【摘要】 同态反褶积受噪声及反射系数非随机性的影响,计算出的子波相位稳定性差,难以用于实际生产。使用小时窗、多道数据计算平均复赛谱和平均自相关函数复赛谱,利用二者计算混合相位子波,从而增加子波相位的稳定性,使同态反褶积的实用性大大增强。在实际资料处理过程中,使用了多种方法增加子波稳定性:①对地震数据进行指数衰减,使地震子波变为最小相位;②对求出的子波进行能量定位,选择能量集中的部分,对计算出的子波进行窗口整形,从而减少子波旁瓣的影响;③调整计算子波与期望子波峰值时差;④在三维叠后地震数据中使用Inline和Crossline双方向道计算中央道算子。理论模型试验结果表明,该方法适用于混合相位子波地震数据;实际数据应用结果表明,采用该方法计算出的子波稳定性强,反褶积后地震数据的分辨率得到了提高。更多还原

【Abstract】 Influenced by noise and non-random reflection coefficient,homomorphic deconvolution is hardly used in seismic data processing because of unstable phase of extracted wavelet.Aiming at the problem,we proposed calculating mixed phase wavelet by using combining average Cepstral with average autocorrelation Cepstral,which were computed by small windows and multi-traces data,to improve the stability of wavelet phase and the practicability of homomorphic deconvolution.During the actual data processing,some countermeasures were used to improve the wavelet stability.Firstly,seismic wavelet is changed into mini-phase wavelet by exponential decay on seismic data.Secondly,after energy positioning on the obtained wavelet,the energy concentration part of wavelet is chosen to carry window shaping,and the influence of wavelet side lobe is suppressed.Thirdly,the peak moveout between extracted wavelet and expected wavelet is adjusted.Finally,for 3-D post-stack data,the central trace deconvolution operator is calculated in adjacent multi-traces of INLINE and CDP directions.Theoretical model testing result proved that this method can be used in mixed-phase wavelet seismic data.Real data application results after deconvolution indicated that the calculated wavelet is stable and the resolution of seismic data is enhanced.更多还原