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<p>This study is dedicated to experimental investigation of transfer properties into salt rocks. A novel series of laboratory tests has been conducted, encompassing the characterization of liquid permeability, gas permeability and diffusion coefficient under hydrostatic stress conditions. Various levels of confining pressure and injection fluid pressure are considered, alongside an investigation of creep strains effects on the evolution of permeability. The new findings reveal that the permeability of tested salt rock samples diminishes markedly with an increase in confining pressure and this reduction is irreversible upon unloading. Additionally, the creep deformation experienced by the salt rock under hydrostatic stress significantly reduces the permeability. By characterizing the gas diffusion process using an equivalent diffusion-induced permeability, it is observed that the permeation is the predominant mechanism of transfer in salt rocks for the injection conditions of this study.</p>

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Experimental Study of Transfer Properties in Salt Rocks: Comparison of Diffusion and Permeability Transfers

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Nicolas Gay,
  • Matthieu Briffaut,
  • Laurent Jeannin,
  • Mejda Azabou,
  • Andrey Myagkiy,
  • Jianfu Shao

摘要

This study is dedicated to experimental investigation of transfer properties into salt rocks. A novel series of laboratory tests has been conducted, encompassing the characterization of liquid permeability, gas permeability and diffusion coefficient under hydrostatic stress conditions. Various levels of confining pressure and injection fluid pressure are considered, alongside an investigation of creep strains effects on the evolution of permeability. The new findings reveal that the permeability of tested salt rock samples diminishes markedly with an increase in confining pressure and this reduction is irreversible upon unloading. Additionally, the creep deformation experienced by the salt rock under hydrostatic stress significantly reduces the permeability. By characterizing the gas diffusion process using an equivalent diffusion-induced permeability, it is observed that the permeation is the predominant mechanism of transfer in salt rocks for the injection conditions of this study.