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Comprehensive preparation and multiscale characterization of kerogen in oil shale

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  • Zhan, Honglei
  • Yang, Qi
  • Qin, Fankai
  • Meng, Zhaohui
  • Chen, Ru
  • Miao, Xinyang
  • Zhao, Kun
  • Yue, Wenzheng

Abstract

Despite the importance of kerogen as the organic backbone of hydrocarbon production from source rocks such as oil shale, properties of kerogen at both the atomic and micron scales remain unexplored under non-destructive conditions. As the demand for the utilization of kerogen in oil shale rises, identifying its atomic anisotropy and three-dimensional (3D) distribution in oil shale becomes even more important. In this study, using a hybrid preparation-analysis method, we propose a panel of physical preparation methods, including mechanical stripping and polishing thinning, and characterization techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), terahertz time-domain spectroscopy (THz-TDS), and oblique incidence reflectance difference (OIRD) analysis without considering pyrolysis and the chemical separation of kerogen. We investigated kerogen's anisotropy at the atomic scale and its 3D distribution as flocculants and strips and developed a new OIRD computed tomography (CT) method (OIRD-CT) amenable to experimental validation, including SEM and THz scanning. Thus, the multiscale properties of kerogen detected using the combination of physical preparation and advanced characterization techniques, especially OIRD-CT, are helpful in improving our understanding of the precise utilization of oil shale.

Suggested Citation

  • Zhan, Honglei & Yang, Qi & Qin, Fankai & Meng, Zhaohui & Chen, Ru & Miao, Xinyang & Zhao, Kun & Yue, Wenzheng, 2022. "Comprehensive preparation and multiscale characterization of kerogen in oil shale," Energy, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:energy:v:252:y:2022:i:c:s0360544222009082
    DOI: 10.1016/j.energy.2022.124005
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    References listed on IDEAS

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    1. Jing Yang & Javin Hatcherian & Paul C. Hackley & Andrew E. Pomerantz, 2017. "Nanoscale geochemical and geomechanical characterization of organic matter in shale," Nature Communications, Nature, vol. 8(1), pages 1-9, December.
    2. Zhan, Honglei & Wang, Yan & Chen, Mengxi & Chen, Ru & Zhao, Kun & Yue, Wenzheng, 2020. "An optical mechanism for detecting the whole pyrolysis process of oil shale," Energy, Elsevier, vol. 190(C).
    3. Wang, Guoying & Liu, Shaowei & Yang, Dong & Fu, Mengxiong, 2022. "Numerical study on the in-situ pyrolysis process of steeply dipping oil shale deposits by injecting superheated water steam: A case study on Jimsar oil shale in Xinjiang, China," Energy, Elsevier, vol. 239(PC).
    4. Zhan, Honglei & Qin, Fankai & Chen, Sitong & Chen, Ru & Meng, Zhaohui & Miao, Xinyang & Zhao, Kun, 2022. "Two-step pyrolysis degradation mechanism of oil shale through comprehensive analysis of pyrolysis semi-cokes and pyrolytic gases," Energy, Elsevier, vol. 241(C).
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    Cited by:

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    3. Huang, Xudong & Kang, Zhiqin & Zhao, Jing & Wang, Guoying & Zhang, Hongge & Yang, Dong, 2023. "Experimental investigation on micro-fracture evolution and fracture permeability of oil shale heated by water vapor," Energy, Elsevier, vol. 277(C).

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