Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (2): 120-128.doi: 10.12108/yxyqc.20180213

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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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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

CLC Number: 

  • TE135
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