天然气地球科学 ›› 2010, Vol. 21 ›› Issue (2): 270–275.doi: 10.11764/j.issn.1672-1926.2010.02.270

• 天然气地质学 • 上一篇    下一篇

三肇凹陷扶余油层中—低渗透储层微观孔隙结构特征及其分类

刘媛, 朱筱敏, 张思梦, 赵东娜   

  1. 中国石油大学(北京),北京 102249
  • 收稿日期:2009-06-01 修回日期:2009-08-21 出版日期:2010-04-10 发布日期:2010-04-10
  • 通讯作者: 刘媛circle56799@163.com. E-mail:circle56799@163.com.
  • 作者简介:刘媛(1982-),女,博士研究生,主要从事层序地质学和测井地质学研究.

Microcosmic Pore Structure in Low Moderate Permeability Reservoir  of Fuyu Oil Layer in Sanzhao Sag

 LIU  Yuan, ZHU  Xiao-Min, ZHANG  Si-Meng, ZHAO  Dong-Na   

  1. China University of Petroleum, Beijing 102249,China
  • Received:2009-06-01 Revised:2009-08-21 Online:2010-04-10 Published:2010-04-10

摘要:

采用铸体薄片、共聚焦扫描电镜成像技术、常规压汞分析和恒速压汞分析等多种手段,对三肇凹陷扶余油层中—低渗透储层孔隙结构特征进行综合研究。结果表明,储层孔隙结构异常复杂,粒内溶孔、粒间溶孔等次生溶蚀孔隙构成了其主要储集空间,孔径大小在22.49~49.31 mm之间,孔喉连通性差异较大。在此基础上,以渗透率为主线,结合孔隙类型、孔喉半径、孔喉半径比以及孔喉连通性等参数,将研究区储层主要划分为中渗透储层和低渗透储层2种基本类型,前者以中渗透中孔细喉道型为主,后者又进一步细分为低渗透中孔细喉道型、低渗透小孔不均匀微细喉道型和低渗透小孔较均匀微细喉道型等3个亚类。明确储层微观孔隙结构特征及其分类,有利于进一步开展储层评价,对油田后期挖潜具有重要的指导意义。

关键词: 三肇凹陷, 扶余油层, 中—低渗透储层, 孔隙结构, 分类评价

Abstract:

By cast slices, co-focused SEM, traditional mercury-injection method, and constant rate mercury\|injection method, the microcosmic pore structure in low\|moderate permeability reservoir of Fuyu oil layer in Sanzhao sag was determined. The pore structure is very complex. The secondary dissolution pore(i.e. intragranular pore, intergranular pore) is the main type of reservoir, with average diameter of 22.49-49.31 mm and various connectivity between pore and throat. According to permeability, associating with pore type, pore throat radium, ratio of pore throat radium, and connectivity of pore throat, the reservoir is divided into two groups: moderate permeability reservoir with moderate pore and small throat and low permeability reservoir. the latter is further classified into three types: moderate pore and small throat reservoir, small pore and unhomogeneous and subtle throat reservoir, and small pore and homogeneous and subtle throat reservoir. These classifications of reservoir will guide the future exploration for this area.

Key words: Sanzhao sag, Fuyu oil layer, Low-moderate permeability reservoir, Pore structure, Classified evaluation.

中图分类号: 

  • TE122.2+3

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