Rock permeability is a key parameter in evaluating the CO₂ storage capacity and injectivity in geologic CO₂ sequestration projects. To investigate the influences of confining pressure and testing temperature on rock permeability, seepage tests were carried out on four cylindrical sandstone specimens using a newly developed triaxial permeability measurement system. In this study, the confining pressure was loaded and unloaded stepwise between 10 and 30 MPa at different temperatures (25–90 °C). The experimental results showed that as the effective confining pressure increased in the loading process, sandstone permeability decreased nonlinearly. As the effective confining pressure decreased in the unloading process, permeability increased nonlinearly. Elevated temperature decreased the sandstone permeability, and the percentage reduction in permeability decreased with increasing temperature. Micropore space closure and thermal expansion were evidence of the permeability changes as the confining pressure and testing temperature were varied. The experimental results obtained in the seepage tests under the different confining pressures and elevated testing temperatures provide a reference for evaluating rock permeability in underground engineering.

岩石渗透率是评估地质CO ₂的CO ₂储存能力和注入能力的关键参数隔离项目。为了研究围压和测试温度对岩石渗透率的影响，使用新开发的三轴渗透率测量系统对四个圆柱形砂岩标本进行了渗流测试。在这项研究中，在不同温度（25–90°C）下，在10至30 MPa之间逐步加载和卸载围压。实验结果表明，随着有效围压在加载过程中的增加，砂岩的渗透率非线性降低。随着有效围压在卸荷过程中减小，渗透率非线性增加。高温降低了砂岩的渗透率，渗透率的降低百分比随温度升高而降低。随着围压和测试温度的变化，微孔空间的封闭和热膨胀是渗透率变化的证据。在不同的围压和升高的测试温度下，通过渗流试验获得的实验结果为评估地下工程的岩石渗透性提供了参考。