摘要
地层的品质因子对衡量地震波传播过程中的能量衰减具有重要意义。实际上对品质因子的反演困难且存在不确定性。基于介质中的地震波传播理论,从方法原理、模型试算和实际资料验证等方面,对比分析了目前常用的5种提取品质因子的方法,即频谱比法、中心频率偏移法、上升时间法、振幅衰减法和解析信号法,认为:频率域方法更稳定,多种方法应联合使用等。
Quality factor is of great significance in quantifying the absorption of seismic energy in wave propagation because of the visco-elasticity of subsurface media.The quality factor is often non-unique when it is inversed from in-situ data.In this paper,based on the fundamental theory of wave propagation in media,we investigated 5 widely used methods of Q-factor inversion.They are spectral ratio method,centroid-frequency shift method,amplitude decay method,rise-time method,and analytical signal method.It is concluded that frequency-domain methods are more stable,and different methods should be used jointly.
出处
《勘探地球物理进展》
2009年第4期252-256,共5页
Progress in Exploration Geophysics
基金
国家973计划(2007CB209605)
国家863计划(2007AA060502)资助
关键词
品质因子
地层吸收
地震波传播
微测井
quality factor
stratigraphic absorption
seismic wave propagation
uphole survey
