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现代地质 ›› 2020, Vol. 34 ›› Issue (06): 1205-1213.DOI: 10.19657/j.geoscience.1000-8527.2020.044

• 石油地质学 • 上一篇    下一篇

基于CT扫描数字岩心的岩石微观结构定量表征方法

赵建鹏1,2(), 崔利凯3(), 陈惠4, 李宁5, 王自亮4, 马瑶1, 杜贵超1   

  1. 1.西安石油大学 地球科学与工程学院,陕西 西安 710065
    2.陕西省油气成藏地质学重点实验室,陕西 西安 710065
    3.东北石油大学 陆相页岩油气成藏及高效开发教育部重点实验室,黑龙江 大庆 163318
    4.中国石油集团测井有限公司 长庆分公司,陕西 西安 710201
    5.中国石油新疆油田分公司 重油开发公司,新疆 克拉玛依 834000
  • 收稿日期:2020-01-21 修回日期:2020-04-25 出版日期:2020-12-22 发布日期:2020-12-22
  • 通讯作者: 崔利凯
  • 作者简介:崔利凯,男,博士,讲师,1988年出生,地质资源与地质工程专业,主要从事数字岩心建模及数字井筒构建方法研究。Email:cui_lk@nepu.edu.cn
    赵建鹏,男,博士,讲师,1987年出生,地质资源与地质工程专业,主要从事测井储层评价和岩石物理属性模拟研究。Email:zjpsnow@126.com
  • 基金资助:
    国家自然科学基金项目(41804125);陕西省自然科学基础研究计划项目(2018JQ4043);陕西省教育厅科研计划项目(18JK0619)

Quantitative Characterization of Rock Microstructure of Digital Core Based on CT Scanning

ZHAO Jianpeng1,2(), CUI Likai3(), CHEN Hui4, LI Ning5, WANG Ziliang4, MA Yao1, DU Guichao1   

  1. 1. School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, Shaanxi 710065, China
    2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi’an, Shaanxi 710065, China
    3. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
    4. Changqing Division, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710201, China
    5. Heavy Oil Development Company, Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
  • Received:2020-01-21 Revised:2020-04-25 Online:2020-12-22 Published:2020-12-22
  • Contact: CUI Likai

摘要:

岩石微观结构是决定储层宏观物理属性的关键参数,CT扫描数字岩心技术能够实现岩石微观结构的三维可视化和精细化定量表征。以东海盆地西湖凹陷中央反转带北部花港组储层岩样为例开展研究,首先通过CT扫描图像处理建立三维数字岩心,再利用图像处理算法、“最大球”算法分别对样品的粒度分布和孔隙结构两方面进行空间可视化和定量分析。研究结果表明:研究区花港组储层岩石颗粒直径主要分布区间为100~300 μm,属于细砂岩类型,颗粒直径大小不同导致孔隙结构存在差异。不同物性储层的孔隙连通性与孔隙结构参数差异较大,非连通孔隙主要以孤立孔隙为主。孔隙半径主要分布范围为20~60 μm,喉道半径主要分布范围为3~15 μm,喉道长度分布范围为15~45 μm。孔喉配位数差异较大,主要分布区间为0~4,孔隙和喉道截面形状主要以三角形为主。本研究有助于储层微观参数的定量评价,为岩石微观结构的可视化、定量化表征提供技术支撑。

关键词: CT, 数字岩心, 粒度分析, 孔隙结构, 孔隙网络模型, 西湖凹陷

Abstract:

Rock microstructure is a key parameter that determines the macro-physical reservoir properties. CT core scanning technology can perform three-dimensional (3D) visualization and fine quantitative characterization of rock microstructures. In this paper, rock cores of the Huagang Formation (Fm.) from north of the central inversion zone of the Xihu Sag (East China Sea Basin) are used as an example. Firstly, 3D digital core images were established by CT scanning. Secondly, the image processing algorithm and the “maximum ball” algorithm were used to analyze the samples. The grain size distribution and pore structure are spatially and quantitatively analyzed. The Huagang Fm. rock grain size is mainly 100-300 μm, belonging to fine sandstone. Different grain sizes lead to differences in pore structure, and the reservoir pore connectivity and structural parameters are quite different. Non-connected pores are mainly isolated. The pore radius ranges mainly 20-60 μm, whilst the throat radius and length is 3-15 μm and 15-45 μm, respectively. The pore-throat coordination numbers are quite different (mostly from 0 to 4), and the pores and throats are largely triangular. This study enhances the quantitative evaluation of reservoir micro-parameters, and provides strong technical support for visualizing and quantitative characterizing rock microstructures.

Key words: CT, digital core, grain size analysis, pore structure, pore network model, Xihu Sag

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