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通过Metravib热机械分析仪,用固定静载为100 N、正弦波动载荷为60 N的应力-应变实验方法,在温度为-50—175℃,升温速率为1℃/min,频率为1—1000 Hz的条件下,对泵油饱和长石砂岩、彭山砂岩样品进行单轴循环加载实验,研究了饱和多孔岩石在弹性范围内的衰减、耗散角、杨氏模量和弹性波波速随温度利频率的变化规律.取得了随频率增高饱和多孔岩石的衰减峰和耗散角峰的峰位向高温方向移动的热激活弛豫规律,并求得弛豫峰的激活能和跃迁频率,以饱和砂岩的特点对此作出了解释.发现岩石中矿物离子置换时的相变内耗峰,并用动态观点解释了该相变峰.还获得杨氏模量和弹性波波速随温度升高而下降、随频率增高而增大的频散效应,随温度升高频散效应有减弱的趋势.该研究结果对理论模型研究具有指导意义,对地震资料的解释具有实用价值.
Through the Metravib thermomechanical analyzer, a stress-strain experiment was carried out with a fixed static load of 100 N and a sinusoidal fluctuating load of 60 N at a temperature of -50-175 ° C., a heating rate of 1 ° C./min and a frequency of 1-1000 Hz, the uniaxial cyclic loading experiments of pump-saturated feldspar sandstone and Pengshan sandstone were carried out. The attenuation, dissipation angle, Young’s modulus and elastic wave velocity of saturated porous rock in the elastic range were studied with temperature And the variation law of the frequency is obtained.The heat activation relaxation law of the attenuation peak and the dissipation angle peak of the saturated porous rock with increasing frequency is obtained and the activation energy and the transition frequency of the relaxation peak are obtained The characteristics of saturated sandstone are explained by the discovery of the internal friction peak during the phase transition of mineral ions in the rock, and the phase transition peak is explained by the dynamic viewpoint. The Young’s modulus and elastic wave velocity are also decreased with increasing temperature, The dispersion effect increasing with increasing frequency tends to weaken with increasing temperature.The results of this study are instructive for the study of theoretical models and have practical value for the interpretation of seismic data.