沿层定点速度分析技术

Along-layer fixedpoint velocity analysis technique

建立速度分布模型是叠前深度偏移方法中的关键技术。本大综述了这一技术的发展现状；阐明了通过叠前深度偏移建立速度模型和在叠前深度偏移中应用速度模型的基本概念；探讨了剩余速度分析中的陷阱；实现了沿层定点实时交互建立速度分布模型的功能。文章最后以实际数据为例，展示了该技术的运算效率和应用效果。

The establishment of velocity distribution model is a decisive technique inprestack depth migration. This paper presents the current situation of the techniqueand clarifies the fundamental concepts of deriving a velocity model from prestackdepth migration and of applying the velocity model to prestack depth migration. Italso discusses the pitfall in residual velocity analysis and realizes the function of along--layer fixed--point real--time interactive establishment of velocity distributionmodel. This paper also takes actual data as example to show the efficiency and application results of this technique.