Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks

The accurate characterization of coal pore structure is significant for coalbed methane (CBM) development. The splicing of practical pore ranges of multiple test methods can reflect pore structure characteristics. The pore\fracture compressibility is the main parameter affecting the porosity and per...

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Autores principales:	Jielin Lu, Xuehai Fu, Junqiang Kang, Ming Cheng, Zhenzhi Wang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	pore\fracture structure full pore characterization matrix compressibility pore\fracture compressibility different coal ranks Science Q
Acceso en línea:	https://doaj.org/article/542d366e3d0146ac84656d62d63617dd
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spelling	oai:doaj.org-article:542d366e3d0146ac84656d62d63617dd2021-12-01T02:46:26ZCharacterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks2296-646310.3389/feart.2021.764853https://doaj.org/article/542d366e3d0146ac84656d62d63617dd2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.764853/fullhttps://doaj.org/toc/2296-6463The accurate characterization of coal pore structure is significant for coalbed methane (CBM) development. The splicing of practical pore ranges of multiple test methods can reflect pore structure characteristics. The pore\fracture compressibility is the main parameter affecting the porosity and permeability of coal reservoirs. The difference in compressibility of different coal rank reservoirs and pore\fracture structures with changing stress have not been systematically found. The pore structure characteristics of different rank coal samples were characterized using the optimal pore ranges of high-pressure mercury intrusion (HPMI), low-temperature liquid nitrogen adsorption (LT-N2A), low-pressure carbon dioxide adsorption (LP-CDA), and nuclear magnetic resonance (NMR) based on six groups of different rank coal samples. The compressibility of coal matrix and pore\fracture were studied using HPMI data and NMR T2 spectrum under effective stress. The results show that the more accurate full pore characterization results can be obtained by selecting the optimal pore range measured by HPMI, LT-N2A, and LP-CDA and comparing it with the NMR pore results. The matrix compressibility of different rank coal samples shows that low-rank coal > high-rank coal > medium-rank coal. When the effective stress is less than 6 MPa, the microfractures are compressed rapidly, and the compressibility decreases slowly when the effective stress is more than 6 MPa. Thus, the compressibility of the adsorption pore is weak. Nevertheless, the adsorption pore has the most significant compression space because of the largest proportion in different pore structures. The variation trend of matrix compressibility and pore\fracture compressibility is consistent with the increase of coal rank. The compressibility decreases with the rise of reservoir heterogeneity and mechanical strength. The development of pore volume promotes compressibility. The research results have guiding significance for the exploration and development of CBM in different coal rank reservoirs.Jielin LuXuehai FuJunqiang KangMing ChengZhenzhi WangFrontiers Media S.A.articlepore\fracture structurefull pore characterizationmatrix compressibilitypore\fracture compressibilitydifferent coal ranksScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	pore\fracture structure full pore characterization matrix compressibility pore\fracture compressibility different coal ranks Science Q
spellingShingle	pore\fracture structure full pore characterization matrix compressibility pore\fracture compressibility different coal ranks Science Q Jielin Lu Xuehai Fu Junqiang Kang Ming Cheng Zhenzhi Wang Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks
description	The accurate characterization of coal pore structure is significant for coalbed methane (CBM) development. The splicing of practical pore ranges of multiple test methods can reflect pore structure characteristics. The pore\fracture compressibility is the main parameter affecting the porosity and permeability of coal reservoirs. The difference in compressibility of different coal rank reservoirs and pore\fracture structures with changing stress have not been systematically found. The pore structure characteristics of different rank coal samples were characterized using the optimal pore ranges of high-pressure mercury intrusion (HPMI), low-temperature liquid nitrogen adsorption (LT-N2A), low-pressure carbon dioxide adsorption (LP-CDA), and nuclear magnetic resonance (NMR) based on six groups of different rank coal samples. The compressibility of coal matrix and pore\fracture were studied using HPMI data and NMR T2 spectrum under effective stress. The results show that the more accurate full pore characterization results can be obtained by selecting the optimal pore range measured by HPMI, LT-N2A, and LP-CDA and comparing it with the NMR pore results. The matrix compressibility of different rank coal samples shows that low-rank coal > high-rank coal > medium-rank coal. When the effective stress is less than 6 MPa, the microfractures are compressed rapidly, and the compressibility decreases slowly when the effective stress is more than 6 MPa. Thus, the compressibility of the adsorption pore is weak. Nevertheless, the adsorption pore has the most significant compression space because of the largest proportion in different pore structures. The variation trend of matrix compressibility and pore\fracture compressibility is consistent with the increase of coal rank. The compressibility decreases with the rise of reservoir heterogeneity and mechanical strength. The development of pore volume promotes compressibility. The research results have guiding significance for the exploration and development of CBM in different coal rank reservoirs.
format	article
author	Jielin Lu Xuehai Fu Junqiang Kang Ming Cheng Zhenzhi Wang
author_facet	Jielin Lu Xuehai Fu Junqiang Kang Ming Cheng Zhenzhi Wang
author_sort	Jielin Lu
title	Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks
title_short	Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks
title_full	Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks
title_fullStr	Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks
title_full_unstemmed	Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks
title_sort	characterization of full pore and stress compression response of reservoirs with different coal ranks
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/542d366e3d0146ac84656d62d63617dd
work_keys_str_mv	AT jielinlu characterizationoffullporeandstresscompressionresponseofreservoirswithdifferentcoalranks AT xuehaifu characterizationoffullporeandstresscompressionresponseofreservoirswithdifferentcoalranks AT junqiangkang characterizationoffullporeandstresscompressionresponseofreservoirswithdifferentcoalranks AT mingcheng characterizationoffullporeandstresscompressionresponseofreservoirswithdifferentcoalranks AT zhenzhiwang characterizationoffullporeandstresscompressionresponseofreservoirswithdifferentcoalranks
_version_	1718405901759545344

Characterization of Full Pore and Stress Compression Response of Reservoirs With Different Coal Ranks

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