共聚焦点道集偏移速度建模  

MIGRATION VELOCITY MODELING IN COMMON FOCUS POINT GATHER

作　　者：李振春[1] 穆志平[1] 张建磊[1] 张凯[1] 王延光[2] 陈世军[2] 

机构地区：[1]石油大学地球资源与信息学院,山东东营257061 [2]胜利油田有限公司物探研究院,山东东营257022

出　　处：《物探与化探》2003年第5期403-406,410,共5页Geophysical and Geochemical Exploration

摘　　要：偏移速度建模可在多种道集实现。基于等时原理和差异时移分析,提出了共聚焦点道集偏移速度建模方法。偏移速度的更新是利用约束参数迭代反演实现,模型的参数化主要依据实际情况而定。为适应横向变速,选用了垂直速度梯度参数。模型试算表明:偏移速度相对误差在0.25%范围内,反射层深度误差小于10m。Migration velocity modeling can be implemented in various kinds of gathers. This paper puts forward the migration velocity modeling method in common focus point gathers based on the principle of equal traveltime and the differential timeshift analysis. The updating of the migration velocity is realized by using model parameter constrained iterative inversion. The parameterization of the model can be determined by actual geological structure. A new parameter, i.e., the vertical velocity gradient, is selected to fit the lateral velocity variation. The test of the depressed model proves that the relative error of migration velocity is lower than 0.25%, and the absolute error of reflector depth is lower than 10 meter.

关 键 词：共聚焦点道集偏移 速度建模 等时原理 差异时移分析 模型参数化 约束反演 

分 类 号：P631.4[天文地球—地质矿产勘探]