石油与天然气地质 ›› 2016, Vol. 37 ›› Issue (6): 935-943.doi: 10.11743/ogg20160615

• 油气地质 • 上一篇    下一篇

库车坳陷克拉2气田油气充注和超压对储层孔隙的影响

郭小文1, 刘可禹2, 宋岩2, 赵孟军2, 柳少波2, 卓勤功2, 鲁雪松2   

  1. 1. 中国地质大学 构造与油气资源教育部重点实验室, 湖北 武汉 430074;
    2. 中国石油 勘探开发研究院, 北京 100083
  • 收稿日期:2015-07-16 修回日期:2016-11-02 出版日期:2016-12-08 发布日期:2017-01-02
  • 作者简介:郭小文(1980-),男,副教授,石油及天然气地质。E-mail:cuggxw@163.com。
  • 基金资助:
    国家油气重大专项(2011ZX05003-001);国家自然科学基金项目(41302110,41572114)。

Influences of hydrocarbon charging and overpressure on reservoir porosity in Kela-2 gas field of the Kuqa Depression,Tarim Basin

Guo Xiaowen1, Liu Keyu2, Song Yan2, Zhao Mengjun2, Liu Shaobo2, Zhuo Qinggong2, Lu Xuesong2   

  1. 1. Key Laboratory of Ministry of Education Tectonics and Petroleum Resources, China University of Geosciences, Wuhan, Hubei 430074, China;
    2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2015-07-16 Revised:2016-11-02 Online:2016-12-08 Published:2017-01-02

摘要: 为了研究库车坳陷克拉2气田砂岩储层孔隙物性影响因素,在对克拉2气田砂岩储层特征和超压成因研究基础之上,采用颗粒定量荧光和流体包裹体技术确定古油水界面和油气充注史,并分析油气充注和超压与储层孔隙之间的关系。研究结果表明,库车坳陷克拉2气田泥岩和砂岩中超压形成与水平构造挤压作用具有重要关系。克拉2气田盐下砂岩储层经历最大古埋藏深度达6 000 m以上却显示出异常高的原生孔隙度是因为原油充注到储层中在比较好的盐岩盖层封闭条件下,砂岩储层孔隙中的油没有被排出使砂岩储层胶结作用减弱或者形成欠压实。其主要证据有:①高的定量荧光参数QGF指数和QGF-E强度对应的砂岩储层孔隙度和渗透率也比较高,而在古油水界面之下,砂岩孔隙度和渗透率都很低;②库车坳陷克拉2气田晚期油充注发生库车组沉积早期,对应砂岩储层的埋藏深度比较小,孔隙度比较高。研究表明深层砂岩储层油充注和超压发育对储层孔隙具有重要影响。

关键词: 油气充注, 古油-水界面, 储层孔隙, 克拉2气田, 塔里木盆地

Abstract: In order to investigate the factors controlling reservoir porosity in the Kela-2 gas field of the Kuqa Depression,Tarim Basin,the sandstone reservoir characteristics,the origin of overpressure,as well as the evolution of the reservoir charging history were studied by using quantitative grain fluorescence and fluid inclusion data.The research results indicate that horizontal tectonic compression played an important role in the overpressure generation in the Kela-2 gas field.The overpressured presalt sandstone reservoirs with the maximum paleoburial depth over 6 000 m have anomalously high primary porosities.The reason is that the cementation of the sandstone was influenced and even undercompaction occurred as the oil charged into the sandstone reservoirs was not expelled under the efective sealing of salt and gypsum cap rocks in the Kela-2 gas field.This is evidenced by that sandstone reservoirs with high intensities of Quantitative Grain Fluorescence (QGF) and QGF on extract (QGF-E) are associated with high porosity and permeability intervals,and sandstone units below the ancient oil-water contact have low porosity and permeability.Late oil charging occurred at the early period of the Kuqa Formation deposition and the corresponding sandstone reservoirs in the Kela-2 gas field had shallower burial depth and high primary porosities.This research suggests that the oil charging and overpressure played important roles in the development of reservoirs porosity.

Key words: hydrocarbon charging, ancient oil-water contact, reservoir porosity, Kela-2 gas field, Tarim Basin

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