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Study on the microscopic pore permeability behavior of granite under multiple cycles of cold-hot alternating damage effects

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Abstract

In the process of harnessing geothermal energy, the enduring effects of thermal cycling on granite within the geothermal reservoir led to alterations in rock permeability. This, in turn, directly impacts the efficiency of thermal energy extraction. Hence, delving into the micro-permeability dynamics of granite is imperative to understand the characteristics of prevalent fractures. Employing micro-CT technology, we meticulously extract and analyze the pores of granite samples, unveiling the distribution patterns of pores and micro-permeability variations under successive thermal cycles. The resultant three-dimensional pore model vividly showcases the evolving pore structures during both heating and cooling cycles. Notably, the distribution curve of granite pore volume adheres to a chi-square distribution. Through the utilization of pore volume distribution curves, we categorize rock pores into four distinct types: micropores, mesopores, macropores, and fractures. Both quantitatively and visually, micropores and mesopores predominate, while a fraction of pores gradually transitions into sizable fractures. By employing suitable representative elements to construct the flow field within the large pore model and subsequently calculating permeability, we observe a positive correlation between porosity, permeability, and cyclic temperature-induced damage. Notably, the estimated permeability closely aligns with the measured values, exhibiting an acceptable margin of error. Furthermore, under the influence of thermal cycle-induced damage, the flow simulation demonstrates a noticeable increase in the number of flow lines, consequently resulting in enhanced permeability. This effectively validates the accuracy of the flow simulation based on micro-CT results.

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Data availability

Data supporting the findings are available from the authors upon request.

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Acknowledgments

Thanks to the laboratory staff of Hebei University. Support was provided by the College of Civil Engineering and Architecture, Hebei University, Baoding 071002.

Funding

Funding was provided by the Hebei Natural Science Foundation (E2023201024).

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Li Yu and Haonan Li wrote the main manuscript text and prepared all figures. All authors participated in the experiment and reviewed the manuscript.

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Correspondence to Haonan Li.

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Yu, L., Li, H., Wu, Y. et al. Study on the microscopic pore permeability behavior of granite under multiple cycles of cold-hot alternating damage effects. Comput Geosci (2024). https://doi.org/10.1007/s10596-024-10303-z

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