基于中值滤波和seislet阈值法联合压制混叠噪声方法  

Blending noise suppression based on median filter and seislet domain threshold denoising approach

作　　者：董烈乾 王岩 霍禹 杜润林[2] 陈宝云 安学勇 DONG Lieqian;WANG Yan;HUO Yu;DU Runlin;CHEN Baoyun;AN Xueyong(BGP,CNPC,Zhuozhou 072751,China;Qingdao Institute of Marine Geology,Qingdao 266071,China)

机构地区：[1]中国石油集团东方地球物理公司,涿州072751 [2]青岛海洋地质研究所,青岛266071

出　　处：《物探化探计算技术》2019年第6期705-711,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国石油集团公司科学研究与技术开发项目(2017D-3501)

摘　　要：混采技术可以实现多台震源同时激发产生地震波场,有效提高采集效率,但是混采技术会产生严重的混叠干扰,降低地震数据的信噪比。针对此问题,引入多级中值滤波,设计了一种基于seislet域阈值去噪和多级中值滤波相结合的混叠噪声压制方法。该方法首先采用大步长中值滤波和seislet域阈值去噪相结合的方法得到初始压制混叠噪声的地震数据,再利用混叠算子计算去混叠噪声后地震数据的伪分离数据,然后求取该伪分离数据和原始混叠地震数据的差值,再次应用较小步长中值滤波提取剩余信号,并与上一步骤得到的去混叠后的地震数据相加,并再次进行seislet域阈值去噪,依次循环,直到信噪比达到期望值。通过模拟数据测试,并与F-K域迭代阈值去噪方法和常规seislet域迭代阈值方法相比,本方法在压制混叠噪声的同时,可以更好地保护有效信号。Blended acquisition technology has emerged as a promising way of significantly increasing the efficiency of seismic acquisition.However,there exist a huge challenge of severe interference noise and decrease the signal to noise(S/N)ratio of seismic data.Therefore,with today's processing practices,the success of blended acquisition relies heavily on separating signals from simultaneous source interference effectively.In the paper,we proposed an optimized blending noise suppression approach based on seislet domain threshold and multi-step median filter.Firstly,a median filter with a large step and a seislet domain threshold de-noising method are utilized to get the initial de-blended result.Then,the residual energy is extracted by subtracting the original blended data with the pseudo de-blended data of the initial de-blended result through the blending operator.Thirdly,a median filter is re-applied to extract the remained effective signal.Finally,we can get the final de-blended data by adding the remained effective signal and the above saved de-blended data until the S/N ratio satisfies the desired one.We demonstrate through simulated synthetic and field marine datasets the effectiveness of the approach.

关 键 词：混叠干扰 信噪比 伪分离 seislet域 多级中值滤波 迭代阈值 

分 类 号：P631.4[天文地球—地质矿产勘探]