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Pore Evolution of Oil Shale during Sub-Critical Water Extraction

Author

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  • Youhong Sun

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun 130021, China)

  • Li He

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun 130021, China)

  • Shijie Kang

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun 130021, China)

  • Wei Guo

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun 130021, China)

  • Qiang Li

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun 130021, China)

  • Sunhua Deng

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun 130021, China)

Abstract

The porous structure of oil shale plays a vital role in heat transfer and mass transport. In this study, the pore evolution of oil shale samples during sub-critical water extraction was investigated by scanning electron microscope (SEM), N 2 adsorption/desorption, and low field nuclear magnetic resonance (NMR). The following results were obtained: (1) With increased extraction time and extraction temperature, the yield of bitumen increased, pores in spent samples obviously developed and extended to the inner of the shale matrix, and their pore size gradually increased from the nano to micron size; (2) Pore volume and surface area of mesopores increased with increasing yield, indicating that the extraction of organic matter improves the development of organic matter pores distributed in mesopores; (3) The formation of secondary organic matter pores primarily contributes to the increment of pore volume in oil shale samples. The diameter of kerogen may range from 100 to 1600 nm; (4) Fractures probably propagated parallel to the bedding direction, and their evolution led to an initial increase in the total pore volume followed by a decrease. This is likely because fractures will be strongly compacted by pressure due to the weakening of inner support after more organic matter is extracted.

Suggested Citation

  • Youhong Sun & Li He & Shijie Kang & Wei Guo & Qiang Li & Sunhua Deng, 2018. "Pore Evolution of Oil Shale during Sub-Critical Water Extraction," Energies, MDPI, vol. 11(4), pages 1-15, April.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:842-:d:139564
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    References listed on IDEAS

    as
    1. Gang Wang & Yue Wang & Lulu Sun & Xiang Song & Qiqi Liu & Hao Xu & Wenzhou Du, 2018. "Study on the Low-Temperature Oxidation Law in the Co-Mining Face of Coal and Oil Shale in a Goaf—A Case Study in the Liangjia Coal Mine, China," Energies, MDPI, vol. 11(1), pages 1-16, January.
    2. Shuai Li & Jun Tang & Yunhong Ding & Shimin Liu & Guangfeng Liu & Bo Cai, 2017. "Recovery of Low Permeability Reservoirs Considering Well Shut-Ins and Surfactant Additivities," Energies, MDPI, vol. 10(9), pages 1-14, August.
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    Cited by:

    1. Lei Wang & Dong Yang & Xiang Li & Jing Zhao & Guoying Wang & Yangsheng Zhao, 2018. "Macro and Meso Characteristics of In-Situ Oil Shale Pyrolysis Using Superheated Steam," Energies, MDPI, vol. 11(9), pages 1-15, August.

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