转换波自动剩余静校正方法的实用研究

Application of Automatic Residual Static Correction for Converted-Wave (P-SV) Seismic Data

转换波具有与纵波不同的特点 ,因此对地震转换波数据的处理也必然有其不同之处 ,而转换波剩余静校正是其中的主要困难之一。Cary等在 1 993年提出 :在地表一致性假设下 ,在地下构造不很复杂且接收点静校正量很大的情况下 ,剩余静校正量可以近似等于接收点的静校正量。因而 ,可以在共接收点 (CRP)叠加剖面上 ,使模型道与CRP叠加道的相关值达到最大来实现叠加能量最大 ,从而拾取最大相关值所对应的该CRP点的静校正量。文章用此方法对我国的实际地震转换波数据进行系统的试验和实用 ,取得了良好的地质效果 ,通过与常规算法的对比 ,验证了这一算法无论在精确性还是在稳定性上都优于常规算法。

Because of the difference between converted-wave (P-SV) and P-wave, the processing of converted-wave seismic data requires certain special considerations, in which the residual S-wave statics is one of the main problems. Cary and Eaton presented a robust method for obtaining an initial estimate of large, short-wavelength receiver statics. With the assumption that the surface-consistent model applies to P-SV mode-converted data in a structurally no complex area, they come up with the idea that the residual statics is equal approximately to the receiver statics. We showed that stack-power can be maximized with the use of the crosscorrelation of a pilot trace and a CRP stacked trace, it produces much more reliable solutions of the CRP statics than conventional statics algorithms. This algorithm applies to theoretical and field data and provides much more reliable and robust solutions of CRP statics than conventional statics algorithms.