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USE OF WAVELET CROSS-CORRELATION FOR VIRTUAL SOURCE DENOISING

机译:小波互相关在虚拟源去噪中的应用

摘要

Seismic shot gather data is received from a computer data store for processing. The received seismic shot gather data is separated into downgoing and upgoing wavefields, a time-frequency-wavenumber (t-f-k) three-dimensional (3D) data cube comprising multiple time-frequency (t-f) slices is formed. The downgoing wavefields are wavelet transformed from a time (t) domain to a t-f domain and the upgoing wavefields are wavelet transformed from the t domain to the t-f domain. A wavelet cross-correlation is performed between the downgoing wavefields in the t-f domain and the upgoing wavefields in a t-f-k domain to generate wavelet cross-correlated data. Soft-threshold filtering if performed for each t-f slice of the t-f-k 3D data cube. An inverse wavelet transform is performed to bring wavelet cross-correlated data from the t-f-k domain to a time-receiver (t-x) domain. All seismic shots of the received seismic shot gather data are looped over and the wavelet cross-correlated data is stacked as a virtual source gather.
机译:从计算机数据存储接收地震炮弹收集数据以进行处理。接收到的地震炮波采集数据被分为下行波场和上行波场,一个时频波数( tfk )三维(3D)数据立方体,其中包含多个时频( tf )切片形成。将下行波场从时间(t)域小波变换到t-f域,将上行波场从t域转换为 t- f域小波。在t-f域中的下行波场和 t-f-k 域中的上行波场之间执行小波互相关,以生成小波互相关数据。如果对 t-f-k 3D数据立方体的每个t-f切片执行软阈值滤波。进行小波逆变换,将小波互相关的数据从 t-f-k 域带到时间接收器(t-x)域。将接收到的地震波集数据的所有地震波循环,并将小波互相关数据堆叠为虚拟源波集。

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