低-中煤级构造煤纳米孔分形模型适用性及分形特征

宋昱; 姜波; 李凤丽; 闫高原; 么玉鹏

doi:10.3799/dqkx.2017.566

Volume 43 Issue 5

May 2018

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Article Navigation > Earth Science > 2018 > 43(5): 1611-1622

Song Yu, Jiang Bo, Li Fengli, Yan Gaoyuan, Yao Yupeng, 2018. Applicability of Fractal Models and Nanopores' Fractal Characteristics for Low-Middle Rank Tectonic Deformed Coals. Earth Science, 43(5): 1611-1622. doi: 10.3799/dqkx.2017.566

Citation:

Song Yu, Jiang Bo, Li Fengli, Yan Gaoyuan, Yao Yupeng, 2018. Applicability of Fractal Models and Nanopores' Fractal Characteristics for Low-Middle Rank Tectonic Deformed Coals. Earth Science, 43(5): 1611-1622. doi: 10.3799/dqkx.2017.566

Citation:

Song Yu, Jiang Bo, Li Fengli, Yan Gaoyuan, Yao Yupeng, 2018. Applicability of Fractal Models and Nanopores' Fractal Characteristics for Low-Middle Rank Tectonic Deformed Coals. Earth Science, 43(5): 1611-1622. doi: 10.3799/dqkx.2017.566

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Applicability of Fractal Models and Nanopores' Fractal Characteristics for Low-Middle Rank Tectonic Deformed Coals

doi: 10.3799/dqkx.2017.566

Song Yu^{1,2
,},
Jiang Bo^{1,2
,
,},
Li Fengli^1,2,
Yan Gaoyuan^1,2,
Yao Yupeng^1,2

1.
School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China
2.
Key Laboratory of Coal Bed Methane Resource & Reservoir Formation Process, Ministry of Education, China University of Mining & Technology, Xuzhou 221008, China

Received Date: 2017-10-01
Publish Date: 2018-05-15

Abstract

Abstract

The investigations of nanopore heterogeneity in tectonically deformed coals are of significance for the study of occurrence state and transmission characteristics of coalbed methane (CBM). The low-middle rank tectonic deformed coals were screened out firstly in this study and then the matrix compressibility and the applicabilities of Menger, thermodynamics, Sierpinski, and FHH of tectonic deformed coals, as well as the fractal characteristics, were analyzed based on high-pressure mercury intrusion and low-pressure gas adsorption.The fractal curves of Menger model for mylonitic coals can be divided into three stages. However, for primary coals, cataclastic coals, schistose coals, scaly coals, and wrinkle coals, the fractal curves of Sierpinski, Menger, thermodynamics, and FHH can be obviously divided into two stages and the piecewise points locates at 100 nm, 72 nm, 72 596 nm, and 8 nm respectively. The fractal dimensions of Menger model are >3 and have a fitting deviation, so it is not suitable to characterize the pore heterogeneity. The Sierpinski model is suitable to characterize the fractal characteristics of the nanopore of the tectonic deformed coals whereas the FHH model is for the pores of 8-100 nm in primary coals and various tectonic deformed coals. The fractal dimension (D_s1) of micron pores at Sierpinski fractal curve (>100 nm) increases firstly and then decreases with the increase of tectonic deformation, reaching the highest values in schistose coals. The heterogeneity of both nanopores at Sierpinski fractal curve (< 100 nm, D_s2c) and that of pores of 8-100 nm at FHH fractal curve increase with the enhancement of the tectonic deformation. In primary coals and brittle deformed coals, D_s1 > D_s2c, indicating that the heterogeneity of micron pores are stronger than that of nanopores. In scaly coals, D_s1 is close to D_s2c. In wrinkle coals, D_s1 < D_s2c, indicating that the heterogeneity of nanopores is stronger than that of micron pores.
- tectonic deformed coals,
- nanopore,
- matrix compressibility,
- fractal characteristics,
- applicability of model

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Applicability of Fractal Models and Nanopores' Fractal Characteristics for Low-Middle Rank Tectonic Deformed Coals

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