用Radon变换法消除沙丘鸣震的应用及效果分析

Application of Radon transformation to elimination of dune ringing and its effect analysis

1. 胜利石油管理局物探研究院,山东东营257022;2. 胜利石油管理局勘探监理部,山东东营257000

1. The Geophysical Institute of Shengli Petroleum Administration, Dongying 257022,China;2. The Exploration Supervision Department of Shengli Petroleum Administration, Dongying257000,China

沙丘鸣震是由于地震波在沙层中多次反射所产生的一种层间多次波,这是在陆上资料处理中经常遇到的现象。它的存在使地震剖面的分辨率降低,并干扰人们对有效波的认识。主要介绍了在Omega地震资料处理系统中用Radon变换消除沙丘鸣震的原理和方法。该方法实质上是一种“减去波”方法:首先在τ-p域中把想要去除的相干干扰信号 (包括多次波)识别并分离出来,然后再转换到t-x域并将它从原始的地震信号中减去。

The dune ringing, which is actually interbed multiples caused by seismic waves travelling in sand beds, is common in land seismic data. Its existence degrades the resolution of seismic data and impedes the identification of significant waves. The paper discusses the methodology of ringing elimination with Radon transformation that used in Omega seismic data processing system. The method is in essence a subtraction one, that is, firstly the undesired signals including multiples are detected and decomposed in τ-p domain, and then they are removed from raw seismic data in t-x domain. The practice on certain working area shows that the method reached desired results.