西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (3): 35-40.DOI: 10.3863/j.issn.1674-5086.2010.03.007

• 地质勘探 • 上一篇    下一篇

基于保幅延拓算子的共成像点道集敏感性分析

陈 辉1a,1b ,贺玉山2 李录明1b 罗省贤1b赵安军3   

  1. 1.成都理工大学:a.“数学地质”四川省高校重点实验室,b.“地球探测与信息技术”教育部重点实验室,四川 成都 610059:2.中国石油大庆钻探工程公司地球物理勘探一公司研究所,黑龙江 大庆 163357;3.中国石油华北油田公司勘探部,河北 任丘 062550
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-06-20 发布日期:2010-06-20

SENSITIVITY ANALYSIS OF COMMON IMAGE GATHERS BASED ON PRESERVED AMPLITUDE CONTINUATION OPERATOR

CHEN Hui1a,1b HE Yu-shan2 LI Lu-ming1b LUO Sheng-xian1bZHAO An-jun3   

  1. 1.Chengdu University of Technology:a.Key Lab of Geomathematics of Sichuan Province,b.MOE Key Lab of Earth-exploration and Information Techniques,Chengdu Sichuan 610059,China;2.Research Institute, No.1 Geophysical Exploration Company,Daqing Drilling and Exploration Engineering Corporation,CNPC,Daqing Heilongjaing 163357,China;3.Department of Exploration,Huabei Oilfield Company,CNPC,Renqiu Hebei 062550,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-06-20 Published:2010-06-20

摘要: 波动方程叠前深度偏移是解决复杂构造成像问题的有效手段。偏移速度分析和AVA/AVO分析都需要在共成像点道集完成,而共成像点道集对偏移速度的敏感性又直接决定了偏移速度分析的可行性,也影响到偏移速度迭代收敛的次数。利用双平方根保幅偏移算子,在波场延拓过程中抽取共成像点道集,保持了振幅的能量特征,有利于AVA/AVO分析。偏移距域和射线参数域共成像点道集对偏移速度较敏感,能够满足偏移速度分析的需要,两者联合应用有利于提高偏移速度分析的精度。

关键词: 保幅延拓算子, 共成像点道集, 波动方程, 叠前深度偏移, 敏感性分析

Abstract: Wave equation prestack depth migration is an effective way to deal with imaging in complex geological structure.Final imaging result is obtained by prestack depth migration,but the migration velocity analysis and AVA / AVO analysis are completed by common imaging point gathers.Common imaging gathers are sensitive to migration velocity which has an effect on the feasibility and the number of iterative convergence of migration velocity analysis.Based on this,the method of extraction of common imaging point gathers during wave field extrapolation by using double square root preserved-amplitude migration operator is presented in the paper.It ensures the energy characteristics of amplitude and is better for AVA/AVO analysis.The sensitivity of common imaging point gathers in offset domain and ray parameter domain to migration velocity can meet the needs and enhance the accuracy of migration velocity analysis.

Key words: preserved amplitude continuation operator, common image gathers, wave equation, prestack depth migration, sensitivity analysis

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