收稿日期: 2005-12-19
修回日期: 2006-02-07
网络出版日期: 2006-04-20
MODEL-RESTRICTED FREQUENCY-DIVISION LOCAL NOISE ATTENUATION
Received date: 2005-12-19
Revised date: 2006-02-07
Online published: 2006-04-20
李琳,邓央 . 模型约束分频局域去噪方法及应用[J]. 天然气地球科学, 2006 , 17(2) : 282 -284 . DOI: 10.11764/j.issn.1672-1926.2006.02.282
Seismic data in complex area contains varieties of abundant disturbing waves tha t badly affect the imaging of the data. Now, the best way for noise attenuation is to introduce different noise attenuation methods to diverse disturbing wave, among which the subtraction has more thorough-paced result.Band-filters are c ommonly used in full frequency domain to eliminate regular noise in conventional processing. But the frequency of the reflection waves and the noise are overlap ped. So the reflection waves would be damaged inevitably. Such process will lea d to the loss of the low frequency divisions. The method introduced in this pap er introduces frequency division theory in data processing. It divides the seism ic signal into several sections of different frequency divisions, and only proce sses the section that has affluence noise with model-restrained subtraction noi se attenuation method. Thus not only can it wipe completely out the noise, but preserve the reflection waves, and sequentially improves the ratio of signal-t o-noise. The examples show that the method is practicable and effective.
Key words: Model-restricted; Frequency-division; Noise attenuation.
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