视速度分析及应用

ANALYSIS AND APPLICATION OF APPARENT VELOCITIES

地质矿产部第二物探大队

本文就常规速度滤波中遇到的难题提出了一种解决办法——道集变换法。文章对变换道集可以改变反射信号和规则噪音的视速度关系进行了论证,具体分析了信号和规则干扰在几种道集上的视速度特征,由此而提出双向速度滤波的可行性。最后给出一个双向速度滤波的实例,说明双向速度滤波较一次速度滤波优越。

In this paper, a technique for solving the difficult problems appeared in the conventional velocity filtering was presented. It is called " the mapping of the gather". It has be.en proved that the relation between signals and regular noises could be altered by gather mapping. Eaminations of the character of apparent velocities between signals and regular noises of different gathers has beeh made. In line with these, the feasibility of making velocity filtering In reciprocal direc tions was examined. Such a filtering is called Two Pass Velocity Filter ing and is abbreviated as TPVT. Examples demonstrate that the TPVF has some superiorities over the conventional ones.