S-变换初至拾取技术及其在复杂山区中的应用

初至的拾取在地震资料处理中有着非常重要的作用,它是折射波资料分析、VSP处理和井间地震资料处理的基础工作,并为其他处理工作提供可靠参数。提出了基于S-变换的初至拾取技术,设计单道模型将S-变换与不同时窗长度的短时窗傅里叶变换以及小波变换进行初至拾取的比较,并对不同信噪比的理论模型进行初至拾取,对比得出该方法具有容噪性好、初至拾取准确、适应性强等特性。该技术应用于复杂山区低信噪比地区实际地震资料处理中,取得较好的效果。

Application of First-break Picking Technology of S-transformation in Complex Mountainous Areas

First break picking plays an important role in seismic data processing,which is an essential work for refraction data analysis,VSP processing and cross-well seismic data processing,and provides reliable parameters for other processing.First break picking technology is put forward based on S-transform.The single trace model is designed and first break picking technology is compared with S-transform,the different time window lengths STFT and wavelet transform.First break picking is carried out on the model with different S/N ratios.The results show that the method has a good anti-noise character,exact first break times and powerful adaptability.The first break picking technology is used for processing the low S/N ratios seismic data in the complex mountainous area and good effect is achieves.