川东南彭水地区五峰组-龙马溪组页岩孔隙结构及差异性

彭女佳; 何生; 郝芳; 何希鹏; 张培先; 翟刚毅; 包书景; 何陈诚; 杨锐

doi:10.3799/dqkx.2017.092

Volume 42 Issue 7

Jul. 2017

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Article Navigation > Earth Science > 2017 > 42(7): 1134-1146

Peng Nüjia, He Sheng, Hao Fang, He Xipeng, Zhang Peixian, Zhai Gangyi, Bao Shujing, He Chencheng, Yang Rui, 2017. The Pore Structure and Difference between Wufeng and Longmaxi Shales in Pengshui Area, Southeastern Sichuan. Earth Science, 42(7): 1134-1146. doi: 10.3799/dqkx.2017.092

Citation:

Peng Nüjia, He Sheng, Hao Fang, He Xipeng, Zhang Peixian, Zhai Gangyi, Bao Shujing, He Chencheng, Yang Rui, 2017. The Pore Structure and Difference between Wufeng and Longmaxi Shales in Pengshui Area, Southeastern Sichuan. Earth Science, 42(7): 1134-1146. doi: 10.3799/dqkx.2017.092

Citation:

Peng Nüjia, He Sheng, Hao Fang, He Xipeng, Zhang Peixian, Zhai Gangyi, Bao Shujing, He Chencheng, Yang Rui, 2017. The Pore Structure and Difference between Wufeng and Longmaxi Shales in Pengshui Area, Southeastern Sichuan. Earth Science, 42(7): 1134-1146. doi: 10.3799/dqkx.2017.092

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The Pore Structure and Difference between Wufeng and Longmaxi Shales in Pengshui Area, Southeastern Sichuan

doi: 10.3799/dqkx.2017.092

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
China University of Petroleum, Qingdao 266580, China
3.
Research Institute of Exploration and Development of East China Branch of SINOPEC, Nanjing 210011, China
4.
Oil & Gas Survey Center, China Geological Survey, Beijing 100029, China

Received Date: 2016-11-20
Publish Date: 2017-07-15

Abstract

Abstract

Pore structure and its difference is a basic issue in shale gas content and capacity evaluation. A number of studies have been made on the pore structure of the shale in the Wufeng Formation and Longmaxi Formation in Pengshui area, southeastern Sichuan. However, there is a lack of research on shale pore structure difference and organic pore quantitative characteristics. Using low-temperature and low-pressure N₂ adsorption and Ar ion milling field emission scanning electron microscopy (FE-SEM), for Wufeng and Longmaxi marine shales in Pengshui area of southeastern Sichuan, this paper investigated the pore structure of shale samples with the pore size ranging from 3nm to hundreds nm, and its difference between Wufeng and Longmaxi formations was also analyzed by observing and counting nano-pores in two-dimension, and computing fractal dimension. Results indicate that organic pores from Wufeng and Longmaxi shales in Pengshui area are very developed. Results of N₂ adsorption show the shale samples contain open cylindrical-like pores, layered slit-like pores and ink-bottle pores. And observation of scanning electron microscopy reveals organic pore morphology mainly is nearly circular, elliptic and polygon. The obvious difference of pore structure between Wufeng and Longmaxi shales is mainly reflected on the pore size, shape and quantity. N₂ adsorption results show that Wufeng shales have higher specific surface area and total pore volume than that of Longmaxi shales, and micropore within Wufeng shales accounts for higher proportion of total pore; pore size of Wufeng shales is narrower than that of Longmaxi shales. Observation and statistics of FE-SEM two-dimensional images indicate organic pores in Wufeng Formation are mainly pores with diameter less than 35nm and have irregular shapes. While Longmaxi organic pores are mainly less than 50nm in diameter and pore shapes mainly are nearly circular or elliptic. Based on the pore fractal dimension calculation of N₂ adsorption and FE-SEM, Wufeng Formation has higher pore fractal dimension values than Longmaxi Formation, which indicates that the pore structure of Wufeng shales is more complex than that of Longmaxi shales.
- pore structure,
- fractal features,
- Wufeng Formation,
- Longmaxi Formation,
- marine shale,
- Pengshui area,
- petroleum geology

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References(51)

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The Pore Structure and Difference between Wufeng and Longmaxi Shales in Pengshui Area, Southeastern Sichuan

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