饱和砂岩在温度和频率域的衰减和速度频散  

Attenuation and dispersion of saturated rocks in temperature and frequency domains

作　　者：席军[1] 宛新林[2] 周城光[3] 杜赟[4,5] 席道瑛[4,5] 

机构地区：[1]北京石油化工学院机械工程学院,中国北京102617 [2]安徽建筑工业学院土木工程学院,中国合肥230601 [3]中国科学院噪声与振动重点实验室,中国北京100190 [4]中国科学技术大学地球和空间科学学院 [5]蒙城地球物理国家野外观测站,中国合肥230026

出　　处：《地震学报》2013年第6期914-922,938,共9页Acta Seismologica Sinica

基　　金：国家自然科学基金项目(40874093)资助

摘　　要：利用Metravib热机械分析仪,在天然地震的频率和温度范围内,首次对泵油和甘油饱和两种孔隙度的彭山砂岩的衰减和速度频散进行了实验研究.结果表明,①泵油饱和彭山砂岩对频率和温度的依赖呈热激活弛豫规律;②杨氏模量和弹性波速度与孔隙度、温度呈负相关,与饱和液体的黏滞系数、频率呈正相关;③频散效应因频率上升而增强,因温度增高而减弱.这一规律性的结果为地震波理论研究提供了实验基础.Experiments are performed by Metravib dynamic mechanical analyzer about the attenuation and dispersion of pump-oil and glycerol saturated Peng shan sandstones with two kinds of porosities. The frequency and temperature of tests are natural earthquake. The results show： （1） The attenuation peak of pump-oil saturated Pengshan sandstone appears to be thermo-activated relaxa tion. （2） Young＇s modulus and elastic wave velocity of saturated Pengshan sand- stones reduce with porosity and temperature increasing, and rise with viscosity coefficient of saturated liquid and frequency increasing. （3） Frequency dispersion attenuates as temperature increases, enhances as frequency rises. The data pro- vides the experiment foundation for theoretical research of seismic waves.

关 键 词：饱和砂岩 衰减 模量 速度频散 

分 类 号：P315.31[天文地球—地震学]