Scale Effect of Coal Porosity and Permeability Characteristics Based on CT 3D Reconstruction from a Microperspective

Fan, Chaojun; Jiang, Xiaofeng; Fan, Nan; Xiao, Bin; Yang, Lei; Yang, Zhenhua

doi:10.1021/acs.energyfuels.3c04359

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…The main drilling targets for the Wufeng–Longmaxi formation shale include the Yucan 1 well, Wuxi 1 well, and Wuxi 2 well. Previous studies have conducted detailed analyses on the stratigraphic development, lithological characteristics, shale pore structure characteristics, and gas bearing properties of these wells. − However, research on the overall distribution and lithological characteristics of outcrops in the Wufeng–Longmaxi formations of the Qinling Orogenic Belt on the northern margin of the Sichuan Basin is relatively weak.…”

Section: Introductionmentioning

confidence: 99%

Elemental Geochemical Characteristics of Shales from Wufeng–Longmaxi Formations in the Southern Margin of the Qinling Orogenic Belt, China: Implications for Depositional Controls on Organic Matter

Xiao,

Guo,

Zhao

et al. 2024

ACS Omega

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The tectonic background and sedimentary environment during the transition period from the Ordovician to Silurian have been widely studied by many scholars. This study focuses on the Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation in the Bajiaokou profile at the southern margin of the Qinling Orogenic Belt in southern China. In order to study the aggregation mechanism of organic matter, geochemical proxies were proposed, including redox proxies (V, V/Al, U, U/Al, Mo, and Mo/Al), paleoproductivity proxies (P, P/Ti, Ba, Ba/Al, and Si XS ), paleoclimate proxies (CIA), and terrigenous flux proxies (Al, Zr, and Zr/Al). In addition, Al−Co[EF] × Mn[EF] is used to provide information on paleoenvironmental parameters such as watermass restriction conditions. The redox proxies show that the Wufeng−Longmaxi shale is mainly accumulated under oxic−dysoxic conditions. During the shale deposition period of Wufeng−Longmaxi formations, the marine surface primary productivity in the southern Qinling area is generally low to moderate. The paleoclimate proxies show that from the Late Ordovician to the Early Silurian the southern Qinling area generally had a warm and humid climate. The upwelling current is widely developed in the northern margin of the Sichuan Basin and the southern margin of the Qinling area. Although the upwelling current was highly developed during the deposition of the Wufeng Formation in the Bajiaokou profile, the concentrated accumulation of a large amount of volcanic ash resulted in the low primary productivity of the ocean. During the sedimentary period of the Longmaxi Formation in the Bajiaokou profile, the development of seasonal upwelling currents and a small amount of volcanic ash supply increased the primary productivity to moderate, which provided a good material basis for the enrichment of organic matter, but the high detritus flux and the water body condition of oxic−dysoxic resulted in the slight enrichment of organic matter.

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Section: Introductionmentioning

confidence: 99%

Elemental Geochemical Characteristics of Shales from Wufeng–Longmaxi Formations in the Southern Margin of the Qinling Orogenic Belt, China: Implications for Depositional Controls on Organic Matter

Xiao,

Guo,

Zhao

et al. 2024

ACS Omega

Self Cite

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Study on microscopic pores and permeability changes of coal frozen by liquid nitrogen based on CT scanning

Jia,

Huang,

Jia

2024

International Journal of Coal Preparation and Utilization

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Analysis and Characterization of Micro–Nano Pores in Coal Reservoirs of Different Coal Ranks

Song,

Yue,

Liu

2024

Applied Sciences

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Coalbed methane represents a promising source of clean and efficient unconventional energy. The intricate network of micro–nano pores within coal serves as the primary adsorption space for gas, contributing to the complexity of gas migration channels. In this study, based on the box-counting method, three coal samples representing low, medium, and high ranks were subjected to high-precision micro-CT scanning and nano-CT scanning to generate three-dimensional (3D) pore network models using Avizo visualization software. This facilitated the accurate and quantitative characterization of the micro–nano pore structures within coal reservoirs. The results indicated that the face rate distribution range of each sample was large, indicating relatively strong heterogeneity in each sample. The volume fractal dimension of each sample, determined through micro–nano-CT scanning, was around 2.5, while the surface fractal dimension exhibited oscillatory characteristics with moderate uniformity. The pore equivalent radius and throat equivalent radius distributions were unimodal across all the samples, with the micro-CT scanning revealing a concentration primarily within the range of 100–400 μm for the pore equivalent radius and within 200 μm for the throat equivalent radius. Conversely, the nano-CT scanning exhibited concentrations primarily within the range of 500–2500 nm for the pore equivalent radius and within 2000 nm for the throat equivalent radius. The analysis of the 3D reconstruction structures indicated that the middle-rank coal exhibited more developed large–medium pores compared with the low-rank and high-rank coal, while the low-rank and high-rank coal exhibited relatively more micro–small pores. Furthermore, the low-rank coal exhibited the fewest number of pores but the largest average pore equivalent radius and throat radius. Additionally, the middle–high-rank coal exhibited a relatively larger number of pores. Despite the complex topological structures observed in each sample, a significant proportion indicated a coordination number of 0–20, indicating excellent connectivity within the coal samples. This study is conducive to the optimization of coalbed methane surface development blocks and the formulation of reasonable development plans.

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Scale Effect of Coal Porosity and Permeability Characteristics Based on CT 3D Reconstruction from a Microperspective

Cited by 3 publications

References 41 publications

Elemental Geochemical Characteristics of Shales from Wufeng–Longmaxi Formations in the Southern Margin of the Qinling Orogenic Belt, China: Implications for Depositional Controls on Organic Matter

Elemental Geochemical Characteristics of Shales from Wufeng–Longmaxi Formations in the Southern Margin of the Qinling Orogenic Belt, China: Implications for Depositional Controls on Organic Matter

Study on microscopic pores and permeability changes of coal frozen by liquid nitrogen based on CT scanning

Analysis and Characterization of Micro–Nano Pores in Coal Reservoirs of Different Coal Ranks

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