几种提取品质因子方法的对比分析  

Comparison of several computational methods of quality factor

作　　者：宫同举[1] 孙成禹[1] 彭洪超 肖云飞[1] 孙甜甜[1] 

机构地区：[1]中国石油大学(华东),山东青岛266555 [2]中国石油集团东方地球物理公司,河北涿州072751

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

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.

关 键 词：品质因子 地层吸收 地震波传播 微测井 

分 类 号：P631.4[天文地球—地质矿产勘探]