Pore Fractal Characteristics of Different Macro-Coal Components and Influence on Adsorption/Desorption: A Case Study in the Huanglong Jurassic Coalfield

Ma, Zhuoyuan; Chen, Yue; Ma, Dongmin; Li, Guofu; Li, Weibo; Ji, Yusong; Zheng, Chao; Wang, Liya; Wang, Xin

doi:10.1021/acsomega.2c04793

Cited by 4 publications

(1 citation statement)

References 44 publications

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“… 41 In high-vitrinite-content coals, gas migration is less affected by moisture, and gas desorbs more easily. (3) For pore structures, in vitrinite, micropores are more developed, which provides a higher pore-specific surface area for CBM adsorption, 42 , 43 which increases the adsorption capacity. The larger the pressure difference that forms during desorption, the more gas that is emitted at the initial desorption stage, which accelerates desorption and increases cumulative desorption volume.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Characteristics and Influence Factors of Natural Desorption in Coal Bodies from Fukang Mining Area, Xinjiang, China

Du,

Huang,

Wang

et al. 2023

ACS Omega

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Coal body desorption characteristics are one of the key factors that influence the development of coalbed methane (CBM). In this study, 91 coal core samples from 11 CBM wells in the Fukang mining area were collected from Xinjiang, China, and the coal quality, high-pressure mercury compression, gas content, and natural desorption characteristics measurements were launched. With the detailed analyses of the differences in cumulative desorption volume, desorption ratio, and on-site average desorption rate for the coal samples with different body structures and macrolithotypes, the influence of the maximum reflectance of vitrinite, microscopic coal rock composition, and coal quality and pore characteristics on CBM desorption characteristics were discussed. The results showed that the cumulative desorption volume, desorption ratio, and desorption rate of cataclastic structure-bright coal are higher than those of primary structure-semibright coal. With the increase of R O,max and vitrinite content, the adsorption capacity of coal increases, and the increased methane concentration difference during desorption leads to an increase in cumulative desorption volume and on-site average desorption rate. The higher contents of moisture and ash yield would occupy the adsorption sites and hinder gas diffusion, which would decrease the desorption of coalbed methane. The greater porosity/pore volume ratio of medium and large pores can enhance the connectivity of pores, which increases the desorption ratio and the average desorption rate, while the higher micropore porosity/pore volume ratio can increase the gas adsorption space and the cumulative desorption volume. The pore characteristics have the most significant effect on the cumulative desorption volume and desorption ratio. The results of the study can help guide coal mine gas management and CBM development from middle-and low-rank coal reservoirs in Xinjiang.

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Section: Analysis and Discussionmentioning

confidence: 99%

Characteristics and Influence Factors of Natural Desorption in Coal Bodies from Fukang Mining Area, Xinjiang, China

Du,

Huang,

Wang

et al. 2023

ACS Omega

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Detailed Characterization of Microscopic Pore Structure in Low-Rank Coal: A Case Study of Zhalainuoer Coalfield

Ma,

Tao,

Gao

et al. 2024

Nat Resour Res

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Experimental investigation on pore characteristics of vitrain and durain in low rank coal based on fractal theory

Zheng,

Chen,

et al. 2024

Sci Rep

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The macro petrographic compositions and its pore characteristics of coal reservoir play critical role in the accumulation and development of coalbed methane (CBM). In this paper, the pore characteristics of vitrain and durain were analyzed through the experiment and fractal theory. The results indicated that the micropores and microfractures develop in vitrain, and that transitional pores develop in durain. The pore volume and specific surface area (SSA) of vitrain are larger than those of durain, with the micropore SSA of vitrain being 35% higher than that of durain. The threshold pressure and tortuosity of vitrain are greater than that of durain, but the mean pore size of vitrain is smaller than that of durain. The fractal dimension D1 of vitrain is greater than that of durain, while the fractal dimension D2 is opposite, indicating that the pore surface of vitrain is coarser, and the pore structure of durain is more complex. The fractal dimension Dk of vitrain is larger than that of durain, the mean fractal dimension Ds of vitrain is smaller than that of durain, which shows that the diffusivity of vitrain is weak but the seepage capacity is strong due to the developed fractures. The difference in material composition and pore characteristics between vitrain and durain provides a new understanding for the development of CBM in low rank coal.

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Pore Fractal Characteristics of Different Macro-Coal Components and Influence on Adsorption/Desorption: A Case Study in the Huanglong Jurassic Coalfield

Cited by 4 publications

References 44 publications

Characteristics and Influence Factors of Natural Desorption in Coal Bodies from Fukang Mining Area, Xinjiang, China

Characteristics and Influence Factors of Natural Desorption in Coal Bodies from Fukang Mining Area, Xinjiang, China

Detailed Characterization of Microscopic Pore Structure in Low-Rank Coal: A Case Study of Zhalainuoer Coalfield

Experimental investigation on pore characteristics of vitrain and durain in low rank coal based on fractal theory

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