Pore size distributions and pore multifractal characteristics of medium and low-rank coals

Pore size distributions and pore multifractal characteristics of medium and low-rank coals

Abstract It is of great significance to study the porosity and permeability properties of medium and low-rank coal. The porosity and permeability in confining stress experiments were used to simulate the porosity and permeability variations of coal samples under different depth conditions. The pore...

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Autores principales: Bin Sun, Qing Yang, Jie Zhu, Tangsha Shao, Yuhang Yang, Chenyu Hou, Guiyou Li
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2020
Materias:
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Science
Q
Acceso en línea:https://doaj.org/article/63b6be4e8c1444bd9381077daa87305e
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spelling oai:doaj.org-article:63b6be4e8c1444bd9381077daa87305e2021-12-02T12:40:41ZPore size distributions and pore multifractal characteristics of medium and low-rank coals10.1038/s41598-020-79338-32045-2322https://doaj.org/article/63b6be4e8c1444bd9381077daa87305e2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79338-3https://doaj.org/toc/2045-2322Abstract It is of great significance to study the porosity and permeability properties of medium and low-rank coal. The porosity and permeability in confining stress experiments were used to simulate the porosity and permeability variations of coal samples under different depth conditions. The pore structure of Baoqing coal samples is greatly affected by the confining pressure, and the pores and micro cracks are more easily compressed. Based on the experimental data of mercury intrusion porosimetry (MIP) and nitrogen adsorption (NA), the pore size distributions (PSDs) of medium and low-rank coals were studied. High mercury intrusion pressure would lead to coal matrix compression. Therefore, the pore volume calculated by MIP data was corrected by NA data. The PSDs characteristics of Jixi (JX) coal and Baoqing (BQ) coal samples are obtained from the revised pore volume, and the dominant pores of medium and low-rank coals are obtained. The results show that JX coal has higher spatial heterogeneity, connectivity and pore autocorrelation. Micro fractures have an influence on the autocorrelation and heterogeneity of coal samples, especially for BQ coal samples.Bin SunQing YangJie ZhuTangsha ShaoYuhang YangChenyu HouGuiyou LiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-12 (2020)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Bin Sun
Qing Yang
Jie Zhu
Tangsha Shao
Yuhang Yang
Chenyu Hou
Guiyou Li
Pore size distributions and pore multifractal characteristics of medium and low-rank coals
description Abstract It is of great significance to study the porosity and permeability properties of medium and low-rank coal. The porosity and permeability in confining stress experiments were used to simulate the porosity and permeability variations of coal samples under different depth conditions. The pore structure of Baoqing coal samples is greatly affected by the confining pressure, and the pores and micro cracks are more easily compressed. Based on the experimental data of mercury intrusion porosimetry (MIP) and nitrogen adsorption (NA), the pore size distributions (PSDs) of medium and low-rank coals were studied. High mercury intrusion pressure would lead to coal matrix compression. Therefore, the pore volume calculated by MIP data was corrected by NA data. The PSDs characteristics of Jixi (JX) coal and Baoqing (BQ) coal samples are obtained from the revised pore volume, and the dominant pores of medium and low-rank coals are obtained. The results show that JX coal has higher spatial heterogeneity, connectivity and pore autocorrelation. Micro fractures have an influence on the autocorrelation and heterogeneity of coal samples, especially for BQ coal samples.
format article
author Bin Sun
Qing Yang
Jie Zhu
Tangsha Shao
Yuhang Yang
Chenyu Hou
Guiyou Li
author_facet Bin Sun
Qing Yang
Jie Zhu
Tangsha Shao
Yuhang Yang
Chenyu Hou
Guiyou Li
author_sort Bin Sun
title Pore size distributions and pore multifractal characteristics of medium and low-rank coals
title_short Pore size distributions and pore multifractal characteristics of medium and low-rank coals
title_full Pore size distributions and pore multifractal characteristics of medium and low-rank coals
title_fullStr Pore size distributions and pore multifractal characteristics of medium and low-rank coals
title_full_unstemmed Pore size distributions and pore multifractal characteristics of medium and low-rank coals
title_sort pore size distributions and pore multifractal characteristics of medium and low-rank coals
publisher Nature Portfolio
publishDate 2020
url https://doaj.org/article/63b6be4e8c1444bd9381077daa87305e
work_keys_str_mv AT binsun poresizedistributionsandporemultifractalcharacteristicsofmediumandlowrankcoals
AT qingyang poresizedistributionsandporemultifractalcharacteristicsofmediumandlowrankcoals
AT jiezhu poresizedistributionsandporemultifractalcharacteristicsofmediumandlowrankcoals
AT tangshashao poresizedistributionsandporemultifractalcharacteristicsofmediumandlowrankcoals
AT yuhangyang poresizedistributionsandporemultifractalcharacteristicsofmediumandlowrankcoals
AT chenyuhou poresizedistributionsandporemultifractalcharacteristicsofmediumandlowrankcoals
AT guiyouli poresizedistributionsandporemultifractalcharacteristicsofmediumandlowrankcoals
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