基于Ar-SEM及PCAS页岩孔隙结构定量表征

闫高原; 韦重韬; 宋昱; 张军建; 杨浩

doi:10.3799/dqkx.2017.525

Volume 43 Issue 5

May 2018

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Yan Gaoyuan, Wei Chongtao, Song Yu, Zhang Junjian, Yang Hao, 2018. Quantitative Characterization of Shale Pore Structure Based on Ar-SEM and PCAS. Earth Science, 43(5): 1602-1610. doi: 10.3799/dqkx.2017.525

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Yan Gaoyuan, Wei Chongtao, Song Yu, Zhang Junjian, Yang Hao, 2018. Quantitative Characterization of Shale Pore Structure Based on Ar-SEM and PCAS. Earth Science, 43(5): 1602-1610. doi: 10.3799/dqkx.2017.525

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Quantitative Characterization of Shale Pore Structure Based on Ar-SEM and PCAS

doi: 10.3799/dqkx.2017.525

Yan Gaoyuan^{1,2
,},
Wei Chongtao^{1,2
,
,},
Song Yu^1,2,
Zhang Junjian^1,2,
Yang Hao^1,2

1.
School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China
2.
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China

Received Date: 2017-09-21
Publish Date: 2018-05-15

Abstract

Abstract

Shale pore characteristics are important part of shale reservoir research. Based on the shale samples from Taiyuan Formation and Shanxi Formation in the S-1 well of Qinshui basin, the morphology of the pores was analyzed by argon ion polishing scanning electron microscope (Ar-SEM), and the pores of the Ar-SEM micrographs were quantitatively characterized by pores and cracks analysis system (PCAS). The results show that the pore types of the samples are mainly organic matter pores, intergranular pores, and intragranular pores. The pore sizes are mostly less than 100 nm, accounting for 72.70%-82.13%, and the mesopore ratios are 39.76%-45.48%, which is favorable for pore connectivity and gas migration. The pore structure becomes increasingly more complex with the increase of depth; but the deeper the layer, the more slowly the structural complexity increases with the increase of pore area.There is an inflection point in the vicinity of R_{o, max}=2 for the pore structure complexity. In the high maturity stage, the complexity of the pore structure gets increasingly lower with the increase of the maturity, and the structure complexity is lower as the pore area is larger; in the over mature stage, pore structure is increasingly more complex with the increase of maturity, and the larger the pore area, the greater the structural complexity.
- Qinshui basin,
- Carboniferous-Permian,
- pore structure characteristics,
- form factor,
- fractal dimension,
- probability entropy,
- resource geology

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References(48)

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Quantitative Characterization of Shale Pore Structure Based on Ar-SEM and PCAS

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