合资助.

Control of main expelling pathway for overpressure fluid on gas migration and accumulation in Kelasu Thrust Belt of Kuche Depression

ZOU Hua-yao1, HAO Fang1, ZHANG Bo-qiao2, CHEN Bin1   

  1. 1. Faculty of Resources and Information Technology, China University of Petroleum, Beijing 102249, China;
    2. Department of Petroleum, China University of Geosciences, Wuhan 430074, China
  • Received:2004-02-09 Revised:2004-06-11 Online:2005-03-25 Published:2010-05-21

摘要: 前陆逆冲带通常具有异常高压、构造圈闭发育和成藏条件复杂的特点,是油气勘探的高风险地区。对库车坳陷克拉苏逆冲带钻井、地质、地球化学资料的研究证实,克拉2特大型气藏形成于超压流体主排放通道上。该区构造挤压强烈,逆冲断裂活动伴随着下第三系膏泥岩/盐岩塑性流动,那些与膏泥岩/盐岩封闭层变薄、形成局部薄弱带相关的断层成为超压流体排放的主要通道。超压流体主排放通道是该区天然气垂向运移的主要途径,使得下部烃源岩层系中的天然气不断地向上部白垩系它源储层运移。超压流体排放有助于形成溶蚀孔隙,改善储层物性。综合研究表明,超压流体主排放通道对该区天然气成藏具有控制作用。

关键词: 超压流体, 主排放通道, 油气成藏, 前陆逆冲带, 库车坳陷

Abstract: Huge natural gas resources have been proved in the Kelasu Thrust Belt of Kuche Depression.In spite of many structural traps developed,this belt had encountered high risk of hydrocarbon exploration for tens of years.The investigation of geology,drilling and geochemistry shows that a huge gas reservoir was formed in the main expelling pathway for overpressure fluid system under the seal of Eogene gypcrete/salt due to compression stress.The overpressure fluid expulsion occurred preferentially along those thrust faults which cut across the sealed gypcrete/salt bed of the least thickness in the vicinity of belt.The overpressure fluid expelling leads to pressure reduced and then causes gas up-migration along the faults down through underlying Triassic-Jurassic source rocks.In general,the main expelling pathway of overpressure fluid controls gas accumulation in this area.

Key words: overpressure fluid, main fluid-expelling pathway, hydrocarbon accumulation, foreland thrust belt, Kuche Depression

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