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Technical Brief

Experimental Study of the Pore Structure Characterization in Shale With Different Particle Size

[+] Author and Article Information
Shuwen Zhang

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resource and Environment Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: zhangshw1989@sina.com

Xuefu Xian

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resource and Environment Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: xianxf@cae.cn

Junping Zhou

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resource and Environment Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: zhoujp1982@sina.com

Guojun Liu

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resource and Environment Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: 564780085@qq.com

Yaowen Guo

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resource and Environment Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: 15723058484@163.com

Yuan Zhao

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
College of Resource and Environment Science,
Chongqing University,
No. 174 Sha Zheng Street,
Chongqing 400044, China
e-mail: zhao.yuan@cqu.edu.cn

Zhaohui Lu

Chongqing Institute of Geology and Mineral Resources,
No. 177-9 Changjiang 2nd Road,
Yuzhong District,
Chongqing 400042, China
e-mail: luzhaohui929@126.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 26, 2017; final manuscript received November 24, 2017; published online January 31, 2018. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 140(5), 054502 (Jan 31, 2018) (10 pages) Paper No: JERT-17-1387; doi: 10.1115/1.4039022 History: Received July 26, 2017; Revised November 24, 2017

In order to study the effects of particle size on the determination of pore structure in shale, the outcrop of Ordovician Wufeng (WF) and Silurian Longmaxi shale (LMX) samples from Sichuan basin were chosen and crushed into various particle sizes. Then, pore structure was analyzed by using low-pressure gas adsorption (LPGA) tests. The results show that the pore of shales is mainly composed of slit-type pores and open pores. The specific surface areas of shale are mainly contributed by micropores, while the largest proportion of the total pore volume in shale is contributed by mesopores. With the decreasing of particle size, the specific surface area of both samples is decreased, while average pore diameter and the total pore volume are increased gradually. The influences of particle size on the pore structure parameters are more significant for micropore and macropore, as the particle sizes decrease from 2.36 mm to 0.075 mm, the volume of micropores in Longmaxi shale increases from 0.283 cm3/100 g to 0.501 cm3/100 g with an increment almost 40%, while the volume of macropores decreases from 0.732 cm3/100 g to 0.260 cm3/100 g with a decrement about 50%. This study identified the fractal dimensions at relative pressures of 0–0.50 and 0.50–0.995 as D1 and D2, respectively. D1 increases with the decrease of particle size of shale, while D2 shows an opposite tendency in both shale samples.

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Figures

Grahic Jump Location
Fig. 1

The low temperature carbon dioxide isotherms of shale with different particle sizes (a) WF shale and (b) LMX shale

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Fig. 2

The low temperature nitrogen adsorption–desorption of WF and LMX shale with different particle sizes

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Fig. 3

Pore size distribution of samples (dv is the differential of pore volume to pore diameter)

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Fig. 4

Pore volume distribution of tested samples

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Fig. 5

The surface area distribution of samples with different particle sizes

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Fig. 6

Plots of ln(V) versus ln(ln(P0/P)) reconstructed from low-pressure N2 adsorption isotherms

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Fig. 7

Plots of fractal dimension D1 and D2 versus surface area (a, b), pore volume (c, d) and average pore diameter (e, f) of LMX and WF shale samples with different particle sizes

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Fig. 8

The schematic of shale pore structure (a) closed pore; (b) macropore; and (c) flat-plate open pore

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