Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 76-82.doi: 10.12108/yxyqc.20180609

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Fractal characteristics of pore structure and permeability calculation for tight sandstone reservoirs: a case of Penglaizhen Formation and Shaximiao Formation in Western Sichuan Depression

DENG Haoyang1,2, SIMA Liqiang1,2, WU Wen3, LIU Fanglin4, WANG Xin5, WANG Chao6, YANG Guodong7   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Shunan Gas Mine, PetroChina Southwest Oil and Gas Field Company, Luzhou 646000, Sichuan, China;
    4. PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    5. Chongqing Gas Mine, PetroChina Southwest Oil and Gas Field Company, Zhongxian 404300, Chongqing, China;
    6. Research Institute, Shaanxi Yanchang Petroleum(Group) Limited Liability Company, Xi'an 710000, China;
    7. School of High Technology, Xi'an University of Technology, Xi'an 710109, China
  • Received:2018-05-07 Revised:2018-07-18 Online:2018-11-16 Published:2018-11-16

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Abstract: In order to clarify the influence of fractal dimension on macroscopic reservoir physical properties and improve permeability calculation accuracy, high pressure mercury injection experiments were carried out on 12 cores of tight sandstone gas reservoirs in Penglaizhen and Shaximiao Formation in Western Sichuan Depression. All the curves of mercury intrusion were processed by fractal model based on capillary tubes. Combined with poro-sity and permeability, the correlation between fractal dimension and pore structure parameters was analyzed. Through theoretical analysis and many times of trial, Dave, Pf and R50 were finally selected to calculate permeabi-lity by multiple nonlinear regression. The results show that the pore structure in tight sandstone could be divided into four types. The pore structures of big and small pores are relatively independent, and the relationships between fractal dimensions and pore structure parameters are complex. The calculated permeability by multiple nonlinear regression shows strong correlation with measured permeability, whose correlation coefficient squared is more than 0.9. The established model by multiple nonlinear regression shows more accurate in permeability calculation and it provides another thought for permeability calculation.

Key words: pore structure, fractal theory, tight sandstone, Western Sichuan Basin

CLC Number: 

  • TE122
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