基于分治算法的谷值因子斜缆数据鬼波压制方法

A method to suppress ghost waves in variable-depth streamer data by searching for the valley value factor based on the partition algorithm

斜缆采集技术可以有效地压制虚反射和拓宽地震频带,但是利用变深度缆采集地震数据压制鬼波的方法中需要给定一个准确的鬼波延迟时间,鬼波延迟时间的准确性对鬼波压制效果影响很大。提出了谷值因子的概念,认为谷值因子是判断斜缆采集数据每一道鬼波延迟时间准确性的一个参数,可以通过分治算法搜索获得的谷值因子确定更加精确的鬼波延迟时间,进而通过数据最优化联合反褶积方法获得最优的鬼波压制效果。模型试算和实际数据处理结果表明,本文方法能够有效地压制变深度缆地震数据中的鬼波,消除鬼波陷波效应的影响,拓宽地震数据的频带。

In order to be effective in ghost reflection suppression and seismic band broadening,the deghosting method with variable-depth streamer（VDS）data acquisition requires an accurate ghost wave delay time,and its accuracy is significant for the results of deghosting.The concept of the valley value factor is proposed,which is a parameter to judge the accuracy of every ghost delay time during variable-depth streamer data acquisition.The valley value factor out of the search by the divide-and-conquer algorithm can more accurately determine the ghost delay time and lead to optimal deghosting effects with the optimal algorithm and deconvolution joint method.Model tests and seismic data processing results suggest that the method in this paper can effectively suppress the ghost waves in variable-depth streamer data,eliminate the effects of notches,and broaden the seismic frequency band.