【摘要】 地震资料初至波拾取是静校正处理中基础且繁重的工作,初至波自动拾取的方法研究具有重要的意义.本文介绍一种空变时窗约束地震波初至拾取的方法.该方法对共炮集记录排序,使排序后炮集中前后炮位置最近,根据坐标位置相近的记录初至波形态相似的认识,认为后一炮的初至基本就在以前一炮初至时间为中心的较小时窗内,以此为约束拾取每一炮初至.通过设置时窗大小可以适应不同的地震资料,高信噪比情况下一般设置大时窗,低信噪比情况下一般设置小时窗.实例表明,该方法效果良好,能快速准确地拾取地震波初至,明显提高了初至拾取工作的效率.更多还原

【Abstract】 First break picking on seismic record is a basic and tough work during the static correction,and the research of first arrival auto picking is significant.This paper presents a method that makes space-varied time window as the constrain condition to detect first arrival.According to this method,a sorting in common-shot-gather is required to make sure that the front shot and the back shot of every pair of shots in sequence are the nearest in geography position.Because of the similarity of first break between the front shot and the back one,the first break of the back shot is mainly located in the time window of which the first break of the front one is the center.And this constrained time window is employed to pick first arrival.The time window width should be wide in high SNR condition while narrow in poor SNR condition.The results show that this method can pick up first break quickly and accurately.更多还原