Characteristics of pore structures from the Lower Paleozoic shale gas reservoirs in northern Guizhou, South China

Li, Xianqing; Li, Yangyang; Li, Jiehao; Zou, Xiaoyan; Guo, Man; Wang, Zhe; Zhang, Xueqing; Wang, Feiyu

doi:10.1016/j.jnggs.2020.07.003

Cited by 7 publications

(8 citation statements)

References 26 publications

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“…R o is greater than 2% in an overmature stage, and the brittle mineral content is high. Through isothermal adsorption tests and previous research results [36,38], the total gas content of Lower Silurian shale in the upper Yangtze region is significantly higher than that of Lower Cambrian shale. As shown in Figure 20, TOC, clay minerals and porosity are the main controlling factors for the difference in shale gas content between Lower Silurian and Lower Cambrian from the upper Yangtze plate.…”

Section: Controlling Factors Of Shale Gas Contentmentioning

confidence: 68%

“…Ro is greater than 2% in an over-mature stage, and the brittle mineral content is high. Through isothermal adsorption tests and previous research results [36,38], the total gas content of Lower Silurian shale in the upper Yangtze region is significantly higher than that of Lower Cambrian The TOC of the whole shale reservoir in the Lower Paleozoic of the upper Yangtze plate is large, with an average value of more than 2%. R o is greater than 2% in an overmature stage, and the brittle mineral content is high.…”

Section: Controlling Factors Of Shale Gas Contentmentioning

confidence: 71%

“…Total organic carbon (TOC), R o and mineral content are important factors affecting the shale pore structure characteristics of Qiongzhusi Fm in southern Sichuan Basin [34]. Compared with the Niutitang Fm in northern Guizhou province, the shale porosity and permeability of Longmaxi Fm in this area is higher, and the pore system is relatively developed, which is conducive to the adsorption and migration of shale gas [35,36]. TOC, quartz content and macropores developed by clay mineral particles are positively correlated with porosity.…”

Section: Introductionmentioning

confidence: 99%

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

Zou

et al. 2021

Energies

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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 Particles (Pores) and Cracks Analysis System software, CO2/N2 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 m3/t (average, 2.31 m3/t) and 0.35–2.38 m3/t (average, 1.36 m3/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.

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Section: Controlling Factors Of Shale Gas Contentmentioning

confidence: 68%

Section: Controlling Factors Of Shale Gas Contentmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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

Zou

et al. 2021

Energies

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“…As a result, technological breakthroughs have been made in two sets of shale formations: the Lower Cambrian Qiongzhusi Formation and the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation in the southern marine basin (Huang et al 2012;Nie et al 2016Nie et al , 2017Zeng et al 2020;Qiu et al 2021;Li et al 2022). For this reason, four national-level shale gas development and experimental zones have been successively established in Fuling, Zhaotong, Changning and Weiyuan (Li et al 2009;Ma et al 2018;Cui et al 2019), forming a large-scale development capacity of shale gas with shallow marine facies of 3500 m.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Multiscale Conductivity Mechanism of Marine Shales from Wufeng–Longmaxi Formation in the Southern Sichuan Basin of China

et al. 2023

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“…Some scholars used INCA software on OXFORD spectrometer to establish a synthetic energy spectrum database and retrieval system for minerals and used it to identify minerals [39]. Such methods have already realized quantitative identification of rare earth minerals which conventional identification methods are difficult to accomplish, yet problems such as high measurement cost and difficulty in application and promotion still exist [40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

A New Quantitative Approach for Element-Mineral Determination Based on “EDS (Energy Dispersive Spectroscopy) Method”

2021

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With the continuous development of hydrocarbon exploration, how to efficiently, economically, accurately, and comprehensively obtain mineral species, composition, and structure and diagenesis information has become one of the hot topics in both the academia and industry. By scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), a new method of qualitative mineral identification and quantitative measurement is established. Typical tight sandstone reservoir rock samples in the Ordos Basin are selected; through the element surface scanning image of “mineral element composition” and “pixel element combination”, mineral types are distinguished, and mineral parameters such as types, characteristics, and content are rapidly and accurately determined. Meanwhile, such results achieved via the new method are compared with conventional XRD and TIMA methods. The results show that the new method exhibits several advantages: cost advantages compared to XRD experiment analysis technology and TIMA system and ability to analyze low content minerals which XRD techniques are hard to identify; it allows quantitative characterization on the phenomenon of mineral miscibility, which is of great significance to explore the mineral diagenetic evolution.

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Characteristics of pore structures from the Lower Paleozoic shale gas reservoirs in northern Guizhou, South China

Cited by 7 publications

References 26 publications

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

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

Insights into the Multiscale Conductivity Mechanism of Marine Shales from Wufeng–Longmaxi Formation in the Southern Sichuan Basin of China

A New Quantitative Approach for Element-Mineral Determination Based on “EDS (Energy Dispersive Spectroscopy) Method”

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