Fractal evolution under in situ pressure and sorption conditions for coal and shale

Abstract Coalbed methane (CBM) and shale gas become two most important unconventional natural gas resources in US. The fractal dimension, known as the degree of self-similarity or irregularity, is an important parameter to quantitatively characterize gas storage capacity and gas transport properties...

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Autores principales:	Rui Zhang, Shimin Liu, Yang Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9ae07de0d228409a8eeea3548c510144
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spelling	oai:doaj.org-article:9ae07de0d228409a8eeea3548c5101442021-12-02T15:05:58ZFractal evolution under in situ pressure and sorption conditions for coal and shale10.1038/s41598-017-09324-92045-2322https://doaj.org/article/9ae07de0d228409a8eeea3548c5101442017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-09324-9https://doaj.org/toc/2045-2322Abstract Coalbed methane (CBM) and shale gas become two most important unconventional natural gas resources in US. The fractal dimension, known as the degree of self-similarity or irregularity, is an important parameter to quantitatively characterize gas storage capacity and gas transport properties in pores of rock matrix. In this study, two coal and two shale samples were evaluated to estimate fractal dimensions using combined small angle X-ray scattering (SAXS), small angle neutron scattering (SANS) and low-pressure N2 adsorption techniques. The results show that surface fractal dimension D s of inaccessible pores is greater than that for total pores based on SANS results for all four tested samples. D s of accessible pores estimated by N2 desorption is greater than that for N2 adsorption for each linear section of each tested sample. Based on in situ SANS results, D s slightly decreases with increasing argon injecting pressure for San Juan coal. D s decreases with increasing methane and CO2 injecting pressure for samples with high D s . However, D s significantly increases when CO2 became liquid phase for samples with low D s . Furthermore, D s almost didn’t change after methane and argon penetrations for all these samples except Marcellus outcrop shale.Rui ZhangShimin LiuYang WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rui Zhang Shimin Liu Yang Wang Fractal evolution under in situ pressure and sorption conditions for coal and shale
description	Abstract Coalbed methane (CBM) and shale gas become two most important unconventional natural gas resources in US. The fractal dimension, known as the degree of self-similarity or irregularity, is an important parameter to quantitatively characterize gas storage capacity and gas transport properties in pores of rock matrix. In this study, two coal and two shale samples were evaluated to estimate fractal dimensions using combined small angle X-ray scattering (SAXS), small angle neutron scattering (SANS) and low-pressure N2 adsorption techniques. The results show that surface fractal dimension D s of inaccessible pores is greater than that for total pores based on SANS results for all four tested samples. D s of accessible pores estimated by N2 desorption is greater than that for N2 adsorption for each linear section of each tested sample. Based on in situ SANS results, D s slightly decreases with increasing argon injecting pressure for San Juan coal. D s decreases with increasing methane and CO2 injecting pressure for samples with high D s . However, D s significantly increases when CO2 became liquid phase for samples with low D s . Furthermore, D s almost didn’t change after methane and argon penetrations for all these samples except Marcellus outcrop shale.
format	article
author	Rui Zhang Shimin Liu Yang Wang
author_facet	Rui Zhang Shimin Liu Yang Wang
author_sort	Rui Zhang
title	Fractal evolution under in situ pressure and sorption conditions for coal and shale
title_short	Fractal evolution under in situ pressure and sorption conditions for coal and shale
title_full	Fractal evolution under in situ pressure and sorption conditions for coal and shale
title_fullStr	Fractal evolution under in situ pressure and sorption conditions for coal and shale
title_full_unstemmed	Fractal evolution under in situ pressure and sorption conditions for coal and shale
title_sort	fractal evolution under in situ pressure and sorption conditions for coal and shale
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9ae07de0d228409a8eeea3548c510144
work_keys_str_mv	AT ruizhang fractalevolutionunderinsitupressureandsorptionconditionsforcoalandshale AT shiminliu fractalevolutionunderinsitupressureandsorptionconditionsforcoalandshale AT yangwang fractalevolutionunderinsitupressureandsorptionconditionsforcoalandshale
_version_	1718388660436467712

Fractal evolution under in situ pressure and sorption conditions for coal and shale

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