摘要
高效混叠采集技术可以实现多组激发源同时激发产生地震波场,大大提高采集效率,但是由于相邻激发源之间较短的等待时间,会使得地震数据产生严重的混叠干扰,影响地震数据成像质量。针对此问题,设计了一种改进型seislet域迭代阈值压制混叠噪声方法。该方法首先采用中值滤波对经过NMO后的混叠数据进行滤波,然后利用seislet域迭代阈值去噪技术提取剩余的有效信号,并和经过中值滤波后的结果相加,接着再利用混叠算子计算去混叠噪声后地震数据的伪分离结果,然后求取该伪分离数据和原始混叠地震数据的差值,再次重复上述步骤,将每步骤提取的剩余有效信号进行累加,直到信噪比达到期望值,输出最终压制混叠噪声的地震数据。通过数据验证,本文改进方法可以在压制混叠干扰的同时,有效的保护信号。
High productivity acquisition technology can improve the efficiency of seismic acquisition.However,the existence of blended noise between adjacent sources severely decreases the signal to noise(S/N)ratio of seismic data and limits the application in the field.To solve the issue,an improved blended noise suppression approach is proposed by combining NMO,median filter with the seislet transform based threshold de-noising.Firstly,median filter is applied to the original blended data with NMO correction.Next,we continue to extract the residual energy to get the de-blended result by the seislet transform based threshold denoising.Then,re-process the residual data by subtracting the original pseudo de-blended data and the pseudo de-blended data of the de-blended result from each iteration as the above processing flow.Finally,the final de-blended data is obtained by adding the remained energy of each iteration.Simulated data tests demonstrate the proposed approach can protect effective signal while suppressing the blended noise.
作者
董烈乾
周恒
郭善力
蒋连斌
蒋忠
于文杰
DONG Lie-Qian;ZHOU Heng;GUO Shan-Li;JIANG Lian-Bin;JIANG Zhong;YU Wen-Jie(BGP Inc.,China National Petroleum Corporation,Zhuozhou 072751,China)
出处
《物探与化探》
CAS
北大核心
2020年第3期568-572,共5页
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)。
关键词
高效混叠采集
混叠干扰
seislet域
中值滤波
伪分离
迭代阈值
high productivity acquisition
blended noise
seislet domain
median filter
pseudo de-blended
iterative threshold
