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。
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.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第3期35-40,188,共6页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家发改委重点项目(发改办高技[2005]2372)
教育部高校博士点基金项目(20070616004)
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
preserved amplitude continuation operator
common image gathers
wave equation
prestack depth migration
sensitivity analysis
