Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China

This study is predominantly about the differences in shale pore structure and the controlling factors of shale gas content between Lower Silurian and Lower Cambrian from the upper Yangtze plate, which are of great significance to the occurrence mechanism of shale gas. The field emission scanning ele...

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Autores principales:	Xiaoyan Zou, Xianqing Li, Jizhen Zhang, Huantong Li, Man Guo, Pei Zhao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	shale gas pore structure gas content Lower Paleozoic shale upper Yangtze plate Technology T
Acceso en línea:	https://doaj.org/article/4fee9c4d2e504b22b130d3148efd7574
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spelling	oai:doaj.org-article:4fee9c4d2e504b22b130d3148efd75742021-11-25T17:27:06ZCharacteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China10.3390/en142276031996-1073https://doaj.org/article/4fee9c4d2e504b22b130d3148efd75742021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7603https://doaj.org/toc/1996-1073This study is predominantly about the differences in shale pore structure and the controlling factors of shale gas content between Lower Silurian and Lower Cambrian from the upper Yangtze plate, which are of great significance to the occurrence mechanism of shale gas. The field emission scanning electron microscopy combined with <i>Particles</i> (<i>Pores</i>) <i>and Cracks Analysis System</i> software, CO<sub>2</sub>/N<sub>2</sub> adsorption and the high-pressure mercury injection porosimetry, and methane adsorption were used to investigate characteristics of overall shale pore structure and organic matter pore, heterogeneity and gas content of the Lower Paleozoic in southern Sichuan Basin and northern Guizhou province from the upper Yangtze plate. Results show that porosity and the development of organic matter pores of the Lower Silurian are better than that of the Lower Cambrian, and there are four main types of pore, including interparticle pore, intraparticle pore, organic matter pore and micro-fracture. The micropores of the Lower Cambrian shale provide major pore volume and specific surface areas. In the Lower Silurian shale, there are mesopores besides micropores. Fractal dimensions representing pore structure complexity and heterogeneity gradually increase with the increase in pore volume and specific surface areas. There is a significant positive linear relationship between total organic carbon content and micropores volume and specific surface areas of the Lower Paleozoic shale, and the correlation of the Lower Silurian is more obvious than that of the Lower Cambrian. The plane porosity of organic matter increases with the increase in total organic carbon when it is less than 5%. The plane porosity of organic matter pores is positively correlated with clay minerals content and negatively correlated with brittle minerals content. The adsorption gas content of Lower Silurian and Lower Cambrian shale are 1.51–3.86 m<sup>3</sup>/t (average, 2.31 m<sup>3</sup>/t) and 0.35–2.38 m<sup>3</sup>/t (average, 1.36 m<sup>3</sup>/t). Total organic carbon, clay minerals and porosity are the main controlling factors for the differences in shale gas content between Lower Cambrian and Lower Silurian from the upper Yangtze plate. Probability entropy and organic matter plane porosity of the Lower Silurian are higher than those of Lower Cambrian shale, but form factor and roundness is smaller.Xiaoyan ZouXianqing LiJizhen ZhangHuantong LiMan GuoPei ZhaoMDPI AGarticleshale gaspore structuregas contentLower Paleozoic shaleupper Yangtze plateTechnologyTENEnergies, Vol 14, Iss 7603, p 7603 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	shale gas pore structure gas content Lower Paleozoic shale upper Yangtze plate Technology T
spellingShingle	shale gas pore structure gas content Lower Paleozoic shale upper Yangtze plate Technology T Xiaoyan Zou Xianqing Li Jizhen Zhang Huantong Li Man Guo Pei Zhao Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China
description	This study is predominantly about the differences in shale pore structure and the controlling factors of shale gas content between Lower Silurian and Lower Cambrian from the upper Yangtze plate, which are of great significance to the occurrence mechanism of shale gas. The field emission scanning electron microscopy combined with <i>Particles</i> (<i>Pores</i>) <i>and Cracks Analysis System</i> software, CO<sub>2</sub>/N<sub>2</sub> adsorption and the high-pressure mercury injection porosimetry, and methane adsorption were used to investigate characteristics of overall shale pore structure and organic matter pore, heterogeneity and gas content of the Lower Paleozoic in southern Sichuan Basin and northern Guizhou province from the upper Yangtze plate. Results show that porosity and the development of organic matter pores of the Lower Silurian are better than that of the Lower Cambrian, and there are four main types of pore, including interparticle pore, intraparticle pore, organic matter pore and micro-fracture. The micropores of the Lower Cambrian shale provide major pore volume and specific surface areas. In the Lower Silurian shale, there are mesopores besides micropores. Fractal dimensions representing pore structure complexity and heterogeneity gradually increase with the increase in pore volume and specific surface areas. There is a significant positive linear relationship between total organic carbon content and micropores volume and specific surface areas of the Lower Paleozoic shale, and the correlation of the Lower Silurian is more obvious than that of the Lower Cambrian. The plane porosity of organic matter increases with the increase in total organic carbon when it is less than 5%. The plane porosity of organic matter pores is positively correlated with clay minerals content and negatively correlated with brittle minerals content. The adsorption gas content of Lower Silurian and Lower Cambrian shale are 1.51–3.86 m<sup>3</sup>/t (average, 2.31 m<sup>3</sup>/t) and 0.35–2.38 m<sup>3</sup>/t (average, 1.36 m<sup>3</sup>/t). Total organic carbon, clay minerals and porosity are the main controlling factors for the differences in shale gas content between Lower Cambrian and Lower Silurian from the upper Yangtze plate. Probability entropy and organic matter plane porosity of the Lower Silurian are higher than those of Lower Cambrian shale, but form factor and roundness is smaller.
format	article
author	Xiaoyan Zou Xianqing Li Jizhen Zhang Huantong Li Man Guo Pei Zhao
author_facet	Xiaoyan Zou Xianqing Li Jizhen Zhang Huantong Li Man Guo Pei Zhao
author_sort	Xiaoyan Zou
title	Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China
title_short	Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China
title_full	Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China
title_fullStr	Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China
title_full_unstemmed	Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China
title_sort	characteristics of pore structure and gas content of the lower paleozoic shale from the upper yangtze plate, south china
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/4fee9c4d2e504b22b130d3148efd7574
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Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China

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