岩性油气藏 ›› 2020, Vol. 32 ›› Issue (5): 113–121.doi: 10.12108/yxyqc.20200512

• 油气地质 • 上一篇    下一篇

页岩纳米孔隙的结构量化表征——以川东南地区五峰组为例

郭娟1, 赵迪斐1,2, 梁孝柏1, 杨坤1, 李昊轩1, 龙代玺1   

  1. 1. 中国矿业大学 资源与地球科学学院, 江苏 徐州 221116;
    2. 煤层气资源与成藏过程教育部重点实验室, 江苏 徐州 221008
  • 收稿日期:2019-11-12 修回日期:2020-01-23 出版日期:2020-10-01 发布日期:2020-08-08
  • 第一作者:郭娟(1998-),女,研究方向为非常规油气地质学。地址:(221116)江苏省徐州市铜山区大学路1号中国矿业大学南湖校区。Email:3249816205@qq.com
  • 通信作者: 赵迪斐(1991-),男,中国矿业大学、昆士兰大学联合培养在读博士研究生,研究方向为非常规油气地质学与纳米地球科学。Email:diffidiffi@126.com。
  • 基金资助:
    中国矿业大学大学生创新基金“基于图像处理与机器识别的页岩纳米尺度孔隙定量表征：以渝东南地区五峰组—龙马溪组页岩为例”（编号：DCXM201919）、重庆页岩气公司科研项目“不同来源石英对页岩储层物性和含气性的控制作用研究”（编号：CYS-FW-2019-0099）、刘宝珺地学青年科学基金“五峰组—龙马溪组页岩沉积精细微相特征及其对储层发育的控制”（编号：DMSMX2019002）和重庆市绩效激励引导专项“石英对页岩储层纵向非均质性的控制作用”（编号：cstc2018jxj190002）联合资助

Quantitative characterization of shale nanopore structure: a case study of Wufeng Formation in southeastern Sichuan

GUO Juan1, ZHAO Difei1,2, LIANG Xiaobo1, YANG Kun1, LI Haoxuan1, LONG Daixi1   

  1. 1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
    2. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China
  • Received:2019-11-12 Revised:2020-01-23 Online:2020-10-01 Published:2020-08-08

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摘要： 为探究页岩纳米孔隙结构量化的新方法，以川东南地区五峰组页岩储层样品为例，通过氩离子抛光-场发射扫描电镜技术获取高分辨率纳米尺度孔隙图像，运用Adobe Photoshop，Adobe Illustrator，Image J等软件进行纳米尺度孔隙图像的数值化处理，并提取纳米孔隙的发育特征与结构参数。结果表明：五峰组页岩储层样品主要发育4种类型的纳米孔隙，分别为有机质孔隙、矿物粒内结构孔隙、矿物粒内溶蚀孔隙以及微裂隙等，其中有机质孔隙最为发育；通过图像信息提取，获取每个孔隙的形状因子、圆度、伸长率、偏心率、熵值等量化参数，并基于对孔隙不同参数的交会图综合表征，提出一种对页岩不同类型孔隙进行量化表征的方法。对纳米孔隙精细量化的研究，可以为相关研究提供参考，为孔隙结构表征及优质页岩储层发育机理研究提供新思路、新方法。

关键词: 纳米孔隙, 页岩, 量化表征, 图像数值化, 图像处理, 五峰组, 川东南地区

Abstract: In order to explore a new method of shale nanopore structure quantification,taking shale reservoir samples of Wufeng Formation in southeastern Sichuan area as an example,high-resolution nanopore images were obtained by argon ion polishing(AIP)and field emission scanning electron microscopy(FE-SEM). The nanoscale pore images were numerically processed by Adobe Photoshop, Adobe Illustrator,Image J,and the development characteristics and structural parameters of nanopores were quantitatively extracted. The results show that four major types of nanopores are developed in shale reservoirs of Wufeng Formation, including organic pores, mineral intragranular structural pores,mineral intragranular dissolved pores and micro fractures,among which organic pores are the predominant pores. Through image information extraction,the quantitative parameters such as shape factor,roundness,elongation,eccentricity and entropy value for each pore were obtained,and a quantitative characterization method for different types of pores in shale was proposed based on the intersection of different parameters of pores. The study of quantification of nanopores is helpful to provide new approaches for the study on pore structure characterization and formation mechanism of high-quality shale reservoirs.

Key words: nanopore, shale, quantitative characterization, image digitization, image processing, Wufeng Formation, southeastern Sichuan

中图分类号: 

  • TE132.2
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