岩性油气藏 ›› 2018, Vol. 30 ›› Issue (2): 120–128.doi: 10.12108/yxyqc.20180213

• 技术方法 • 上一篇    下一篇

裂缝对岩石电阻率的影响及其在含气饱和度计算中的应用

刘智颖1,2, 章成广1,2, 唐军1,2, 肖承文3   

  1. 1. 长江大学 油气资源与勘探技术教育部重点实验室, 武汉 430100;
    2. 长江大学 地球物理与石油资源学院, 武汉 430100;
    3. 中国石油塔里木油田分公司 勘探开发研究院, 新疆 库尔勒 841008
  • 收稿日期:2017-10-16 修回日期:2018-01-18 出版日期:2018-03-21 发布日期:2018-03-21
  • 第一作者:刘智颖(1985-),男,长江大学在读博士研究生,研究方向为地球探测与信息技术。地址:(430100)湖北省武汉市蔡甸区大学路特1号长江大学武汉校区。Email:lzykkww102@163.com。
  • 通信作者: 章成广(1963-),男,博士,教授,博士生导师,主要从事岩石物理学及声波测井方法等方面的研究与教学工作。Email:zhangcg@yangtzeu.edu.cn。
  • 基金资助:
    国家自然科学基金项目“基于声波测井数值与实验模拟的裂缝性储层渗透率定量评价方法研究”（编号：41372136）资助

Influence of fracture on rock resistivity and its application in saturation calculation

LIU Zhiying1,2, ZHANG Chengguang1,2, TANG Jun1,2, XIAO Chengwen3   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China;
    3. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841008, Xinjiang, China
  • Received:2017-10-16 Revised:2018-01-18 Online:2018-03-21 Published:2018-03-21

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摘要： 裂缝性致密砂岩储层含气饱和度计算的准确性取决于岩石电阻率测量值的可靠程度，而岩石电阻率的测量值又受控于裂缝的导电性、产状、宽度和密度等参数。因此，研究裂缝对岩石电阻率测量值的影响是正确建立致密砂岩储层含气饱和度计算公式的基础。在数值模拟基础上详细观察裂缝的导电性、产状、宽度和密度等参数对岩石电阻率测量值的影响，通过岩电实验对数值模拟结果进行检验，提出了一个适用于裂缝性致密砂岩储层含气饱和度计算的归一化岩石电阻率公式，改进了目前常用的双重孔隙介质模型。最后，将改进的双重孔隙介质模型用于塔里木盆地克深地区裂缝性致密砂岩储层的含气饱和度计算。计算结果表明，改进的双重孔隙介质模型符合克深地区岩石裂缝内含气饱和度高的特点，且与试油结论吻合度更高。

关键词: 煤层气, 高阶煤, 赋存特征, 开采技术, 多煤层, 小林华矿区, 黔北地区

Abstract: The accuracy of gas saturation calculation in fractured tight sandstone reservoir depends on the reliability of rock resistivity measurement, and the measurement of rock resistivity is controlled by the conductivity, occurrence, width and density of fractures. Therefore, the study of the influence of fracture on rock resistivity measurement is the foundation for establishing a formula for calculating the gas saturation of tight sandstone reservoirs. On the basis of numerical simulation, the influences of fracture conductivity, occurrence, width and density on the measurement of rock resistivity were observed. The results of numerical simulation were checked through rock resistivity experiment, and a normalized formula of rock resistivity suitable for calculating gas saturation of fractured tight sandstone reservoir was put forward, improving the dual porosity model commonly used for saturation calculation of fractured reservoirs. Finally, the improved dual porosity model was used to calculate the gas saturation of the fractured tight sandstone reservoirs in Keshen area of Tarim Basin. The calculation results show that the results of the improved dual porosity model are consistent with the characteristics of high gas saturation in rock fracture in Keshen area, and more consistent with the oil testing conclusion.

Key words: coalbed methane, high rank coal, occurrence characteristics, mining technology, multi-seams, Xiaolinhua coal mine, northern Guizhou

中图分类号: 

  • TE135
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