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基于拟线性Born近似的叠前深度偏移方法
引用本文:陈生昌,曹景忠,马在田.基于拟线性Born近似的叠前深度偏移方法[J].地球物理学报,2001,44(5):704-710.
作者姓名:陈生昌  曹景忠  马在田
作者单位:同济大学海洋地质重点实验室,上海200092
基金项目:国家自然科学基金委与大庆石油管理局联合资助项目 (4 98941 90 -2 4)
摘    要:在频率波数域和频率空间域实现了一种基于拟线性Born近似的叠前深度偏移方法,并在2-D空间进行了Marmousi模型炮集数据的处理.通过与Split-StepFourier、Phase-Screen和稳定的Born近似叠前深度偏移等方法比较,认为基于拟线性Born近似的叠前深度偏移方法不仅在效果上要优于前三者,而且还能更好地处理速度横向变化.在散射波场计算中,使用了一个更稳定的散射波场计算公式,扩大了拟线性Born近似的应用范围,使基于拟线性Born近似的叠前深度偏移方法能够适应更强的横向速度变化.

关 键 词:Green函数  拟线性Born近似  散射波场  叠前深度偏移  
文章编号:0001-5733(2001)05-0704-07
收稿时间:2000-11-20

PRESTACK DEPTH MIGRATION METHOD BASED ON QUASI-LINEAR BORN APPROXIMATION
CHEN SHENG-CHANG,CAO JING-ZHONG,MA ZAI-TIAN.PRESTACK DEPTH MIGRATION METHOD BASED ON QUASI-LINEAR BORN APPROXIMATION[J].Chinese Journal of Geophysics,2001,44(5):704-710.
Authors:CHEN SHENG-CHANG  CAO JING-ZHONG  MA ZAI-TIAN
Institution:Laboratory of Marine Geology, MOE, Tongji University, Shanghai 200092, China
Abstract:In this paper, a prestack depth migration method based on quasi-linear Born approximation is carried out in frequency-wavenumber domain and frequency-space domain, and is used to process common shot gather data of Marmousi model. Comparison of this method with Split-Step Fourier migration method, Phase-Screen migration method shows that the prestack depth migration method can not only produce better migration result than previous three methods, but also can be used to handle lateral velocity variation in better way. During calculation of scattered wavefield, we use a formula for scattered wavefield more stable than that used by Huang et al. It enlarges the range of quasi-linear Born approximation, and makes the prestack depth migration method based on quasi-linear Born approximation to be able to adapt strong lateral velocity variation.
Keywords:ZK(Green function  Quasi-linear Born approximation  Scattered wavefield  Prestack depth migration  
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