| Suppressing random noise to broaden the useful bandwidth of seismic reflection data |
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| 引用本文： | 刘学伟 勾丽敏. Suppressing random noise to broaden the useful bandwidth of seismic reflection data[J]. 应用地球物理, 2007, 4(1): 37-44. DOI: 10.1007/s11770-007-0006-y |
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| 作者姓名： | 刘学伟 勾丽敏 |
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| 作者单位： | Department of Applied Geophysics, China University of Geosciences, Beijing 100083, China. |
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| 基金项目： | Acknowledgements This research was supported by BGP, who also provided the real data, and the K. C. Wong Education Foundation. Liu Xuewei thanks The Royal Society for a fellowship which enabled him to spend a sabbatical year at the University of Durham and Neil Goulty for helping with the preparation of this paper. |
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| 摘 要： | The signal-to-noise ratio （SNR） of seismic reflection data in many areas is rather poor and conventional two-dimensional filters designed to suppress noise with different moveout from the signal tend to generate artifacts. We have extended a method of multichannel filtering, based on the hypothesis that signals on adjacent channels are similar, for enhancing the SNR on stacked sections. Using only the mid-range frequencies where the SNR is highest, the event trend is found for overlapping windows on the section and the average signal vector is calculated. Then the data from the full bandwidth section are projected onto the spatially varying unit similarity vectors and the results are merged for the overlapping windows. Application of the method to synthetic data containing steeply dipping events and to a stacked section for a marine 2D line has produced good results. The modifications we have introduced carry a small overhead in computing time but they should enable the method to be used effectively even on sections containing steep dips.
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| 关 键 词： | 地震反射数据 随机噪声 抑制方法 带宽拓展 信号 信噪比 |
| 收稿时间： | 2006-12-05 |
| 修稿时间： | 2006-12-052007-01-23 |
Suppressing random noise to broaden the useful bandwidth of seismic reflection data |
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| Xuewei Liu,Limin Gou. Suppressing random noise to broaden the useful bandwidth of seismic reflection data[J]. Applied Geophysics, 2007, 4(1): 37-44. DOI: 10.1007/s11770-007-0006-y |
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| Authors: | Xuewei Liu Limin Gou |
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| Affiliation: | (1) Department of Applied Geophysics, China University of Geosciences, Beijing, 100083, China |
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| Abstract: | The signal-to-noise ratio (SNR) of seismic reflection data in many areas is rather poor and conventional two-dimensional filters designed to suppress noise with different moveout from the signal tend to generate artifacts. We have extended a method of multichannel filtering, based on the hypothesis that signals on adjacent channels are similar, for enhancing the SNR on stacked sections. Using only the mid-range frequencies where the SNR is highest, the event trend is found for overlapping windows on the section and the average signal vector is calculated. Then the data from the full bandwidth section are projected onto the spatially varying unit similarity vectors and the results are merged for the overlapping windows. Application of the method to synthetic data containing steeply dipping events and to a stacked section for a marine 2D line has produced good results. The modifications we have introduced carry a small overhead in computing time but they should enable the method to be used effectively even on sections containing steep dips. |
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| Keywords: | noise suppressing signal SNR bandwidth broadening. |
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