人民长江Issue(21)：25-29,5.
基于互相关成像条件的隧道地震波逆时偏移处理
Reverse time migration based on cross - correlation imaging condition for tunnel seismic reflecting wave prediction
蔡志成 1顾汉明1
作者信息
- 1. 中国地质大学 武汉 地球物理与空间信息学院，湖北 武汉 430074
- 折叠
摘要
Abstract
Most researches on nunerical sinulation of tunnel seisnic reflecting wave prediction focus on forward nodeling of wave field or nigration of one - way wave equation;however reverse tine nigration based on two - way wave equation has better resolution and inaging effects. Reverse tine nigration algorithn is applied to tunnel seisnic reflection wave inaging by establis-hing several geological nodels for fault,weak interlayer and tilted interfaces. Migration inaging is realized by reverse tine exten-sion for wave field based on acoustic wave equation. By the staggered grid finite - difference algorithn and using cross - correla-tion inaging condition to avoid the unwanted artifacts,we realize 2D reverse tine nigration inaging for a tunnel. Nunerical ex-anples show that the eigenvalue is useful in suppressing artifacts in reflected wave and the nore accurate inage can be obtained by cross - correlation inaging condition,conpared with excitation tine inaging. In tunnel advanced geological forecast,reverse tine nigration based on staggered grid finite - difference algorithn can produce fine inages for geological interface.关键词
地质超前预报/逆时偏移/成像条件/隧道Key words
advanced geological prediction/reverse tine nigration/inaging condition/tunnel分类
天文与地球科学引用本文复制引用
蔡志成,顾汉明..基于互相关成像条件的隧道地震波逆时偏移处理[J].人民长江,2014,(21):25-29,5.
