横向各向同性介质中的弹性波方程逆时偏移及其成像条件  

THE REVERSE-TIME MIGRATION OF ELASTIC WAVE EQUATION AND ITS IMAGING CONDITIONIN TRANSVERSE ISOTROPIC MEDIA

作　　者：李国发[1] 熊金良[1] 何兵寿[1] 

机构地区：[1]石油大学地球科学系,北京102249

出　　处：《物探化探计算技术》2002年第4期289-293,327,共6页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：作者在本文中导出了在横向各向同性介质情况下,二维弹性波逆时传播的高阶差分格式,实现了弹性波在数值空间中的逆时延拓。从snell定理出发,采用插值法求取网格空间中各点的直达波旅行时,以此作为弹性波逆时偏移的成像条件,实现多波多分量资料的逆时偏移。数值试验表明,逆时偏移能够使地表接收到的波场准确归位,提高资料处理的精度。A highorder finite difference scheme for 2D transverse isotropic media is derived in the paper, which can achieve reversetime extrapolation of elastic waves. Based on Snell's law, an approach for calculation firstarrival travel times in a transverse isotropic media is developed, of which result can be used as the imaging condition of reverse time migration. Synthetic data test of the method shows improved images.

关 键 词：横向各向同性 弹性波 逆时偏移 成像条件 地震勘探 地震资料处理 

分 类 号：P631.44[天文地球—地质矿产勘探] P631[天文地球—地质学]