前言零速度层是Higginbotham等人(1985)为提高有限差分深度偏移的最大倾角成像能力而引入的。Beasley和Lynn(1992)也采用了这一思想,并利用有限差分深度偏移来改善从地形起伏地区采集的地震数据的成像效果。Beasley和Lynn的这一应用,使常规处理方法得到很大的改进,常规处理方法是将地震数据从采集面时移到水平基准面,然后再在地表之上用近地表速度、地表之下用地震速度的最佳估计值进行偏移。常规处理过程通常都会在剖面浅层产生 INTRODUCTION The zero velocity layer was introduced by Higginbotham et al. (1985) to maximize the maximum tilt imaging capability of finite difference depth migration. Beasley and Lynn (1992) also adopted this idea and used finite difference depth migration to improve the imaging of seismic data acquired from undulating terrain. This application by Beasley and Lynn resulted in significant improvements in conventional processing methods by moving seismic data from the acquisition surface to a horizontal datum and then using near-surface velocities above the surface, below the surface The best estimates of seismic velocities are offset. Conventional treatment usually occurs in shallow sections