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Nanopore structure and fractal characteristics of sandstone after high-temperature action

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Abstract

This paper examines sandstones of varying particle sizes within the coal-bearing strata in the Fugu area of northern Shaanxi. Employing high-temperature heat treatment, the study performs tests at different temperatures (25 ~ 600 ℃) on rock samples under both oxygen and nitrogen environments. Utilizing nitrogen adsorption tests combined with fractal dimension analysis, we investigate the pore structure and fractal characteristics of sandstones with varying particle sizes in coal-bearing formations. The results indicate that the total pore volume (aperture range 0.35 ~ 500nm), specific surface area, and average pore diameter of sandstone increase with temperature. Moreover, smaller particles result in more pronounced changes in the sandstone’s pore structure. At the same time, in comparison to the oxygen environment, sandstone treated in a nitrogen environment undergoes multiple occurrences of molecular layer nitrogen adsorption, leading to a higher degree of pore damage. In addition, the fractal dimension of sandstone pores decreases with rising temperature. Under high-temperature conditions, the pores undergo a transformation from the initial irregular crack structure to a homogenized pore structure. The weakening of non-uniformity contributes to the decrease in fractal dimension.

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Funding

National Natural Science Foundation of China 42372323.

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Authors and Affiliations

  1. School of Architecture and Civil Engineering, **’an University of Science and Technology, **’an, Shaanxi, 710054, China

    Beiru Jiang & Wanjun Ye

  2. Shaanxi Institute of Geological Survey, **’an, 710004, Shaanxi, China

    Yuyang Zhao

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  1. Beiru Jiang
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Author Contributions: Beiru Jiang: investigation, data curation, and writing-original draft preparation; Wanjun Ye: formal analysis and writing-review and editing; Yuyang Zhao: supervision, writing-review and editing. All authors read and approved the final manuscript.

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Correspondence to Beiru Jiang.

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Jiang, B., Ye, W. & Zhao, Y. Nanopore structure and fractal characteristics of sandstone after high-temperature action. Environ Earth Sci 83, 300 (2024). https://doi.org/10.1007/s12665-024-11612-3

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