近地表模型静校正

Static correction using near surface model.

本文讨论了初至波反演模拟实现静校正的新方法。此法以反射地震资料中的观测初至旅行时与模型射线追踪旅行时之差的最小平方法为基础。初始模型来自于先验信息或传统的解释成果。反演过程中利用具先决的最速下降法,可解决覆盖层速度和折射界面深度同时反演问题。该法成功地解决了理论合成记录的模拟,有效地处理了 A 区的野外实际资料静校正问题。

A new static correction using inverse modeling of first break is recommend- ed here.It is based on the least square of the difference between the real reflec- tion first break time and corresponding modeled ray-tracing travel time.The ini- tial model derives from priori informations or traditional interpretation results. The preconditioned fastest descent means in inversion achieves simultaneous in- versions of overlying-bed velocity and refractor depth.This method has been successfully used to yield theoretical seismic data and to perform static correc- tion of the seismic data in A district.