Water saturation, organic matter content, and fractures are important factors influencing the physical properties of shale. In this study, shale samples were subjected to heating at 1 °C/min and then gradual cooling. An initial suite of tests was conducted at temperatures of 100 °C, 200 °C, 300 °C, 400 °C and 500 °C. The P-wave and S-wave velocities were measured, rock mechanics parameters were calculated, and then the uniaxial compressive strength test was performed. The mineral composition changed at 500 °C and the montmorillonite transformation of the shale to illite and rock diagenesis were gradually enhanced. Under the condition of heating, shale water saturation and organic matter content were reduced. The difference in the thermal mineral grain (thermal expansion anisotropy and inhomogeneous thermal expansion.) caused the corresponding changes in the internal structure of the rocks. When the changes exceeded those of the rock itself to some extent, they tended to produce microcracks within the rock, resulting in a change in the rock mechanics parameters. The results provide the fundamental parameters for rock mechanics and an important guide for high-temperature wellbore stability and hydraulic fracturing.

含水饱和度，有机质含量和裂缝是影响页岩物理性质的重要因素。在这项研究中，页岩样品以1°C / min的速度加热，然后逐渐冷却。最初的一组测试是在100°C，200°C，300°C，400°C和500°C的温度下进行的。测量了P波和S波的速度，计算了岩石力学参数，然后进行了单轴抗压强度试验。矿物成分在500°C时发生了变化，页岩中的蒙脱石向伊利石和岩石的成岩作用逐渐增强。在加热条件下，页岩水饱和度和有机质含量降低。热矿物晶粒的差异（热膨胀各向异性和不均匀的热膨胀。）引起了岩石内部结构的相应变化。当变化在某种程度上超过岩石本身的变化时，它们往往会在岩石内产生微裂纹，从而导致岩石力学参数发生变化。研究结果为岩石力学提供了基本参数，为高温井筒稳定性和水力压裂提供了重要指导。