【摘要】 非完全弹性介质会引起地震波的传播能量衰减和相速度频散,从而影响地震成像分辨率。因此在地震波正演和反演中需要十分重视对能量衰减和相速度频散问题的研究。本文在分析造成能量衰减和相速度频散的机理及其诸多影响因素的基础上,基于Boltzmann提出的线性非弹性介质本构关系,以Kjartansson常Q模型为例,系统推导了该模型的吸收系数及相速度频散关系,并全面分析了8种非完全弹性介质模型的能量吸收、相速度频散关系与特征,可为非完全弹性介质品质因子Q值估计以及反Q补偿等问题的研究提供有益的借鉴。更多还原

【Abstract】 Anelasticity of subsurface medium causes seismic energy absorption and phase-velocity dispersion and reduces the resolution of seismic image consequently.It has been one of the important objectives of seismic modeling and inversion.The micro-mechanism of seismic attenuation and dispersion is complicated and affected by many subsurface medium’s environmental conditions.Based upon the Boltzmann superposition principle,the attenuation coefficient and phase-velocity dispersion equations of Kjartansson constant-Q model have been deduced systematically.The energy absorption and phase-velocity dispersion characteristics of eight anelastic models have been compared and analyzed completely.This research is contributive to study on the anelasticity of subsurface medium and related issues such as estimation of quality factor and inverse Q filtering.更多还原