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传统的基于相位校正求和(dephase and sum)的上下缆地震数据合并技术在估计鬼波算子时假设海面是平静的。一般来说,实际的海面是起伏的,不满足平静海面假设,所以传统的相位校正求和方法在实际工作中所取得的效果不尽如人意。本文提出了一种自适应的上下缆地震数据合并技术,和传统方法相比,所提方法保留了传统方法所得到鬼波算子的相位谱,并在此基础上利用数据本身进一步自适应的估计鬼波算子的振幅谱,最后利用估计得到的鬼波算子实现上下缆数据的合并,达到压制鬼波的目的。我们将所提方法应用到人工合成单炮数据上,实验结果证实了所提方法在起伏海面情况下的有效性。最后我们将所提方法应用到一个实际的上下三缆地震数据上,实验结果证明了所提方法能很好地压制鬼波,并拓宽有效频带。
The traditional technique of combining the upper and lower cable seismic data based on the phase dephase and sum assumes that the sea surface is calm when estimating the ghost operator. In general, the actual sea surface is undulating, does not meet the hypothesis of calm sea, so the traditional phase correction summation method in the actual work achieved unsatisfactory results. In this paper, we propose an adaptive technique for combining seismic data of upper and lower cable. Compared with the traditional method, the proposed method retains the phase spectrum of the ghost operator obtained by the traditional method and uses the data itself to be more adaptive Estimate the amplitude spectrum of the ghost operator, and finally use the estimated ghost operator to realize the combination of the upper and lower cable data, so as to suppress the ghost wave. We apply the proposed method to synthetic single shot data, and the experimental results confirm the effectiveness of the proposed method in the case of fluctuating sea surface. Finally, we apply the proposed method to an actual upper and lower three-line seismic data. Experimental results show that the proposed method can suppress ghost waves well and broaden the effective frequency band.