偏移速度分析与偏移成像
叶景艳1 ,姚亚琳1 ,王燕群1 ,李清2
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
MIGRATION VELOCITY ANALYSIS AND MIGRATION IMAGING RESEARCH
YE Jingyan 1 ,YAO Yalin 1 ,WANG Yanqun 1 ,LI Qing 2
1.Eastern China Mineral Exploration and Development Bureau for Nonferrous Metals, Nanjing 210007,China; 2.Research Institute
of Exploration and Development, Huabei Oilfield Company, Petrochina, Renqiu 062552,China
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。
Abstract :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 obtained. 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.
收稿日期: 2008-05-12
出版日期: 2009-12-10
基金资助: 国家重点基础研究发展计划973项目(2005CB422104)资助
通讯作者:
叶景艳(1972-),男,湖北鄂州人,高级工程师,主要从事地球物理的生产、管理和研究工作,公开发表学术论文数篇。
引用本文:
叶景艳, 姚亚琳, 王燕群, 李清. 偏移速度分析与偏移成像[J]. 物探与化探, 2009, 33(6): 674-677.
YE Jing-Yan, YAO YA-Lin, WANG Yan-Qun, LI Qing. MIGRATION VELOCITY ANALYSIS AND MIGRATION IMAGING RESEARCH. Geophysical and Geochemical Exploration, 2009, 33(6): 674-677.
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