An Application of T-X Domain Dip Filter in Extracting Water Bottom Multiples

時空領域濾波器在消除海底復反射方面之應用

黃昌盛(Chang-Sheng Huang) ； 陳俊逸(Jiunn-Yih Chen) ； 顧駿偉(Juin-Wei Ku) ； 楊育良(Yu-Lang Yang)

《Terrestrial, Atmospheric and Oceanic Sciences》 1卷2期 (1990/06) Pp. 193-206

摘要

海底複反射之消除一直是震測處理過程中令人困擾的問題。海底複反射之存在，不僅干擾了地層的反射訊號，在移位處理時，也會因為速度因素，導致過度移位的現象。為此我們提出一種簡易的海底複反射消除方法。本方法主要是利用剩餘移位方法，再配合時空領域(T-X)傾角濾波器，將震測剖面上可以辨認出的海底複反射摘取消除之。尤其在海底地形崎嶇地區，本方法較其他傳統複反射摘除方法更能有效地消除海底複反射。
本方法不僅對一般海底複反射的摘除有效，對於剖面上其他多餘能量亦能有效地加以去除，但由於摘取之過程是在重合後之剖面進行，且複反射之選取亦較為主觀，所以在應用本方法時必須十分小心謹慎。只要在應用時小心地選用適宜的參數，剖面的品質必可獲得相當的提升。

並列摘要

Multiple elimination is one of the important topics in the field of seismic data processing. Since the water bottom multiples usually interfere with the primary reflections and induce overmigration during the migration stage, we propose one simple and easy method to extract the first order water bottom multiple. This method is an extended application of the time space (T-X) domain dip filter combined with the residual migration. In the area with rugged water bottom, this method is more effective, than conventional multiple suppression methods, for the suppression of multiples.
It erases the water bottom multiples from the record, but also any undesired energy. Since this mehod is applied in the post-stack stage and the recognization of the multiple is subjective, so the application of this method should be made very carefully. When parameters are properly chosen, the application of this method can make an noticeable improvement in the final results.