地学前缘 ›› 2012, Vol. 19 ›› Issue (2): 176-183.

• 论文 • 上一篇    下一篇

合水地区长6油层微观渗流特征及驱油效率影响因素研究

 张章, 朱玉双, 陈朝兵, 牛小兵, 辛红刚, 朱静, 全洪慧   

  1. 1. 大陆动力学国家重点实验室， 陕西 西安 710069 2. 西北大学 地质学系， 陕西 西安 710069 3. 中海石油（中国）有限公司 天津分公司， 天津 300452 4. 中国石油 长庆油田公司， 陕西 西安 710069
  • 收稿日期:2011-03-14 修回日期:2012-02-15 出版日期:2012-03-25 发布日期:2012-03-25
  • 作者简介:张章（1985—），男，硕士研究生，矿物学、岩石学、矿床学专业，主要从事微观渗流、储层地质、油藏工程方面的研究。E-mail：zh.1002@qq.com
  • 基金资助:

    国家科技重大专项（2008ZX05013005）；西北大学研究生科研实验资助项目（10DZSY030）

Microflow characteristics and influencing factors of oil displacement efficiency of Chang6 reservoir in Heshui area.

 ZHANG  Zhang, SHU  Yu-Shuang, CHEN  Chao-Bing, NIU  Xiao-Bing, XIN  Gong-Gang, SHU  Jing, QUAN  Hong-Hui   

  1. 1. State Key Laboratory of Continental Dynamics, Xian 710069, China 2. Department of Geology, Northwest University, Xian 710069, China 3. Tianjin Company, China National Offshore Oil Corporation, Tianjin 300452, China 4. Changqing Oil Field Company, PetroChina, Xian 710069, China
  • Received:2011-03-14 Revised:2012-02-15 Online:2012-03-25 Published:2012-03-25

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摘要：

对鄂尔多斯盆地合水地区长6油层组超低渗透储层的微观渗流特征及驱油效率影响因素进行深入研究，为提高采收率提供了科学依据。研究以真实砂岩微观模型渗流实验为主要手段，结合铸体薄片、扫描电镜、压汞等方法对孔隙结构、岩石类型等进行测试。研究表明，研究区长6油层的渗流特征以网状驱替和均匀驱替为主，指状驱替甚少；不同的驱替类型对应不同的最终驱油效率，均匀驱替模型最终驱油效率最高，指状驱替模型最低。储层物性中渗透率是影响驱油效率的主要因素，孔隙度次之；适当地提高驱替压力能够有效地提高驱油效率；提高注水体积倍数也能适当地提高驱油效率；非均质性对驱油效率也有一定的影响。

关键词: 合水, 超低渗, 渗流特征, 驱油效率, 储层物性, 驱替压力, 非均质性, 鄂尔多斯盆地

Abstract:

 The present paper is aim at a deeper study  on  the microseepage flow and the influencing factors of displacement efficiency  of Chang6 reservoir of Triassic Yanchang Formation in the area of Heshui, in the Ordos Basin in order to  provide a scientific basis for increasing the recovery ratio. Take the real sandstone micromodel experiment as the main method in this study, and  combined with  the checkup of slices, SEM, mercury penetration etc.  to study the pore structure, the composition of the rocks. The results show that the waterdrive patterns in the reservoirs of Chang6 in this area are mainly homogeneous seepage and reticular seepage, the finger like seepage is few. The homogeneous seepage gets the highest final oil saturation and final displacement efficiency, the models of reticular seepage are lower, the models of the finger like seepage are the lowest. As to the physical properties, the permeability is the first factor affecting the displacement efficiency, the porosity is the second; the displacement efficiency can be increased effectively by increasing the drive pressure advisably; the displacement efficiency also can be increased by increasing the multiple volume of driving water, finally the  heterogeneity also is one of the affecting factors.

 

Key words:  Heshui, ultralow permeability, microflow characteristics, oil displacement efficiency, physical property of reservoir, drive pressure, heterogeneity, Ordos Basin

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