Pore Structural Features of Granite under Different Temperatures

To explore the effects of thermal actions on the pore structural features of granite, scanning electron microscope (SEM) and mercury injection experiments were carried out on granite after thermal treatment (25 °C to 400 °C). The pore structure was investigated from various perspectives, including t...

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Autores principales:	Hongmei Gao, Yongwei Lan, Nan Guo
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	mercury injection experiment scanning electron microscope (SEM) capillary pressure curve median pore-throat ratio median saturation pressure median pore–throat radius Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/b6a14f581c3641e39864343a43b3c07e
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spelling	oai:doaj.org-article:b6a14f581c3641e39864343a43b3c07e2021-11-11T18:02:40ZPore Structural Features of Granite under Different Temperatures10.3390/ma142164701996-1944https://doaj.org/article/b6a14f581c3641e39864343a43b3c07e2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6470https://doaj.org/toc/1996-1944To explore the effects of thermal actions on the pore structural features of granite, scanning electron microscope (SEM) and mercury injection experiments were carried out on granite after thermal treatment (25 °C to 400 °C). The pore structure was investigated from various perspectives, including the capillary pressure curve, the pore–throat ratio, the median saturation pressure, the median pore–throat radius, the porosity, the pore volume, and the pore size distribution. Based on mercury intrusion test data, the Winland model of permeability prediction was modified for a high-temperature tight granite reservoir. The results showed that: (1) As the temperature rose, the mercury injection curve was gradually flattened, and the mercury ejection efficiency gradually increased. Meanwhile, the pore–throat ratio and the median saturation pressure decreased exponentially, and the pore connectivity was enhanced. (2) The median pore–throat radius and the porosity of granite increased exponentially as the temperature increased. Above 200 °C, the median pore–throat radius and the porosity increased substantially. (3) The pore volumes of the transitional pores, mesopores and macropores, and the total pore volume inside the granite, increased as the temperature rose. Especially above 200 °C, the transitional pores and the mesopores were prominently developed, and the pore volumes of the transitional pores and the mesopores took up a significantly greater proportion of the total pore volume. (4) As the temperature rose, the pore size distribution of granite became more extensive, the pore–throat structure was obviously developed, and the pore–throat connectivity was enhanced. (5) The relationship between the micropores’ characteristic parameters and the macro-permeability in engineering was established though a modified Winland model, and the modified Winland model had a better prediction effect. The findings provide a solid basis for rock geothermal mining projects and related geotechnical engineering.Hongmei GaoYongwei LanNan GuoMDPI AGarticlemercury injection experimentscanning electron microscope (SEM)capillary pressure curvemedian pore-throat ratiomedian saturation pressuremedian pore–throat radiusTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6470, p 6470 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mercury injection experiment scanning electron microscope (SEM) capillary pressure curve median pore-throat ratio median saturation pressure median pore–throat radius Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	mercury injection experiment scanning electron microscope (SEM) capillary pressure curve median pore-throat ratio median saturation pressure median pore–throat radius Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Hongmei Gao Yongwei Lan Nan Guo Pore Structural Features of Granite under Different Temperatures
description	To explore the effects of thermal actions on the pore structural features of granite, scanning electron microscope (SEM) and mercury injection experiments were carried out on granite after thermal treatment (25 °C to 400 °C). The pore structure was investigated from various perspectives, including the capillary pressure curve, the pore–throat ratio, the median saturation pressure, the median pore–throat radius, the porosity, the pore volume, and the pore size distribution. Based on mercury intrusion test data, the Winland model of permeability prediction was modified for a high-temperature tight granite reservoir. The results showed that: (1) As the temperature rose, the mercury injection curve was gradually flattened, and the mercury ejection efficiency gradually increased. Meanwhile, the pore–throat ratio and the median saturation pressure decreased exponentially, and the pore connectivity was enhanced. (2) The median pore–throat radius and the porosity of granite increased exponentially as the temperature increased. Above 200 °C, the median pore–throat radius and the porosity increased substantially. (3) The pore volumes of the transitional pores, mesopores and macropores, and the total pore volume inside the granite, increased as the temperature rose. Especially above 200 °C, the transitional pores and the mesopores were prominently developed, and the pore volumes of the transitional pores and the mesopores took up a significantly greater proportion of the total pore volume. (4) As the temperature rose, the pore size distribution of granite became more extensive, the pore–throat structure was obviously developed, and the pore–throat connectivity was enhanced. (5) The relationship between the micropores’ characteristic parameters and the macro-permeability in engineering was established though a modified Winland model, and the modified Winland model had a better prediction effect. The findings provide a solid basis for rock geothermal mining projects and related geotechnical engineering.
format	article
author	Hongmei Gao Yongwei Lan Nan Guo
author_facet	Hongmei Gao Yongwei Lan Nan Guo
author_sort	Hongmei Gao
title	Pore Structural Features of Granite under Different Temperatures
title_short	Pore Structural Features of Granite under Different Temperatures
title_full	Pore Structural Features of Granite under Different Temperatures
title_fullStr	Pore Structural Features of Granite under Different Temperatures
title_full_unstemmed	Pore Structural Features of Granite under Different Temperatures
title_sort	pore structural features of granite under different temperatures
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b6a14f581c3641e39864343a43b3c07e
work_keys_str_mv	AT hongmeigao porestructuralfeaturesofgraniteunderdifferenttemperatures AT yongweilan porestructuralfeaturesofgraniteunderdifferenttemperatures AT nanguo porestructuralfeaturesofgraniteunderdifferenttemperatures
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Pore Structural Features of Granite under Different Temperatures

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