摘要
从细观角度出发,借助高精度显微CT技术,以构建三维空间数字岩芯为基础,对花岗岩加热到相同温度后在相同冷却介质中急剧冷却到不同温度的细观演化过程进行研究,从热冲击后花岗岩的裂隙长度、宽度、和深度上进行具体分析,探究高温热冲击作用下冷却温度对花岗岩细观特性的影响。研究结果表明,花岗岩的热冲击作用随其在水中的冷却温度升高而变化明显。在水中冷却温度为100℃时,花岗岩热破裂最剧烈,说明在花岗岩热冲击破裂过程中,其破裂程度不仅与花岗岩的初始加热温度有关,还与其在水中急剧冷却的温度有关。此外,花岗岩热破裂后产生的孔隙—裂隙网络,会大大降低花岗岩的致密性,进而有助于增大地热开发中的热交换面积,有利于储层改造。
From the meso point of view, with the help of high-precision micro CT technology and based on the construction of three-dimensional spatial digital core, the meso evolution process of granite heated to the same temperature and rapidly cooled to different temperatures in the same cooling medium was studied. The factors of fracture length, width and depth of granite after thermal shock were analyzed in detail. The effect of cooling temperature on the meso properties of granite under high temperature thermal shock was studied. The results show that the thermal shock of granite changes obviously with the increase of its cooling temperature in water. When the cooling temperature in water is 100℃, the thermal fracture of granite is the most severe. It shows that in the process of thermal shock fracture of granite, the fracture degree is related not only to the initial heating temperature of granite, but also to the rapid cooling temperature in water. In addition, the pore fracture network generated after thermal fracture of granite will greatly reduce the compactness of granite, and then is helpful to increase the heat exchange area in geothermal development and reservoir reconstruction.
作者
郑红彦
ZHENG Hongyan(School of Civil Engineering and Architecture,Shanxi Technology and Business College,Taiyuan,Shanxi 030024,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第7期133-136,共4页
Mining Research and Development
关键词
花岗岩
热冲击
冷却温度
显微CT
细观破裂
Granite
Thermal shock
Cooling temperature
Micro-CT
Meso fracture
