地震道瞬时强度比法拾取初至波

Seismic first arrival pickup using instantaneous intensity ratio

本文结合地震记录时窗属性和瞬时属性特征,提出了一种改进算法-基于时窗的瞬时强度比法.该方法的基本原理是通过复数道分析来提取地震记录的瞬时属性,采用强度比来判断初至时间.研究表明,滑动时窗能量比法的处理效果较差,在拾取过程中对某些特殊点的处理上存在误差较大;而采用瞬时强度比法后,初至曲线的同向轴变得更加光滑,拾取异常点的情况大为减少,从而有效的提高拾取的精度.

According to seismic attributes of time windows and instantaneous moments,an improved algorithm based on the window of the instantaneous intensity ratio is proposed.The basic theory is that instantaneous attributes are computed with complex trace analysis and first arrival with the intensity ratio method.The results show that the effect of rolling time windows is poor and larger errors exist in the process of picking some special points.When using the instantaneous intensity ratio method,the event of first arrival curve becomes more smooth,and abnormal points have greatly reduced,thus the accuracy of picking is greatly enhanced.