Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 22-35.doi: 10.12108/yxyqc.20200603

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Relationship between multifractal characteristics of pore size and lithofacies of shale of Shahezi Formation in Changling fault depression，Songliao Basin

LIANG Zhikai1,2, LI Zhuo1,2, LI Lianxia3, JIANG Zhenxue1,2, LIU Dongdong1,2, GAO Fenglin1,2, LIU Xiaoqing4, XIAO Lei1,2, YANG Youdong1,2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Institute of Unconventional Natural Gas, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
  • Received:2020-02-26 Revised:2020-06-27 Online:2020-12-01 Published:2020-10-30

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Abstract: In order to analyze the heterogeneity of pore size distribution of different shale lithofacies and its influencing factors,the pore structure of eight types of shale lithofacies of Shahezi Formation in Changling fault depression was characterized by CO2 and N2 adsorption experiments,and the heterogeneity of pore size distribution was studied by multifractal theory. The results show that:for micro pores,organic-rich clay shale has the largest pore volume and specific surface area,and organic-rich mixed shale has the smallest pore volume and specific surface area;for meso-macropores,organic-rich mixed shale has the largest pore volume,and organic clay shale has the smallest pore volume and specific surface area. With the increase of q,the generalized fractal dimension Dq of gas adsorption curve decreases,the multifractal singular spectral function α-f (α)presents a continuous distribution, indicating that the shale pore size distribution has multiple fractal features. In the micropores, the organicrich siliceous shale has the smallest dispersion of pore size distribution,however,the heterogeneity of organic-rich mixed shale is the largest. In the meso-macropores, organic-rich siliceous shale lithofacies has the strongest heterogeneity and the smallest dispersion of pore size distribution. Micropores have a lower overall heterogeneity, comparing with meso-macropores. Based on partial least squares regression analysis,there are significant differences in the influence of different rock components on lithofacies,and TOC content is the main factor affecting pore heterogeneity. Based on the multifractal theory,the research results can reveal the difference of pore size distribution characteristics from different lithofacies,and can provide guidance for shale reservoir development of Shahezi Formation in Changling fault depression, Songliao Basin.

Key words: multifractal dimension, heterogeneity, continental shale, Shahezi Formation, Changling fault depression, Songliao Basin

CLC Number: 

  • P618.13
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