Coal Geology & Exploration


Cooling shock is an effective method to increase the permeability of geothermal reservoir by causing fractures on high temperature rock. For the purpose of quantitatively analyze the damage degree of granite caused by cooling shock at different heating temperatures and explore the damage mechanism under the action of cooling shock, the damage of high temperature granite samples under was analyzed under natural cooling and water cooling conditions by means of thin section observation and SEM scanning technology. The results show that when the heating temperature is increased from 200°C to 800°C, the crack density of the section A at the center of the rock sample increases by 17.6%-144.7% and 27.6%-163.7% respectively under natural cooling and water cooling. For the slice B 12.5 mm away from the center of the circle, the fracture density increases by 40.1%-202.8% and 61.3%-222.7% under natural cooling and water cooling conditions, respectively. The results also show that the damage degree of granite increases with the increase of heating temperature, and the damage degree of granite is greater when it is cooled by water than in air. In addition, the damage degree of granite is greater when it is closer to the sample surface due to the existence of thermal gradient. These conclusions not only provide experimental reference for understanding the effect of cooling shock on the damage of high-temperature granite, but also play a very important role in guiding the application of thermal stimulation method in reservoir reconstruction.


cooling shock, natural cooling, water cooling, crack density, damage degree, thermal gradient




[1] CUI Guodong,ZHANG Liang,REN Bo,et al. Geothermal exploitation from depleted high temperature gas reservoirs via recycling supercritical CO2:Heat mining rate and salt precipitation effects[J]. Applied Energy,2016,183:837−852.

[2] 张浩,徐拴海,杨雨,等. 地热井固井材料导热性能影响因素[J]. 煤田地质与勘探,2020,48(2):195−201. ZHANG Hao,XU Shuanhai,YANG Yu,et al. Influencing factors of thermal conductivity of cementing materials for geothermal wells[J]. Coal Geology & Exploration,2020,48(2):195−201.

[3] 许天福,张延军,曾昭发,等. 增强型地热系统(干热岩)开发技术进展[J]. 科技导报,2012,30(32):42−45. XU Tianfu,ZHANG Yanjun,ZENG Zhaofa,et al. Technology progress in an enhanced geothermal system(hot dry rock)[J]. Science & Technology Review,2012,30(32):42−45.

[4] SIRATOVICH P A,VILLENEUVE M C,COLE J W,et al. Saturated heating and quenching of three crustal rocks and implications for thermal stimulation of permeability in geothermal reservoirs[J]. International Journal of Rock Mechanics and Mining Sciences,2015,80:265−280.

[5] FREIRE-LISTA D M,FORT R,VARAS-MURIEL M J. Thermal stress-induced microcracking in building granite[J]. Engineering Geology,2016,206:83−93.

[6] ZHAO Zhihong. Thermal influence on mechanical properties of granite:A microcracking perspective[J]. Rock Mechanics and Rock Engineering,2016,49(3):747−762.

[7] WANG H F,BONNER B P,CARLSON S R,et al. Thermal stress cracking in granite[J]. Journal of Geophysical Research,1989,94(B2):1745−1758.

[8] AVANTHI ISAKA B L,GAMAGE R P,RATHNAWEERA T D,et al. An influence of thermally-induced micro-cracking under cooling treatments:Mechanical characteristics of Australian granite[J]. Energies,2018,11(6):1−24.

[9] SHEN Yanjun,HOU Xin,YUAN Jiangqiang,et al. Experimental study on temperature change and crack expansion of high temperature granite under different cooling shock treatments[J]. Energies,2019,12(11):1−17.

[10] SHEN Yanjun,HOU Xin,YUAN Jiangqiang,et al. Thermal cracking characteristics of high-temperature granite suffering from different cooling shocks[J]. International Journal of Fracture,2020,225(2):153−168.

[11] JIN Peihua,HU Yaoqing,SHAO Jixi,et al. Influence of different thermal cycling treatments on the physical,mechanical and transport properties of granite[J]. Geothermics,2019,78:118−128.

[12] 阴伟涛,赵阳升,冯子军. 高温三轴应力下粗、细粒花岗岩力学特性研究[J]. 太原理工大学学报,2020,51(5):627−633. YIN Weitao,ZHAO Yangsheng,FENG Zijun. Study on the mechanical properties of coarse-grained and fine-grained granite under high temperature triaxial stress[J]. Journal of Taiyuan University of Technology,2020,51(5):627−633.

[13] KIM K,KEMENY J,NICKERSON M. Effect of rapid thermal cooling on mechanical rock properties[J]. Rock Mechanics and Rock Engineering,2014,47(6):2005−2019.

[14] GLOVER P W J,BAUD P,DAROT M,et al. α/β phase transition in quartz monitored using acoustic emissions[J]. Geophysical Journal International,1995,120(3):775−782.

[15] SMALLEY I,MARKOVIC S B. Controls on the nature of loess particles and the formation of loess deposits[J]. Quaternary International,2019,502(part A):160−164.

[16] MAHABADI O K,TATONE B S A,GRASSELLI G. Influence of microscale heterogeneity and microstructure on the tensile behavior of crystalline rocks[J]. Journal of Geophysical Research:Solid Earth,2014,119(7):5324−5341.

[17] JUST J,KONTNY A. Thermally induced alterations of minerals during measurements of the temperature dependence of magnetic susceptibility:A case study from the hydrothermally altered Soultz-sous-Forêts granite,France[J]. International Journal of Earth Sciences,2012,101(3):819−839.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.