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多道小波波阻抗反演
Multitrace wave impedance inversion using wavelet transform
【摘要】 鉴于地震数据中不同的频段有不同的信噪比,以及相邻地震道的反射波有效成分在波形和能量上有较强的相关性,作者结合小波变换的特点,运用多道记录同时进行波阻抗及演,即在迭代过程中将实际地震记录与模型合成记录的残差道进行小波分解,形成残差道分频小波剖面。然后利用K-L变换提取分频剖面中的相干部分用于波阻抗变化量的计算,从而避免了噪声参与波阻抗变化量的计算。本文展示了理论模型与实际应用的例子,说明这种反演方法稳定性强,具有良好的应用前景。
【Abstract】 Seismic data in different frequency bands have different signal/noise ratios,and there is good correlation between waveforms or energies of corresponding use-ful reflections on adjacent traces. In view of above fact, simultaneous multitracewave impedance inversion is achieved by using wavelet transform characteristics.To speak in detail, in iteration process, we finish reasonable wavelet decompositionof residual traces resulting from real and synthetic seismograms to form the fre-quency-division wavelet section of residual traces ; then, with the use of K-L trans-form, the coherent contents of frequency-division section are taken to estimatewave impedance variations, thus preventing noise from joining in the estimation ofwave impedance variations. Theoretical model and real example are given to provethe inversion method stable and widely applicable.
【Key words】 wave impedance inversion; wavelet transform; multiple traces; K-L transform; noise;
- 【文献出处】 石油地球物理勘探 ,OIL GEOPHYSICAL PROSPECTING , 编辑部邮箱 ,1998年04期
- 【分类号】P631.4
- 【被引频次】6
- 【下载频次】130