【摘要】 在高温作用下岩石内部物理化学特性和结构特性将发生变化,这将导致裂隙延伸、矿物脱水及汽化,改变了岩石孔隙率,从而使得岩石的渗透率发生明显的变化。基于热弹性理论,结合室内试验测试结果,导出岩石渗透率和温度之间存在正指数关系,并从理论上验证了温度门槛值的存在。理论分析和试验研究均表明:在温度开始升高时,渗透率增加缓慢,当升高到某一温度之后,渗透率升高的速度迅速增大,其温度对应的值为门槛值。经过门槛温度之后岩石的渗透率随温度升高而迅速增加。岩石渗透率–温度关系的研究为研究高温下的多场耦合问题提供理论基础,同时为石油热开采提高渗透率和核废料地下安全性处理提供了技术支持。更多还原

【Abstract】 The physicochemical and structure properties of rock will change obviously under high temperature, which causes extending of fracture,dehydrating and vaporizing of mineral and changes of rock porosity and permeability. Based on thermo-elastic theory and column test results,the positive index relationship between rock permeability and temperature was deduced,and temperature threshold value was validated theoretically. When temperature begins to increase,the rock permeability increases slowly. When the temperature increases to a certain value,the speed of permeability rising increases rapidly;and this temperature is called initiation threshold value. After the temperature initiation threshold,the permeability of the rock rises quickly. The study of the relationship between rock permeability and temperature offers the theoretical foundation for the studying of multi-field coupling question under the high temperature. It gives theoretical support for permeability of petroleum thermal exploitation and for nuclear waste safety disposal.更多还原