This study explores the changes in the microstructural characteristics of rocks within underground natural gas storage facilities and their impact on permeability. Laboratory simulations of natural gas storage conditions were conducted using representative rock samples from the coastal area of Tianjin, China. The microstructures of the rocks before and after gas storage were analyzed and compared using Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The findings reveal that high pressure and chemical reactions under storage conditions lead to significant changes in the mineral composition and crystal structure of the rocks, which directly affect their permeability. Quantitative analyses of porosity and fracture density further confirmed changes in permeability. Additionally, this research developed a statistical model that clearly defines the quantitative relationship between microstructural parameters and permeability, providing a scientific basis for the design and risk management of natural gas storage facilities.

Fan Wu, Xiaoji Wang, Qichen Liang. Study on microstructure change of underground gas storage facilities and its influence on permeability. International Journal of Frontiers in Engineering Technology (2024), Vol. 6, Issue 3: 117-125. https://doi.org/10.25236/IJFET.2024.060315.

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