三维叠前深度偏移速度模型建立方法

Velocity model construction methods for 3-D prestack depth migration

成都理工学院,成都 610059

Chengdu College of Technology, Chengdu 610059

在众多的地震资料偏移成像方法中, 三维叠前深度偏移是归位最精确的偏移方法, 而速度模型则是直接影响偏移质量及效果的关键因素, 针对三维叠前深度偏程处理．本文提出一套三推叠前深度偏移速度模型建立方法, 该方法以叠前深度偏移为基础进行偏移速度和层速度分析, 对速度模型的层位结构及速度纵、横向变化, 采用三维可视化监控和交互方式修改, 可有效地建立三维速度模型, 为三维叠前深度偏移提供高精度的三维速度场, 经实际三维资料处理证明具有良好的应用效果。

In various seismic data migration and imaging methods, 3-D prestack depth migration isthe mtist precise homing method, in which the velocity model is 1he key factor of affecting the qualityand result of migration and imaging. This paper gives a set of migration velocity model cnnstructionmethods. For the layer structure of velocity model and spatial change of velocity field, 3-D visualizalionand interactivenoo are deployed as monitoring and modifying means.The methods can provide high-precision 3-D velocity field for prestack depth migration. Actual 3-D data processing results prove its ef-fectiveness.