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<p>This study investigated the impact of three different thermal scenarios on the physical-mechanical stability and fracture characteristics of granite, a widely accepted and prominent rock source for enhanced geothermal systems (EGS). The Closepet Batholith granite samples were exposed to three distinct heating scenarios, namely, direct (thermal shock), sequential (progressive heating), and cyclic heating (thermal stimulation), with a target temperature of 500˚C representing different thermal regimes in the EGS environment. The experimental results exposed that the cyclic heating induced a slighter damage in the tested granite compared to other heating programs, showing the potential of thermal stimulation for EGS. The other heating programs induced severe mechanical degradation, primarily with the formation of a wider microcrack network, and the cyclic heated samples showed more microcracks, confirmed from petrographical and SEM images. The Acoustic Emission (AE) datasets revealed that heating cycles induced a prolonged, unstable crack propagation zone due to the formation of a finer microcrack network, favouring permeability evolution. The RA-AF results highlighted the dominance of shear cracks in all the samples, irrespective of thermal conditions. Additionally, the diminished global b-value (0.64) supported thermal stimulation opportunities with the cyclic heating, compared to severe damage induced by sequential thermal treatment (0.89) and direct heating (0.86). These results underscore that heating regimes may mitigate the seismic risk associated with thermal stimulation, favouring sustainable energy generation through enhanced geothermal systems.</p>

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Implications of varying thermal regimes on the thermo-mechanical and fracturing characteristics of granite

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Vishnuraj M. Sivaraj,
  • Vinoth Srinivasan,
  • Venilla Manikanta,
  • Anupam Priyam

摘要

This study investigated the impact of three different thermal scenarios on the physical-mechanical stability and fracture characteristics of granite, a widely accepted and prominent rock source for enhanced geothermal systems (EGS). The Closepet Batholith granite samples were exposed to three distinct heating scenarios, namely, direct (thermal shock), sequential (progressive heating), and cyclic heating (thermal stimulation), with a target temperature of 500˚C representing different thermal regimes in the EGS environment. The experimental results exposed that the cyclic heating induced a slighter damage in the tested granite compared to other heating programs, showing the potential of thermal stimulation for EGS. The other heating programs induced severe mechanical degradation, primarily with the formation of a wider microcrack network, and the cyclic heated samples showed more microcracks, confirmed from petrographical and SEM images. The Acoustic Emission (AE) datasets revealed that heating cycles induced a prolonged, unstable crack propagation zone due to the formation of a finer microcrack network, favouring permeability evolution. The RA-AF results highlighted the dominance of shear cracks in all the samples, irrespective of thermal conditions. Additionally, the diminished global b-value (0.64) supported thermal stimulation opportunities with the cyclic heating, compared to severe damage induced by sequential thermal treatment (0.89) and direct heating (0.86). These results underscore that heating regimes may mitigate the seismic risk associated with thermal stimulation, favouring sustainable energy generation through enhanced geothermal systems.