Journal of Jilin University(Earth Science Edition) ›› 2022, Vol. 52 ›› Issue (6): 1813-1829.doi: 10.13278/j.cnki.jjuese.20220148

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Fractal Characteristics and Controlling Factors of Pores in Shallow Shale Gas Reservoirs: A Case Study of Longmaxi Formation in Zhaotong Area, Yunnan Province

Zhao Yue1,2,3, Li lei1, Si Yunhang1, Wang Huimin1   

  1. 1.  Mining Institute, Liaoning Technical University, Fuxin 123000, Liaoning, China
    2. Institute of Innovation and Development for Fuxin Transition, Liaoning Technical University, Fuxin 123000, Liaoning, China
    3. Liaoning Province Resource-Based City Sustainable Development Research Base, Fuxin 123000, Liaoning, China
  • Received:2022-05-16 Online:2022-11-26 Published:2022-12-27
  • Supported by:
    the 2022 Science and Technology Think Tank Youth Talent Program China Association for Science and Technology (20220615ZZ07110207) and the “Nurturing Seedlings”  Project of Young Science and Technology Talents of the Department of Education of Liaoning Province （LJ2020QNL003）

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Abstract: In order to quantitatively characterize the complexity of shale pore structures of Longmaxi Formation in Zhaotong national shale gas demonstration zone, Yunnan Province and its influence on shale gas, 24 pieces of shales collected from Longmaxi Formation were tested for TOC mass fraction, whole rock mineral composition and low-temperature nitrogen adsorption. And their influence on fractal dimension of shale pores was analyzed and discussed from two aspects of shale pore structures and mineral composition. The results show that there is a strong heterogeneity in pore development among different sub-layers in Member 1 of Longmaxi Formation in Zhaotong area, with the highest content of organic matter in the Layer 1, with a “three-stage” variation of decreasing-increasing-decreasing in the longitudinal direction. Shale pores are segmented, with fractal dimension D2 ranging from 2.699 4 to 2.912 4, with an average of 2.826 5 and fractal dimension D1 ranging from 2.617 4 to 2.719 4. The pore structures are complex and the fractal dimension is highest in the Layer 1 and gradually decreases upwards. The correlation between fractal dimension of shale with pore structure parameters and geological factors shows that TOC mass fraction and quartz volume fraction control the development of micropores, provide the main specific surface area, and have a good positive correlation with fractal dimension, which is conducive to the occurrence of shale gas, with higher total gas content and adsorbed gas ratio; The volume fraction of clay minerals and dolomite mainly controls the development of mesopores and macropores, provides the main pore volume, and has a negative correlation with fractal dimension. The combination of hydrocarbon generation, reservoir and development factors suggests that Layer 1 and Layer 3 are beneficial to shale gas retention due to their high TOC content, large fractal dimension and strong brittleness, making them become favorable horizons for shale gas development.

Key words: Longmaxi Formation, reservoir, pore structure, fractal dimension, controlling factors, shallow shale gas, Zhaotong area

CLC Number: 

  • P618.12
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