Quantitative characterization of pore connectivity using NMR and MIP: A case study of the Wangyinpu and Guanyintang shales in the Xiuwu basin, Southern China

doi:10.1016/j.coal.2018.07.007

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	Quantitative characterization of pore connectivity using NMR and MIP: A case study of the Wangyinpu and Guanyintang shales in the Xiuwu basin, Southern China
	Gao, Fenglin 1,2,3; Song, Yan 1,2,4; Li, Zhuo 1,2; Xiong, Fengyang 5; Chen, Lei 1,2,3; Zhang, Xinxin 6; Chen, Zhiyuan 1,2,3; Moortgat, Joachim 5
刊名	INTERNATIONAL JOURNAL OF COAL GEOLOGY
	2018-09-01
卷号	197 页码:53-65
关键词	Wangyinpu and Guanyintang shales Pore size distribution Pore connectivity Stratification Pore morphology
ISSN号	0166-5162
DOI	10.1016/j.coal.2018.07.007
英文摘要	Pore connectivity is one of the most important characteristics of shale reservoirs because it significantly impacts the effective pore space, the fluid migration, and the gas production. In this work, pore connectivity and its primary controlling factors were investigated using a combination of field emission-scanning electron microscopy (FE-SEM), focused ion beam-scanning electron microscopy (FIB-SEM), mercury intrusion porosimetry (MIP), and nuclear magnetic resonance (NMR). The results show that using the difference between NMR and MIP is a reliable method to characterize pore connectivity. NMR pore size distribution (PSD) curves converted from 12 spectra, and MIP PSD curves were observed to have consistent shapes. The amplitude of NMR PSD curves is higher than that of MIP PSD curves for S-group pores ( < 200 nm), while the relationship is opposite for L-group pores (200 nm-10 pm), which may be due to the permeability of shale. A low permeability allows a smaller amount of mercury to intrude into the small pores. Based on experimental results, the pores of 8-20 nm make a contribution of 5%-11% to pore connectivity, whereas the pores of 200-700 nm are mainly interparticle pores and microfissures, contributing from 38% to 72% of pore connectivity. Stratification and pore morphology in the Lower Cambrian Wangyinpu and Guanyintang shales in the Xiuwu Basin are the two critical influencing factors of pore connectivity. The pore connectivity of well-laminated shale is higher than that of less-laminated shale. The laminated structures are usually composed of argillaceous and siliceous lamina, which tend to give rise to fissures during hydrocarbon generation or under confining stress. As a result, the pores around the microfissures are more likely to be communicating. Shales with the structure of uniformly distributed organic and inorganic minerals have the best pore connectivity. Both the interparticle pores and microfissures between organic matter and inorganic minerals or between inorganic minerals can effectively connect organic pore networks and greatly improve the pore connectivity.
资助项目	National Science and Technology Major Project[2016ZX05034001-005]
WOS关键词	NUCLEAR-MAGNETIC-RESONANCE ; MERCURY INTRUSION POROSIMETRY ; GAS-STORAGE CAPACITY ; LOW-FIELD NMR ; ORDOS BASIN ; ORGANIC-MATTER ; BARNETT SHALE ; ELECTRON-MICROSCOPY ; SIZE DISTRIBUTIONS ; SPACE MORPHOLOGY
WOS研究方向	Energy & Fuels ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000447475800005
资助机构	National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89206]
专题	地质与地球物理研究所_其他部门
通讯作者	Song, Yan
作者单位	1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China 2.China Univ Petr, Unconvent Nat Gas Inst, Beijing 102249, Peoples R China 3.China Univ Petr, Unconvent Oil & Gas Cooperat Innovat Ctr, Beijing 102249, Peoples R China 4.Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 5.Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Gao, Fenglin,Song, Yan,Li, Zhuo,et al. Quantitative characterization of pore connectivity using NMR and MIP: A case study of the Wangyinpu and Guanyintang shales in the Xiuwu basin, Southern China[J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY,2018,197:53-65.
APA	Gao, Fenglin.,Song, Yan.,Li, Zhuo.,Xiong, Fengyang.,Chen, Lei.,...&Moortgat, Joachim.(2018).Quantitative characterization of pore connectivity using NMR and MIP: A case study of the Wangyinpu and Guanyintang shales in the Xiuwu basin, Southern China.INTERNATIONAL JOURNAL OF COAL GEOLOGY,197,53-65.
MLA	Gao, Fenglin,et al."Quantitative characterization of pore connectivity using NMR and MIP: A case study of the Wangyinpu and Guanyintang shales in the Xiuwu basin, Southern China".INTERNATIONAL JOURNAL OF COAL GEOLOGY 197(2018):53-65.