一种叠前反射地震记录频变速度分析方法

A frequency dependent pre-stack velocity analysis method

叠前速度是地震勘探数据处理的重要环节和地震解释的重要属性。传统速度分析不考虑地震波速度频散,而频散特性正成为储层地震预测和海底探测越来越重要的属性。基于时频分析技术,提出了一种反射地震记录频变速度分析方法,其可利用地震共深度点道集获得随频率变化的速度。在此基础上利用三种不同的地质模型,开展了模拟地震数据的测试,结果表明本方法可以获得准确的常速度地层速度及合理的地层频变速度,使利用频变速度开展更精确的动校正和储层预测成为可能。

Pre-stack velocity is an important link of seismic data processing and an important attribute of seismic interpretation.The traditional velocity analysis does not concern the velocity dispersion of seismic waves,but the dispersion characteristics is becoming an increasingly important attribute of reservoir seismic prediction and seabed exploration.Based on the timefrequency analysis technique,this paper presented a frequency-varying velocity analysis method for reflection seismic records,in which the frequency-varying velocity can be obtained by using the common depth point collection.On this basis,three different geological models were used to test the simulated seismic data.The results showed that the method presented in this paper can obtain accurate formation velocity of constant velocity and reasonable formation velocity of frequency variable velocity,which makes it possible to use frequency variable velocity to carry out more accurate dynamic correction and reservoir prediction.