摘要
由于地震数据中的噪声干扰,子波振幅谱的高频和低频段扰动强烈,造成振幅谱质心频移法估计Q值的稳定性依赖于积分频带的选取。为此,提出了基于能量谱的质心频移Q值估计的新方法,推导了估计Q值的解析表达式。模型测试证实了能量谱质心频移法相对于振幅谱质心频移法,对积分频带的依赖性降低、稳定性增强。经实测VSP资料应用证实了该方法可以稳定有效地估计Q值。
High and low frequency components of amplitude spectra are susceptible to random noises, which will make the centroid frequency shift (CFS) method depend on the selection of frequency band. To overcome this problem, a novel Q extraction method based on the centroid frequency shift of energy spectrum is proposed in this paper. The analytical relation between the Q factor and the centroid frequency of the energy spectrum is derived. Numerical tests show that the estimated Q with the proposed method is less dependent on frequency bands and is more robust than the conventional CFS method. Applications to real VSP data shows that the estimated Q is reasonable, which demonstrates that the proposed method is practicable. © 2016, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2016年第5期863-867,833-834,共5页
Oil Geophysical Prospecting
关键词
Q值
质心频率
能量谱
振幅谱
VSP
Frequency bands
Frequency shift keying
Numerical methods
Q factor measurement
Seismic prospecting
Spectroscopy
