多道反褶积

MULTI-TRACE DECONVOLUTION

北京勘探开发研究院地质所

在常规反褶积方法中,地震记录自相关被用来代替子波的自相关.这种作法在反射系数为具有白功率谱的随机序列时是正确的.然而在实际应用中,常规反褶积因子总是在单道某时窗计算的.在此条件下,反射系数不是严格的随机序列.用多道估算子波自相关的方法可有效地保证反射系数的随机性,求取准确的子波自相关.用实逆对数谱方法,由子波自相关估算出最小相位子波,进而实现多道双边反褶积处理,可得到既具有高分辨率又具有较高信噪比的结果.

In conventional deconvolution, the wavelet’s autocorrelation was estimated by the autocorrelation of seismic traces. This has been proved to be right If the reflection coefficients were a stochastic sequence with white power spectrum. But in practice, the conventional decon-factor was always calculated with a window in a single trace. In such case, the reflection coefficients are not just a stochastic sequence in a strict sense. By estimating the wavelets’ autocorrelation with more than one seismic traces, the reflection coefficient could be ensured to be a stochastic ones and the wavelets’ autocorrelation could thus be obtained with desired accuracy. By using the real cepstrum method, the minimum phase wavelet could be obtained from the wavelets’ autocorrelation and the two-side multi-trace decon could thus be performed. Resultant with high resolution and high S/N ratio could be achieved in such a way.