局部瞬时频率提取及其在大庆油田中的应用

Local instantaneous frequency extracting method and its application to the Daqing Oilfield

常规的基于Hilbert变换的瞬时频率提取方法对噪声极为敏感,且会提取出不具有物理意义的瞬时频率.本文介绍了抗噪性能较为优异的局部瞬时频率,重点讨论了提取局部瞬时频率的方法原理,将形状正则化方法和FFT相结合给出一种快速实现方法.通过分析合成信号和实际地震信号,说明局部瞬时频率具有良好的抗噪性能.最后,我们提取大庆油田实际资料的局部瞬时频率,结果表明:相比于瞬时频率,局部瞬时频率具有更高的信噪比,能够更好地刻画沉积地质现象.

Abstract The instantaneous frequency extracting method based on Hilbert transform is sensitive to noise, and probably the result is not trustable for negative instantaneous frequency. In this paper, we present local instantaneous frequency which has good anti-noise ability. After introducing local instantaneous frequencyts principle, we propose a fast realizing method based on shaping regularization and FFT. We show local instantaneous frequencyPs good anti- noise ability through analyzing synthetic signal. Finally, we extract local instantaneous frequency of Daqing＇s real data and the result shows local instantaneous frequency can depict the sedimentary geological phenomena clearly.