波动方程最优分裂步相移(OSP)偏移方法研究及应用

波动方程叠前深度偏移是复杂构造准确成像的最有效手段，它用可描述波在复杂介质中传播过程的算子来实现波场外推，更适用于复杂介质中波的成像，此外，它还具有保振幅性的优点。波动方程叠前深度偏移的核心问题就是波场外推算子，一般要求算子能适应陡倾角反射的成像和较剧烈的横向速度变化，同时还要有较高的计算效率。介绍了OSP算子的基本原理及特点，并与其他几种偏移方法进行了比较；同时用OSP方法研制的软件在大庆油田进行了实际应用，取得较好的效果，表明该方法具有良好的应用前景。

Study and application of wave equation optimal abruption step phase shift (OSP) migration method

Wave equation pre-stack depth migration is the most effective method for complex structure precise imaging. It uses the operator that can describe the wave propagation process in complex media to realize wave field extrapolation, more applicable for wave imaging in complex media. Besides, it has advantage of vibration amplitude protection. The core of wave equation pre-stack depth migration is the wave field extrapolation operator. Generally this operator is required to match the steep dip reflection imaging and violent horizontal velocity variance, with high computing efficiency at the same time. OSP operation basic principles and features are introduced and comparison with other migration methods is conducted. OSP method developed software has been applied in Daqing Oilfield with good effect, indicating a good application prospect.