基于QT的能量比法地震波初至拾取系统设计

Energy ratio method seismic wave first break picking-up system designing based on QT developing platform

利用能量比法拾取地震波初至的基本思路为:在初至到来之前地震波的振幅很小,而在初至到来之后,其振幅增加到很大,因此在初至附近的两时窗内的能量比值会很大,只要找到地震道上能量比的最大值点,此点对应的时间即为初至时间。本文在Linux工作环境下,以QT为开发平台,利用能量比法实现了SEG-Y格式地震文件的读取,并以共炮点、共接收点和共炮检距的方式对初至时间进行交互式自动采集与检验校正,提高了初至拾取的效率和精度。

The basic idea for picking up first break by energy ratio method is described as below:the seismic amplitude is very small before the first break,while it is increased to a big value after the first break,therefore the energy ratio between two time windows near the first break will be a very big value which should correspond to the first break time of the seismic trace.In this paper under Linux working environment and utilizing QT as developing platform,application of the energy ratio method realized the access to SEG-Y format seismic files,the first break times were automatically and interactively picked up,checked and correlated in common shot point gathers,common receiver point gathers and common offset gathers respectively,the efficiency and accuracy for seismic first break picking up were raised greatly.