CAJ | 학술논문

实际地震资料处理中的子波是混合相位,对此提出一种改进的混合相位反褶积流程.在地震道中抽取一个标准道,利用谱模拟的方法求出地震子波的自相关;利用计算子波的自相关,设计了一个最小相位的滤波器,增加一个延迟量于自相关函数主对角线上,将最小相位滤波器分解为一个长度很短的滤波器和一个长度较长滤波器的褶积,得到一系列混和相位的子波和混和相位滤波器;将这些混和相位滤波器与原始地震道进行褶积,选出最佳的混和相位滤波器.通过理论模型与实际地震资料对比,证明混和相位反褶积优于最小相位反褶积.
실제지진자료처리중적자파시혼합상위,대차제출일충개진적혼합상위반습적류정.재지진도중추취일개표준도,이용보모의적방법구출지진자파적자상관;이용계산자파적자상관,설계료일개최소상위적려파기,증가일개연지량우자상관함수주대각선상,장최소상위려파기분해위일개장도흔단적려파기화일개장도교장려파기적습적,득도일계렬혼화상위적자파화혼화상위려파기;장저사혼화상위려파기여원시지진도진행습적,선출최가적혼화상위려파기.통과이론모형여실제지진자료대비,증명혼화상위반습적우우최소상위반습적.
Mixed-phase deconvolution is proposed to process the seismic data,, with a new flowchart of the mix-phase deconvolution, based on the fact that the seismic wavelet is a mix-phase wavelet. Firstly, the amplitude spectrum of the seismic .wavelet is fitted by least squares method according to the relationship between the autocorrelation of the seismic records and the autocorrelation of the seismic wavelet, and then the autocorrelation of the seismic wavelet is computed anew. Secondly, a minimum phase filter is designed by using computed autocorrelation of the seismic wavelet, a delay is added to the dominant diagonal of the autocorrelation function, a minimum phase filter is decomposed into a short filter and is convoluted with a longer filter, resulting in a series of mixed phase wavelets and a mixed phase filter. Finally, the resulted mixed phase filter is convoluted with raw seismic traces, and an optimal mixed phase filter and an associated mixed phase wavelet are selected. The model test and the real data processing show that the mixed phase deeonvolution is better than the minimum phase deeonvolution.