摘要
三维VSP资料中,各种不同类型的波混杂一起形成复杂的波场.因此,波场分离是三维VSP数据处理关键的第一步.从不同波场的偏振方向和传播方向之差异着手,提出了一种高保真的VSP波场分离方法.首先通过射线追踪和偏振滤波的结合,把复杂波场(分解为简单波场;然后根据简单波场中不同波的传播方向截然相反的特点,进行方向滤波,达到波场分离的目的.实际数据处理表明,与常规波场分离方法相比,本方法大大降低了混波作用以及由此而生的波形畸变.
In 3-D VSP data, different types of waves are mixed forming a complex wavefield. Wavefeild separation theret＇ore is the first step in 3-D VSP data processing. Taking advantages of the difference in polarization and propagation direction of different waves, this paper presented a high fidelity VSP wavefield separation method. Combing ray tracing and polarization filtering, we firstly decompose the complex wavefiled into simple wavefields. Then we use directional filtering to separate the waves traveling in opposite directions. Real data tests showed that the proposed method effectively decrease wave distortion comparing to conventional wavefield separation methods.
出处
《地球物理学进展》
CSCD
北大核心
2012年第4期1557-1564,共8页
Progress in Geophysics
关键词
三维VSP
波场分离
F-K滤波
偏振滤波
3-D VSP, wavefield separation, F-K filtering, polarization filtering
