优势频率约束下的递推f-x去噪和谱均衡方法

Recursive noise elimination in f-x domain and spectrum equalization under dominant frequency restriction

在高分辨率地震资料处理中，提高信噪比的关键是消除高频噪声的影响。为此，本文提出了在优势频率约束下的速推f-X去噪和谱均衡处理方法。该去噪方法是以优势频率成分（即具有最高信噪比的频率成分）的预测因子为约束条件，在给足的频段内分别沿频率减小和增大的方向进行速推求解，准确地求取其它较低信噪比频率成分的预测因子，使低信噪比频率成分的去噪结果更为理想。优势频率约束下的谱均衡方法是以优势频率的振幅值为基础，对窗口内的地震数据进行谱均衡处理，保持了地震数据的相对振幅关系不变，同时提高了地震子波的视主频。

The key to improving signal/noise ratio in high-resolution seismic data pro-cessing lies in eliminating the influence of high frequency noises. Thus a newmethod is given of recursive noise elimination in f-x domain and spectrum equaliza-tion under dominant frequency restriction. According to the method, by using therestriction of prediction operator of dominant frequency contents having the highestsignal/noise ratio,people can make recursive solution respectively along the increaseand decrease directions of frequency in the given band to solve for the desirable pre-diction operators of other frequency contents which have low signal/noise ratio,thus achieving satisfactory noise elimination of the contents whose signal/noise ra-tio is low.The spectrum equalization under dominant frequency restriction is based on theamplitudes of dominant frequency contents,and it can achieve the spectrum equal-ization of seismic data in given windows to keep constant the relative amplitude re-lation of seismic data, and to raise the apparent dominant frequency of seismicwavelets.