Ground Roll Attenuation in Time-Frequency and Its Application
详细信息
- 责任者：Yang Zhaobin (Geophysical Research Institute ; BGP ; CNPC ; Zhuozhou 072750 ; China) ; Zhang Mingji
- 刊名：Computing Techniques for Geophysical and Geochemical Exploration
- 出版年：2011
- 卷期：33(1)
- 关键词：面波 ; surface waves ; 衰减系数 ; attenuation coefficient ; 地震滤波 ; seismic filtering
- 页码：p.30-35
- 图表：6 illus., 1 table, 9 refs.
- 分类号：1600
- issnNo：ISSN1001-1749
- isbnNo：CN51-1242/P
摘要
Ground roll is a kind of strong noises in seismic data. Some methods are applied to attenuate ground roll such as frequency filter, F-K filtering,velocity filtering and so on, which have limitations because of the frequency dispersion of ground roll. A new method is proposed based on the ground roll’s features that change with offsets, which includes: 1) understanding the characteristics of ground roll with offsets by decomposing the zone data contained ground roll using Fourier or time-frequency analysis; 2) designing filters with different offsets and apply them to data; 3) analyzing the removed noises by subtract them from raw data and research the filter parameters; and 4) determining the optimal parameters in time-frequency and offset domain to ensure that the authors attenuate noise and preserve the low frequency signals. The results are obtained when applying the method to high density seismic data.