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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
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
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
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
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
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
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
luzhaohui929@126.com

1Corresponding author.

ASME doi:10.1115/1.4039022 History: Received July 26, 2017; Revised November 24, 2017

Abstract

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 tests. The results show that the pore of shales are mainly composed of slit-type pores and open pores. Micropore contributes the highest surface area in shale and mesopore accounts the largest proportion of the total pore volume. With the decreasing of particle size, the specific surface area of both samples are decreased, while average pore diameter and the total pore volume are increased gradually. The particle size has more significant influences on the micropore and macropore parameters, as the particle sizes decrease from 2.36 to 0.075 mm, the volume of micropores in Longmaxi shale increases from 0.283 to 0.501cm3/100g with an increment almost 40%, while the volume of macropores decreases from 0.732 to 0.260 cm3/100g 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 shales.

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