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Study on the effect of fracture morphology on fracture deformation based on the thermal-hydraulic-chemical-deformation coupling model

Author

Listed:
  • Ji, Jiayan
  • Song, Xianzhi
  • Li, Shuang
  • Xu, Fuqiang
  • Song, Guofeng
  • Shi, Yu
  • Yi, Junlin

Abstract

The chemical reaction in the reservoir causes fracture deformation during the heat extraction of enhanced geothermal systems (EGS), affecting thermal performance. The reaction rate is sensitive to temperature, concentration, and reaction-specific surface area. While previous research mainly focuses on the influence of temperature and concentration on fracture deformation, conversely, the effect of fracture morphology(aperture and tortuosity) is ignored. In this study, the deformation characteristics of rough and flat fractures are compared, and the influences of aperture and tortuosity on fracture deformation are analyzed. According to the influence law, the fracture deformation relationship equation between the aperture deformation rate with tortuosity and aperture is fitted. Results show that the deformation of rough fracture is significantly higher than that of flat fracture, and the variations of fracture aperture increase with the aperture and tortuosity. Furthermore, the influence of tortuosity (the variation of aperture increased by 47.97% when the tortuosity increased from 1 to 1.5) is greater than the aperture (that increased by 4.8% when the aperture increased from 0.2 to 1). The rate of aperture change is a logarithmic function of tortuosity and a power function of the aperture. These results provide significant references for the study of EGS, subsurface karst et al.

Suggested Citation

  • Ji, Jiayan & Song, Xianzhi & Li, Shuang & Xu, Fuqiang & Song, Guofeng & Shi, Yu & Yi, Junlin, 2023. "Study on the effect of fracture morphology on fracture deformation based on the thermal-hydraulic-chemical-deformation coupling model," Energy, Elsevier, vol. 282(C).
    • Handle: RePEc:eee:energy:v:282:y:2023:i:c:s0360544223020224
    DOI: 10.1016/j.energy.2023.128628
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    References listed on IDEAS

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