摘要
地层的品质因子Q对衡量地震波传播过程中的能量衰减以及预测油气具有重要意义。生产中最常用的方法是通过频谱比法求品质因子Q值,但是传统的频谱比法面临时窗选取等问题。利用S变换优越的时频分析特性以及与傅里叶谱直接相联系的特性,提取地层上下界面对应的瞬时频谱,然后通过拟合频率与振幅比的关系,得到地层的品质因子Q值。通过数值模拟证明了该方法的有效性。
It is important to measure quality factor Q in the processing of seismic wave propagation and the predictiing of hydrocarbon.In practical production,the most commonly used to estimate quality factor Q is spectral ratio method.However,the traditional spectral ratio method is facing windowing problem.In this paper,the authors took the advantage of superior time-frequency characteristics of the S-transform and the direct linkage between the Fourier spectrum and the S-transform to extract the corresponding instantaneous spectra of the upper and lower interfaces of the formation.Then by fitting the relationship between frequency and amplitude ratio,the authors estimated the quality factor.Numerical simulation shows the effectiveness of this method.
出处
《物探与化探》
CAS
CSCD
2013年第1期113-116,共4页
Geophysical and Geochemical Exploration
基金
国家科技重大专项(2008ZX05046)
关键词
品质因子Q
S变换
频谱比法
quality factor
S-transform
spectral ratio method
