川东南地区五峰-龙马溪组深层超压富有机质页岩孔隙结构分形特征及其地质意义

刘若冰; 魏志红; 加奥启; 何生; 侯宇光; 何庆; 王涛; 曾宇; 杨锐

doi:10.3799/dqkx.2022.177

Volume 48 Issue 4

Apr. 2023

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Article Navigation > Earth Science > 2023 > 48(4): 1496-1516

Liu Ruobing, Wei Zhihong, Jia Aoqi, He Sheng, Hou Yuguang, He Qing, Wang Tao, Zeng Yu, Yang Rui, 2023. Fractal Characteristics of Pore Structure in Deep Overpressured Organic-Rich Shale in Wufeng-Longmaxi Formation in Southeast Sichuan and Its Geological Significance. Earth Science, 48(4): 1496-1516. doi: 10.3799/dqkx.2022.177

Citation:

Liu Ruobing, Wei Zhihong, Jia Aoqi, He Sheng, Hou Yuguang, He Qing, Wang Tao, Zeng Yu, Yang Rui, 2023. Fractal Characteristics of Pore Structure in Deep Overpressured Organic-Rich Shale in Wufeng-Longmaxi Formation in Southeast Sichuan and Its Geological Significance. Earth Science, 48(4): 1496-1516. doi: 10.3799/dqkx.2022.177

Citation:

Liu Ruobing, Wei Zhihong, Jia Aoqi, He Sheng, Hou Yuguang, He Qing, Wang Tao, Zeng Yu, Yang Rui, 2023. Fractal Characteristics of Pore Structure in Deep Overpressured Organic-Rich Shale in Wufeng-Longmaxi Formation in Southeast Sichuan and Its Geological Significance. Earth Science, 48(4): 1496-1516. doi: 10.3799/dqkx.2022.177

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Fractal Characteristics of Pore Structure in Deep Overpressured Organic-Rich Shale in Wufeng-Longmaxi Formation in Southeast Sichuan and Its Geological Significance

doi: 10.3799/dqkx.2022.177

Liu Ruobing^{1
,
,},
Wei Zhihong¹,
Jia Aoqi²,
He Sheng²,
Hou Yuguang²,
He Qing²,
Wang Tao²,
Zeng Yu²,
Yang Rui^{2
,
,
,}

1.
SINOPEC Exploration Branch Company, Chengdu 610041, China
2.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China

Received Date: 2022-01-19
Publish Date: 2023-04-25

Abstract

Abstract

To clarify the micropore structure and fractal characteristics of deep overpressured organic-rich shale in Wufeng and Longmaxi Formations in Southeast Sichuan basin, in this work it takes the organic-rich shales in Wufeng and Longmaxi Formations from four typical wells in the Dingshan and Dongxi areas as the research object. After ascertaining the mineralogical and geochemical characteristics of shale rocks, high-resolution scanning electron microscope, low-temperature gas (N₂, CO₂) adsorption, and mercury intrusion porosimetry experiments are used to qualitatively and quantitatively characterize the micropore structure of organic shale from the Wufeng and Longmaxi Formations. Based on gas (CO₂ and N₂) adsorption, mercury intrusion porosimetry and fractal theory, the fractal dimensions of pores in shale are calculated, and the internal relations between pore structure parameters, mineral composition, total organic carbon (TOC) content and fractal dimension of shale in different lithofacies are discussed. Results show that organic pores, inorganic pores (intergranular pores and intragranular pores) and microfractures are widely developed in these shale samples from Wufeng and Longmaxi Formations in the Dingshan and Dongxi areas. The pore morphology is dominated by wedge-shaped, slit-shaped or some parallel plate pores. The pore size distribution is multimodal. Mesoporeis the main contributor to the total pore volume (accounting for approximately 59%), and micropores are the minor contributor to the total pore volume (accounting for approximately 35%). The contribution of macropore to the total pore volume is relatively small. Influenced by the differences of rock composition, TOC content and diagenesis, the pores of different shale lithofacies show various evolution characteristics, resulting in strong heterogeneity and complex pore structure. The pores of the Wufeng-Longmaxi shale in the study area have obvious multi-scale fractal characteristics, and the pore fractal dimension characteristics between shale lithofacies at different scales are different, reflecting the extremely strong heterogeneous characteristics. Among them, the micropore fractal dimension D₁ and mesopore fractal dimension D₂ of siliceous shale are the largest, developing a more complex micropore and mesopore pore structure network, which can provide a large number of gas adsorption sites and storage space. In contrast, silicon-rich argillaceous shale has the largest macropore fractal dimension D₃, indicating that the macropore pore structure is relatively more complex, which can provide more pore space and facilitate the storage of free shale gas.
- Southeast Sichuan basin,
- Wufeng-Longmaxi Formation,
- deep overpressured organic-rich shale,
- microscopic pore structure,
- fractal dimension,
- mineralogy

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References(83)

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Fractal Characteristics of Pore Structure in Deep Overpressured Organic-Rich Shale in Wufeng-Longmaxi Formation in Southeast Sichuan and Its Geological Significance

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