多尺度子波分解技术在地震解释中的应用

分辨率是影响地震解释精度的关键因素,多尺度子波分解作为一种提高分辨率的方法是将地震信号通过连续小波变换分解为一系列不同的尺度子波的集合,由于尺度与频率是一一对应的,也就相当于把信号由时间域变换到时间—频率域,这样就把信号分解为不同主频的子波。然后再选择与目的层频率相对应的子波重新组合,便得到了分辨率与目的层固有频率相对应的地震剖面,提高了剖面的分辨率。把这种方法应用到阿拉德油田哈浅区块地震解释的研究中,在目的层位标定和追踪、断层解释以及地震岩性解释3个方面都取得了很好的应用效果,提高了地震解释的精度。

THE APPLICATION OF MULTI-SCALE WAVELET DECOMPOSITION TECHNIQUE IN SEISMIC INTERPRETATION

Resolution is the key factor that affects the accuracy of seismic interpretation. Muti-scale wavelet decomposition uses continuous wavelet transform to decompose the seismic signal into a series of a collection on different wavelet scales, it is equivalent to convert signals from time domain to the time-frequency domain due to the one-to-one relationship between the scale and frequency, and the signal is decomposed into different frequency of wavelet. Then reconstitution is made for the wavelet, whose frequency is corresponding to the target layer, to get the profile whose resolution is corresponding to the inherent frequency of the target layer. Therefore, the resolution of the profile is improved, we applied this method to the sedimentary interpretation of the Haqian block in the Alade oilfield, and better application results have been obtained in the three aspects of target horizon calibration and tracking, fault interpretation and seismic lithologic interpretation, and the accuracy of seismic interpretation is improved.