$Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin$
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Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin

A few limestone layers usually underlie and/or overlie the shale layers/sections in marine facies, especially in marine–continental transitional facies (MCTF). The role of limestones in the natural hydraulic fracturing of shale sections will help in selecting the fracturing location, improving the s...

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Autores principales:	Zhipeng Huo, Jianbo Gao, Jinchuan Zhang, Dong Zhang, Yutao Liang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Limestone Shale section Natural fracture Mechanical parameter Fracturing barrier Southern North China Basin Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/66ccaa7b963c463d837b86ef4b6185c8
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spelling	oai:doaj.org-article:66ccaa7b963c463d837b86ef4b6185c82021-11-28T04:34:25ZRole of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin2352-484710.1016/j.egyr.2021.11.025https://doaj.org/article/66ccaa7b963c463d837b86ef4b6185c82021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721011628https://doaj.org/toc/2352-4847A few limestone layers usually underlie and/or overlie the shale layers/sections in marine facies, especially in marine–continental transitional facies (MCTF). The role of limestones in the natural hydraulic fracturing of shale sections will help in selecting the fracturing location, improving the stimulation power, and clarifying fracture propagation law to product more shale oil and gas. Taking an MCTF in the Southern North China Basin as an example, the differences in natural fractures and mechanical properties between limestones and shales were compared to examine the role of limestone in hydraulic fracturing. Our analyses show that shales developed more non-tectonic fractures than limestones, usually interconnected with tectonic fractures to form a fracture network. Limestones generally have a higher Young’s modulus, compressive strength, in situ stress, and fracturing pressure and a more difficult fracture initiation than shales and sandstones. Overlying and underlying limestones with less fractures and higher mechanical properties can act as an effective barrier bed, which prevents induced fractures originating from the shale sections from penetrating their mechanical interfaces into the adjacent limestone sections. This action maintains a high stimulation power in the shale sections to form a complicated induced fracture network.Zhipeng HuoJianbo GaoJinchuan ZhangDong ZhangYutao LiangElsevierarticleLimestoneShale sectionNatural fractureMechanical parameterFracturing barrierSouthern North China BasinElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 8711-8729 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Limestone Shale section Natural fracture Mechanical parameter Fracturing barrier Southern North China Basin Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Limestone Shale section Natural fracture Mechanical parameter Fracturing barrier Southern North China Basin Electrical engineering. Electronics. Nuclear engineering TK1-9971 Zhipeng Huo Jianbo Gao Jinchuan Zhang Dong Zhang Yutao Liang Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin
description	A few limestone layers usually underlie and/or overlie the shale layers/sections in marine facies, especially in marine–continental transitional facies (MCTF). The role of limestones in the natural hydraulic fracturing of shale sections will help in selecting the fracturing location, improving the stimulation power, and clarifying fracture propagation law to product more shale oil and gas. Taking an MCTF in the Southern North China Basin as an example, the differences in natural fractures and mechanical properties between limestones and shales were compared to examine the role of limestone in hydraulic fracturing. Our analyses show that shales developed more non-tectonic fractures than limestones, usually interconnected with tectonic fractures to form a fracture network. Limestones generally have a higher Young’s modulus, compressive strength, in situ stress, and fracturing pressure and a more difficult fracture initiation than shales and sandstones. Overlying and underlying limestones with less fractures and higher mechanical properties can act as an effective barrier bed, which prevents induced fractures originating from the shale sections from penetrating their mechanical interfaces into the adjacent limestone sections. This action maintains a high stimulation power in the shale sections to form a complicated induced fracture network.
format	article
author	Zhipeng Huo Jianbo Gao Jinchuan Zhang Dong Zhang Yutao Liang
author_facet	Zhipeng Huo Jianbo Gao Jinchuan Zhang Dong Zhang Yutao Liang
author_sort	Zhipeng Huo
title	Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin
title_short	Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin
title_full	Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin
title_fullStr	Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin
title_full_unstemmed	Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin
title_sort	role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: the case of marine–continental transitional facies in the southern north china basin
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/66ccaa7b963c463d837b86ef4b6185c8
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Role of overlying and underlying limestones in the natural hydraulic fracturing of shale sections: The case of marine–continental transitional facies in the Southern North China Basin

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