反射槽波绕射偏移成像及应用

反射槽波能够探测煤层中的小构造，但反射槽波信噪比低，探测效果不理想。为改进成像质量，分析了适用于反射槽波的预处理技术，从理论和实际应用两方面，通过三维槽波数值模拟和实际数据处理应用，验证了反射槽波绕射波偏移方法的有效性。结果表明:应用绕射波偏移方法时，需对反射槽波做Hilbert变换，使之适应槽波的特殊情况；绕射偏移时只需要一个速度，槽波速度基本恒定，槽波绕射偏移方法相对地面地震有独特优势。 

Diffraction migration imaging of reflected in-seam waves and its application

The reflected in-seam waves can detect the small structure in the coal seam. At present, the researches on the reflected in-seam waves exploration are less at home and abroad, and the signal-to-noise ratio is low. In order to improve the image quality, the diffraction migration imaging method of reflected in-seam waves was investigated. The preprocessing technologies suitable for reflected in-seam waves were analyzed. Based on three-dimensional numerical simulations and actual data processing, the feasibilities of reflected in-seam waves were demonstrated for both theoretical models and practical applications. The results showed that reflected in-seam waves should do the Hilbert transform when diffraction migration imaging was used. The in-seam wave velocity is approximately constant and the diffraction migration requires only one velocity, constituting the unique advantages of reflected in-seam waves.