基于保幅延拓算子的共成像点道集敏感性分析  

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

作　　者：陈辉[1,2] 贺玉山 李录明[2] 罗省贤 赵安军 

机构地区：[1]成都理工大学"数学地质"四川省高校重点实验室 [2]成都理工大学"地球探测与信息技术"教育部重点实验室,四川成都610059 [3]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 [4]中国石油华北油田公司勘探部,河北任丘062550

出　　处：《西南石油大学学报（自然科学版）》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)

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.

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 

分 类 号：TE132.1[石油与天然气工程—油气勘探] P631.4[天文地球—地质矿产勘探]