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

机译：不同粒径页岩孔隙结构表征的实验研究

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摘要

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 cm(3) / 100 g to 0.501 cm(3) / 100 g with an increment almost 40%, while the volume of macropores decreases from 0.732 cm(3) / 100 g to 0.260 cm(3) / 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 D-1 and D-2, respectively. D-1 increases with the decrease of particle size of shale, while D-2 shows an opposite tendency in both shale samples.
机译：为了研究粒度对确定页岩孔隙结构的影响，选择了四川盆地奥陶系五峰组（WF）和志留系龙马溪组页岩（LMX）的露头，并将其破碎成各种粒径。然后，通过使用低压气体吸附（LPGA）测试分析孔结构。结果表明，页岩孔隙主要由狭缝型孔隙和开孔孔隙组成。页岩的比表面积主要由微孔引起，而页岩总孔体积的最大比例由中孔引起。随着粒径的减小，两个样品的比表面积均减小，而平均孔径和总孔体积逐渐增大。粒度对微孔和大孔的孔隙结构参数的影响更大，随着粒度从2.36 mm减小到0.075 mm，Longmaxi页岩中的微孔体积从0.283 cm（3）/ 100 g增加到0.501 cm （3）/ 100 g，几乎增加了40％，而大孔的体积从0.732 cm（3）/ 100 g，减少到0.260 cm（3）/ 100 g，减少了约50％。这项研究确定了相对压力为0-0.50和0.50-0.995时的分形维数分别为D-1和D-2。 D-1随着页岩粒度的减小而增加，而D-2在两个页岩样品中均显示相反的趋势。

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  • 来源
    《Journal of Energy Resources Technology》 |2018年第5期|054502.1-054502.10|共10页
  • 作者

    Zhang Shuwen; Xian Xuefu; Zhou Junping; Liu Guojun; Guo Yaowen; Zhao Yuan; Lu Zhaohui;

  • 作者单位

    Chongqing Univ, Coll Resource & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, 174 Sha Zheng St, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Resource & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, 174 Sha Zheng St, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Resource & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, 174 Sha Zheng St, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Resource & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, 174 Sha Zheng St, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Resource & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, 174 Sha Zheng St, Chongqing 400044, Peoples R China;

    Chongqing Univ, Coll Resource & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, 174 Sha Zheng St, Chongqing 400044, Peoples R China;

    Chongqing Inst Geol & Mineral Resources, 177-9 Changjiang 2nd Rd, Chongqing 400042, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
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