基于共成像点道集评价的偏移速度建模  

Migration velocity modeling based on evaluation of CIP (common imaging point) gathers

作　　者：陈辉[1,2] 李录明[2] 孙雷鸣 罗省贤 

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,四川成都610059 [2]成都理工大学沉积地质研究院,四川成都610059 [3]中海石油能源发展特普地球物理分公司,广东湛江524057

出　　处：《石油地球物理勘探》2010年第4期485-490,624+464,共6页Oil Geophysical Prospecting

基　　金：国家发改委重点项目(发改办高技[2005]2372号);教育部高校博士点基金项目(20070616004);数学地质四川省高校重点实验室基金资助

摘　　要：偏移速度建模的准确性直接影响叠前深度偏移成果的质量。本文以叠前深度偏移为基础,采用批量计算并结合计算机可视化交互方法做层速度分析。交互分析中能实时评判每个速度点的正确性,并根据剩余曲率准则进行动态调整。为了避免单点分析的不足和炮域多射线路径问题的不确定性,利用从交互分析得到的偏移速度进行真振幅叠前深度偏移,抽取共成像点道集,以此评价交互分析的质量,为波动方程叠前深度偏移提供合理、可靠的偏移速度模型。鉴于偏移速度分析的巨大计算量问题,采用多层次并行计算可达到较高效率,更具实用性。实际地震数据处理结果验证了本文偏移速度建模方法的可行性和有效性。The accuracy of migration velocity modeling directly affects the quality of pre-stack depth migration.Based on pre-stack depth migration,the batch computing and visualization method were used to conduct interval velocity analysis.In interactive analysis the accuracy of every velocity point can be evaluated in real time,and can be adjusted dynamically based on residual curvature criterion.In order to avoid shortage of single point analysis and uncertainty of shot domain multi-ray path problem,the migration velocity picked up from interactive analysis were used to conduct true amplitude pre-stack depth migration,by sorting common imaging point gathers,the quality of interactive analysis was evaluated,so the reasonable and reliable migration model was provided for wave equation pre-stack depth migration.For huge calculation in migration velocity analysis,the multi-layer parallel computing can achieve higher efficiency,and it is more practical.Field seismic data processing results verified feasibility and effectiveness of the migration velocity modeling method introduced in this paper.

关 键 词：叠前深度偏移 交互速度分析 偏移速度建模 共成像点道集 多层次并行计算 剩余曲率分析 深度聚焦分析 

分 类 号：P631.443[天文地球—地质矿产勘探]