深拖平缆采集资料中鬼波衰减方法探讨

鬼波衰减是深拖平缆采集资料处理中非常重要的一步,也是实现宽频处理的关键步骤。为此,笔者分析了深拖平缆资料特点,推导了鬼波的时距曲线方程,在此基础上,介绍了线性Radon域最小平方反演方法衰减鬼波的基本原理,该方法首先通过最小平方方法求得无鬼波的Radon域数据,再应用反变换算子中的一次波算子进行反变换,从而实现了对鬼波的压制。采用该理论对模型数据与实际地震资料进行了试处理,结果表明,深拖平缆资料通过本文的鬼波衰减技术处理后,陷频点得到了补偿,有效频带得到了拓宽,达到了宽频处理的效果。

The application of broadband processing technology to deep towing flat streamer data

Ghost attenuation,the key step of broadband processing,is a very important step in data-processing of deep towing flat streamer.Therefore,this paper analyzes the features of deep towing flat cable data,derives time distance curve equation of ghost and,on such a basis,introduces the basic principle of the linear least square inversion in Radon domain method for ghost attenuation.First,no ghost data is obtained by the least square method in Radon domain,then the primary wave operator is used in inverse transform,so as to realize the attenuation of ghost.The processing effect of model and actual data shows that,after ghost attenuation,the frequency notches of deep towing flat cable data can be compensated,and the effective frequency bandwidth can be broadened,thus achieving the effect of broadband processing.