摘要
利用峰值频率移动法估算零偏VSP资料的品质因子Q.该方法用Ricker子波和匹配地震子波分别逼近零相位和混合相位的震源子波,得到了峰值频率移动法估计Q值的公式.进而针对常规方法估计的地震子波峰值频率精度不高的问题,提出了估计地震子波峰值频率的特征结构法.通过合成零偏VSP资料的仿真试验,验证了峰值频率移动法估计Q值的正确性.仿真结果表明,与快速Fourier变换和Burg最大熵方法相比较,特征结构法得到的峰值频率和Q值精度高一些.仿真结果也表明,用峰值频率移动法估计Q值时需要选取恰当的子波参数,否则影响Q值估计的精度.
Quality factors of zero-offset VSP data are estimated by peak frequency shift （PFS） method. The approach employs Ricker wavelet and matching seismic wavelet to approximate zero-phase source wavelet and mixed-phase source wavelet respectively, and formulas for Q-values estimation with PFS method are obtained. Moreover, focusing on the problem that peak frequencies of seismic wavelets calculated by common methods are imprecise, eigen-struct （ES） method for estimating peak frequencies of seismic wavelets is proposed. The validity of PFS method for Q-values estimation is verified through simulation of synthetic zero-offset VSP data. Results indicate that peak frequencies and Q-values derived from ES method are more precise than those derived from methods of fast Fourier transform and Burg＇s maximum entropy. Results also make clear that Q-values estimation with PFS method needs to choose appropriate parameters of wavelet, or precision of Q-values estimation will be affected.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第4期1198-1209,共12页
Chinese Journal of Geophysics
基金
国家自然科学基金项目(40174032)资助.
关键词
品质因子
峰值频率
衰减
匹配地震子波
Quality factor （ Q）, Peak frequency, Attenuation, Matching seismic wavelet （MSW）
作者简介
高静怀，男，1960年生，教授，博士生导师，1997年获西安交通大学博士学位．主要从事复杂介质中地震波传播与成像及地震资料处理的理论与方法等研究．E-mail：jhgao@mail．xjtu．edu．cn
