【摘要】 海洋地震资料预处理,两大难题就是噪音和多次波。常规的近道多次波压制有预测反褶积和SRME,中远道多次波压制有速度滤波等方法。然而在深水崎岖海底资料中,对于侧面反射、绕射多次波等等,常规的多次波压制方法往往失效,原因在于常规的多次波压制方法的理论多假设地震波是以二维双曲线方式传播,实际上地下地震波传播路径复杂,常规去多次方法有局限。另外对于噪音的压制,技术人员往往是头痛医头脚痛医脚,对不同的噪音采用不同的模块进行压制,即增加了处理步骤,也增加了损伤有效波的风险。本文研究了一种利用剔除拟合法并结合LIFT思想进行深水多次波和噪音压制技术,一次处理流程可以同时压制多种噪音和多种多次波,取得了良好的效果。更多还原

【Abstract】 There are two difficulties in the pre-processing on the sea seismic: noise and multiples.The predictive deconvolution and SRME are conventional methods for the near offset multiples and velocity filter for the middle and far offset multiples.However,it is always in failure for the lateral wave and diffraction multiple wave and so on.The reason is that the theory of de-multiples always assume that the seismic wave travel as 2D hyperbola form,and in fact the wave path is very complex.Therefore,there is a limitation in conventional multiple attenuation methods.In addition,for the noise attenuation,we always deal with the symptoms but not the disease.That means that we use different modules for different noises which increase the process step and the risk of damage.To solve the above problems,the author develops a noise and multiple attenuation approach based on the deletion fitting and LIFT which could attenuate different noises and multiples in one step,and the effect is very good.更多还原