Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin

The complex pore throat characteristics are significant factors that control the properties of tight sandstone reservoirs. Due to the strong heterogeneity of the pore structure in tight reservoirs, it is difficult to characterize the pore structure by single methods. To determine the pore throat, co...

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Autores principales:	Wang Youzhi, Mao Cui, Li Qiang, Jin Wei, Zhu Simiao, Wang Xiandong, Wang Zhiguo, He Jiayin, Shen Jiagang, Zhu Yanping, Wang Ying, Wang Haiyan, Tan Baode, Ren Junhu
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	storage space pore throat structure pore throat tight sandstone yingshan oilfield Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/645a062d220a4a6eb3ba2d23bab2ce9c
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spelling	oai:doaj.org-article:645a062d220a4a6eb3ba2d23bab2ce9c2021-12-05T14:10:49ZPore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin2391-544710.1515/geo-2020-0273https://doaj.org/article/645a062d220a4a6eb3ba2d23bab2ce9c2021-10-01T00:00:00Zhttps://doi.org/10.1515/geo-2020-0273https://doaj.org/toc/2391-5447The complex pore throat characteristics are significant factors that control the properties of tight sandstone reservoirs. Due to the strong heterogeneity of the pore structure in tight reservoirs, it is difficult to characterize the pore structure by single methods. To determine the pore throat, core, casting thin sections, micrographs from scanning electron microscopy, rate-controlled mercury injection, and high-pressure mercury injection were performed in member 2 of Xujiahe Formation of Yingshan gasfield, Sichuan, China. The pore throat characteristics were quantitatively characterized, and the distribution of pore throat at different scales and its controlling effect on reservoir physical properties were discussed. The results show that there are mainly residual intergranular pores, intergranular dissolved pores, ingranular dissolved pores, intergranular pores, and micro-fractures in the second member of the Xujiahe Formation tight sandstone reservoir. The distribution range of pore throat is 0.018–10 μm, and the radius of pore throat is less than 1 μm. The ranges of pore radius were between 100 and 200 μm, the peak value ranges from 160 to 180 μm, and the pore throat radius ranges from 0.1 to 0.6 μm. With the increase of permeability, the distribution range of throat radius becomes wider, and the single peak throat radius becomes larger, showing the characteristic of right skew. The large throat of the sandy conglomerate reservoir has an obvious control effect on permeability, but little influence on porosity. The contribution rate of nano-sized pore throat to permeability is small, ranging from 3.29 to 34.67%. The contribution rate of porosity was 48.86–94.28%. Therefore, pore throat characteristics are used to select high-quality reservoirs, which can guide oil and gas exploration and development of tight sandstone reservoirs.Wang YouzhiMao CuiLi QiangJin WeiZhu SimiaoWang XiandongWang ZhiguoHe JiayinShen JiagangZhu YanpingWang YingWang HaiyanTan BaodeRen JunhuDe Gruyterarticlestorage spacepore throat structurepore throattight sandstoneyingshan oilfieldGeologyQE1-996.5ENOpen Geosciences, Vol 13, Iss 1, Pp 1174-1186 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	storage space pore throat structure pore throat tight sandstone yingshan oilfield Geology QE1-996.5
spellingShingle	storage space pore throat structure pore throat tight sandstone yingshan oilfield Geology QE1-996.5 Wang Youzhi Mao Cui Li Qiang Jin Wei Zhu Simiao Wang Xiandong Wang Zhiguo He Jiayin Shen Jiagang Zhu Yanping Wang Ying Wang Haiyan Tan Baode Ren Junhu Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin
description	The complex pore throat characteristics are significant factors that control the properties of tight sandstone reservoirs. Due to the strong heterogeneity of the pore structure in tight reservoirs, it is difficult to characterize the pore structure by single methods. To determine the pore throat, core, casting thin sections, micrographs from scanning electron microscopy, rate-controlled mercury injection, and high-pressure mercury injection were performed in member 2 of Xujiahe Formation of Yingshan gasfield, Sichuan, China. The pore throat characteristics were quantitatively characterized, and the distribution of pore throat at different scales and its controlling effect on reservoir physical properties were discussed. The results show that there are mainly residual intergranular pores, intergranular dissolved pores, ingranular dissolved pores, intergranular pores, and micro-fractures in the second member of the Xujiahe Formation tight sandstone reservoir. The distribution range of pore throat is 0.018–10 μm, and the radius of pore throat is less than 1 μm. The ranges of pore radius were between 100 and 200 μm, the peak value ranges from 160 to 180 μm, and the pore throat radius ranges from 0.1 to 0.6 μm. With the increase of permeability, the distribution range of throat radius becomes wider, and the single peak throat radius becomes larger, showing the characteristic of right skew. The large throat of the sandy conglomerate reservoir has an obvious control effect on permeability, but little influence on porosity. The contribution rate of nano-sized pore throat to permeability is small, ranging from 3.29 to 34.67%. The contribution rate of porosity was 48.86–94.28%. Therefore, pore throat characteristics are used to select high-quality reservoirs, which can guide oil and gas exploration and development of tight sandstone reservoirs.
format	article
author	Wang Youzhi Mao Cui Li Qiang Jin Wei Zhu Simiao Wang Xiandong Wang Zhiguo He Jiayin Shen Jiagang Zhu Yanping Wang Ying Wang Haiyan Tan Baode Ren Junhu
author_facet	Wang Youzhi Mao Cui Li Qiang Jin Wei Zhu Simiao Wang Xiandong Wang Zhiguo He Jiayin Shen Jiagang Zhu Yanping Wang Ying Wang Haiyan Tan Baode Ren Junhu
author_sort	Wang Youzhi
title	Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin
title_short	Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin
title_full	Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin
title_fullStr	Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin
title_full_unstemmed	Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin
title_sort	pore throat characteristics of tight reservoirs by a combined mercury method: a case study of the member 2 of xujiahe formation in yingshan gasfield, north sichuan basin
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/645a062d220a4a6eb3ba2d23bab2ce9c
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Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin

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