TI介质偏移速度建模研究  

Migration velocity modeling strategies of TI media

作　　者：杜向东[1] 翁斌[1] 刘军荣[1] 常旭[2] 刘伊克[2] 

机构地区：[1]中国海洋石油总公司中海石油研究中心,北京100027 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地球物理学报》2008年第2期538-545,共8页Chinese Journal of Geophysics

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-203)资助

摘　　要：经过多年的研究发展,各向异性叠前深度偏移算法已经趋于完善.然而,在地震资料处理过程中导致成像结果不理想的主要原因还是由于建立的地层参数场不够精确.当地层参数接近其真实值时,基于波动方程的剩余曲率建模方法由于不受构造的影响,能够在各向异性和横向变速介质中进行速度分析,所以得到了广泛的研究.本文从偏移结果中抽取共成像道集,然后通过交互运用叠前深度偏移和参数更新实现各向异性偏移速度建模.对理论模型和实际资料进行的试算表明,该方法具有较强的适应性,能极大改善VTI介质反射界面成像效果和分辨率.Anisotropic prestack depth migration becomes closer to perfection since after many years of research and development. In seismic processing, however, inaccurate parameters estimation of the media is the main reason for poor imaging quality. When the estimated parameters of VTI media are close to their real values, the residual curvature analysis modeling method of anisotropic migration velocity analysis based on wave equation is applicable to anisotropic and laterally varying media because it is not associated with the complex geological condition. We will obtain a velocity modeling by anisotropic migration velocity analysis with the common imaging gathers extracted from a migration result. Numerical experiments and field data show that this method could improve the quality of migration results and obtain a robust image of VTI.

关 键 词：各向异性 叠前深度偏移 共成像道集 速度模型 

分 类 号：P631[天文地球—地质矿产勘探]