Ground roll attenuation using the S and x‐f‐k transforms
Ground roll attenuation using the S and x‐f‐k transforms
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DOI：
10.1111/j.1365-2478.2007.00659.x
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发表时间：
2007-09
影响因子：
2.6
通讯作者：
R. Askari;H. Siahkoohi
中科院分区：
文献类型：
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作者：
R. Askari;H. Siahkoohi
地滚波具有低频、高振幅的特点，是陆基地震采集中的老地震数据处理问题。地滚波衰减的常用技术是频率滤波、f-k 或速度滤波以及基于时间偏移加窗傅立叶变换的 f-k 滤波。这些技术假设地震信号是静止的。在本研究中，我们利用 S、x-f-k 和 t-f-k 变换作为傅里叶变换的替代方法。 S 变换是一种时频变换，可提供频率相关的分辨率，同时保持与傅立叶频谱的直接关系。将基于 S 变换的滤波器应用于陆地地震炮记录，可在时频域中衰减地滚波。 t-f-k 和 x-f-k 变换是分别在时间域和偏移域中定位地震记录视速度面板的方法。这些变换提供了一种方便的方法来定义不同偏移或时间的单独 f-k 面板上的偏移或随时间变化的拒绝区域。
Ground roll, which is characterized by low frequency and high amplitude, is an old seismic data processing problem in land‐based seismic acquisition. Common techniques for ground roll attenuation are frequency filtering, f‐k or velocity filtering and a type of f‐k filtering based on the time‐offset windowed Fourier transform. These techniques assume that the seismic signal is stationary. In this study we utilized the S, x‐f‐k and t‐f‐k transforms as alternative methods to the Fourier transform. The S transform is a type of time‐frequency transform that provides frequency‐dependent resolution while maintaining a direct relationship with the Fourier spectrum. Application of a filter based on the S transform to land seismic shot records attenuates ground roll in a time‐frequency domain. The t‐f‐k and x‐f‐k transforms are approaches to localize the apparent velocity panel of a seismic record in time and offset domains, respectively. These transforms provide a convenient way to define offset or time‐varying reject zones on the separate f‐k panel at different offsets or times.