Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 55-62.doi: 10.3969/j.issn.1673-8926.2018.01.006

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Pore structure and fractal characteristics of Longmaxi shale in southern Sichuan Basin

CHEN Jukai1,2, ZHU Yanming1,2, CUI Zhaobang1,2, ZHANG Chuanghui1,2   

  1. 1. School of Resource and Earth Science, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
    2. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
  • Received:2017-06-10 Revised:2017-08-01 Online:2018-01-21 Published:2018-01-21

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Abstract: The pore development characteristics of Longmaxi shale in the southern Sichuan Basin have influence on shale gas occurrence and flow process. To scientifically evaluate the influence,the high-pressure mercury intrusion,low-temperature nitrogen and carbon dioxide adsorption were comprehensively used to characterize the pore structure,and the fractal fitting of pores in different size was made to calculate the integrated fractal dimensions,and combined with geochemistry and mineral composition,the influencing factors of the integrated fractal dimensions were discussed. The results indicate that the pore diameter distributions of the samples are multi-modal. The pores in different stages account for the pore volume to some extent,whereas micropores and mesopores account for the pore specific surface area. The pores of Longmaxi shale have self-similarity according with fractals laws,and compared with mesopores and micropores,the structure of macropore is more complex. Considering the pore volume of different pore diameters as the weighted value,the calculated integrated fractal dimensions are from 2.491 to 2.623,with an average of 2.560. The organic carbon content and mineral composition have an obvious controlling effect on the integrated fractal dimension which becomes larger with higher organic carbon content and more complex pore structure. The brittle mineral content is negatively correlated with the integrated fractal dimension,while the maturity and clay minerals have a positive influence on it.

Key words: pore structure, comprehensive characterization, fractal dimension, Longmaxi Formation, southern Sichuan Basin

CLC Number: 

  • TE122
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