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Pore structure evolution of organic-rich shale induced by structural deformation based on shale deformation experiments

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  • Cheng, Guoxi
  • Wu, Caifang
  • Jiang, Bo
  • Li, Fengli
  • Li, Ming
  • Song, Yu

Abstract

The effect of structural deformation on shale pore structure is a key scientific problem in the development of shale gas resources in structurally complex areas. In this study, we investigated the evolution rules and mechanisms of pore structures in organic-rich shale subjected to structural deformation of varying mechanisms and intensities, by conducting whole-aperture pore structure characterization on experimentally deformed shale rather than naturally deformed shale. Results showed that brittle deformed samples developed more mesopores, macropores, and fracture pores. The inter-granular pores between mineral fragments and the inter-layer pores and micro-fractures were the primary sources of the increased pore structures. The ductile deformation of shale promoted large-aperture transitional pores, mesopores, and small-aperture macropores but was adverse to small-aperture transitional pores, large-aperture macropores, and fracture pores. The primary contributors to the enhanced pore structures were inter-granular pores and inter-layer micro-fractures formed during crumpled deformation and inter-layer sliding of clay minerals, and inter-granular pores caused by the grinding, rounding, and rotation of mineral fragments under the flow deformation of the shale matrix. The irreversible compression of organic matter pores, mineral-related pores, and pre-existing large-aperture pores and fractures was the main reason for the reduction in small-aperture transitional pores, large-aperture macropores, and fracture pores.

Suggested Citation

  • Cheng, Guoxi & Wu, Caifang & Jiang, Bo & Li, Fengli & Li, Ming & Song, Yu, 2024. "Pore structure evolution of organic-rich shale induced by structural deformation based on shale deformation experiments," Energy, Elsevier, vol. 306(C).
    • Handle: RePEc:eee:energy:v:306:y:2024:i:c:s0360544224022370
    DOI: 10.1016/j.energy.2024.132463
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    References listed on IDEAS

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    1. Huang, Xianfu & Zhao, Ya-Pu, 2023. "Evolution of pore structure and adsorption-desorption in oil shale formation rocks after compression," Energy, Elsevier, vol. 278(PA).
    2. Gou, Qiyang & Xu, Shang & Hao, Fang & Yang, Feng & Shu, Zhiguo & Liu, Rui, 2021. "The effect of tectonic deformation and preservation condition on the shale pore structure using adsorption-based textural quantification and 3D image observation," Energy, Elsevier, vol. 219(C).
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