The Influence of Lamina Density and Occurrence on the Permeability of Lamellar Shale after Hydration

The characteristics of laminae in lamellar shale oil reservoirs have important influences on reservoir parameters, especially permeability. In order to explore the influence of lamina density and occurrence on the permeability of lamellar shale after hydration, we studied the lamellar shale in the C...

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Bibliographic Details
Published in:Crystals (Basel) 2021-12, Vol.11 (12), p.1524
Main Authors: Zhao, Pengfei, Wang, Xingxing, Fan, Xiangyu, Wang, Xingzhi, Zeng, Feitao, Zhang, Mingming, Meng, Fan, Nie, Wen
Format: Article
Language:English
Subjects:
Anisotropy
Density
Experiments
Hydration
lamellar shale
Lamellar structure
Laminates
Microfracture
Oil shale
Ordos Basin
Permeability
Reservoirs
Shale oil
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Summary:The characteristics of laminae in lamellar shale oil reservoirs have important influences on reservoir parameters, especially permeability. In order to explore the influence of lamina density and occurrence on the permeability of lamellar shale after hydration, we studied the lamellar shale in the Chang 7 member of the Yanchang Formation of Triassic in Ordos Basin. By comparing the permeability of bedding shale and lamellar shale with different densities of laminae, it was found that the permeability anisotropy of lamellar shale was stronger. In the direction parallel to the lamina, the permeability increased approximately linearly with an increase in lamina density. The effect of hydration on rock micropore structure and permeability was studied by soaking shale in different fluids. Most of the microfracture in the lamellar shale was parallel to the lamina direction, and hydration led to a widening of the microfracture, which led to the most obvious increase in permeability parallel to the lamina. Collectively, the research results proved that lamina density, occurrence, and hydration have a significant influence on the permeability anisotropy of lamellar shale.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11121524