滑动扫描谐波分析
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摘要
可控震源激发在地震勘探中占有重要的位置,其激发类型也已由以前的单点激发发展到现在的多源激发,而使用滑动扫描技术能够提高多源激发的效率。滑动扫描方法的基本思想是采用多组可控震源实现无等待扫描激发,即一组震源在扫描激发过程尚未完全结束,另一组震源已经开始启动扫描激发。但是滑动扫描激发也不可避免地产生谐波干扰。文中在简单介绍了滑动扫描技术的基础上,分析了谐波畸变的分布特征,讨论了通过合理地设置滑动时间,减少谐波畸变对地震资料品质的影响,可大幅度提高地震作业效率的方法,并用实例进行了说明。
Shooting by vibroseis has important position in seismic exploration. The pattern of shooting by vibroseis has developed from former shooting in single shot-point to current shooting by multi-source. In order to improve the efficiency of multi-source shooting, it should use slide sweeping. The basic idea of slide sweeping is to use multi-group of vibroseis for slide sweeping without waiting, i. e. the other source has begun starting sweeping for shooting when the former source doesn't finish the process of sweeping for shooting, which inevitably produced harmonic interference. On the basis of briefly introduced slide sweeping technique,the paper analyzed the distributing feature of harmonic distortion,discussed the method greatly improving the efficiency of seismic operation by reasonable setting sliding time and reducing the influence of harmonic distortion on seismic data quality and illustrated the results by real cases.
Shooting by vibroseis has important position in seismic exploration. The pattern of shooting by vibroseis has developed from former shooting in single shot-point to current shooting by multi-source. In order to improve the efficiency of multi-source shooting, it should use slide sweeping. The basic idea of slide sweeping is to use multi-group of vibroseis for slide sweeping without waiting, i. e. the other source has begun starting sweeping for shooting when the former source doesn't finish the process of sweeping for shooting, which inevitably produced harmonic interference. On the basis of briefly introduced slide sweeping technique,the paper analyzed the distributing feature of harmonic distortion,discussed the method greatly improving the efficiency of seismic operation by reasonable setting sliding time and reducing the influence of harmonic distortion on seismic data quality and illustrated the results by real cases.
引文
[1] Seriff A J and Kim W H. The effect of harmonic distortion in the use of vibratory surface sources. Geo-physics,1970,35:234-246
[2] Ras P et al. Marine production levels in land 3-D seismic. Presented at the 69th SEG Annual Meeting, 1999
[3] Thacker P. Slip sweep simulation Western Desert. Presented at the 70th SEG Annual Meeting,2000
[2] Ras P et al. Marine production levels in land 3-D seismic. Presented at the 69th SEG Annual Meeting, 1999
[3] Thacker P. Slip sweep simulation Western Desert. Presented at the 70th SEG Annual Meeting,2000
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