偏移速度分析与偏移成像  

MIGRATION VELOCITY ANALYSIS AND MIGRATION IMAGING RESEARCH

作　　者：叶景艳 姚亚琳 王燕群 李清 

机构地区：[1]华东有色地质勘查局,江苏南京210007 [2]中国石油华北油田公司勘探开发研究院,河北任丘062552

出　　处：《物探与化探》2009年第6期674-677,共4页Geophysical and Geochemical Exploration

基　　金：国家重点基础研究发展计划973项目(2005CB422104)资助

摘　　要：偏移速度分析和偏移成像是地震资料处理的两个重要组成部分。目前时间偏移技术比较成熟,而深度偏移技术也在逐步完善,时间域偏移成像主要推崇叠前时间偏移法。采用沿层叠加速度分析技术可获得层面上准确的叠加速度,并通过倾角校正、叠前时间偏移和CRP反偏移速度分析逐步优化速度,得到一个符合地质规律、准确的均方根速度场;通过深度偏移方法的研究,总结了建立精确偏移速度场的方法,并提出了一种地震资料处理的思路,即基于射线追踪的Kirchhoff偏移和基于波场延拓的波动方程偏移的结合,使偏移速度分析和偏移成像在应用效果和效率上得到了很大的提高。Migration velocity analysis and migration imaging constitute two important parts in seismic data processing. At present, time migration has become mature, and depth migration is getting more and more perfect. The common method for time domain migration imaging is pre-stack time migration. By adopting stacking velocity analysis along the layer, exact layer stacking velocity can be ob- tained. Through dip correction, pre-stack time migration and CRP de-migration velocity analysis, the velocity is optimized step by step, and then a desired RMS velocity field that is up to the geological rule is acquired. In addition, the method for building the accurate migration velocity field is summed up through the study of the depth migration method. A new seismic data processing flow in combination of Kirchhoff arithmetic based on ray tracing and wave equation arithmetic based on wave field extrapolation is presented. As a result, migration velocity analysis and migration imaging are considerably improved.

关 键 词：偏移速度分析 偏移成像 Kirchhoff积分法偏移 波动方程偏移 

分 类 号：P631.4[天文地球—地质矿产勘探]