波动方程叠前深度偏移技术在苏北C工区的应用

目前解决复杂构造与速度横向变化剧烈地区地震偏移成像的最佳方法之一是波动方程叠前深度偏移技术。针对苏北地区地下构造复杂、断层多、断块小、地下速度横向变化大的特点，提出以偏移速度分析和建立正确的深度域速度模型为核心的适合于苏北C工区的叠前深度偏移处理方法。阐述了初始速度的建立、模型修正的过程及原则，通过分析苏北C工区地震资料叠前偏移处理结果，说明了波动方程叠前偏移技术的应用效果。

Application of wave equation prestack depth migration in C survey area

The optimal method for imaging complex structures in arc-a of rapid velocity variations is wave equation prestack depth migration. The geology in north of Jiangsu Province characterizes complex subsurface structures, enriched faults, minor faulted blocks, and rapid velocity variations. In this paper, we proposed to create a workflow based on migration velocity analysis and depth velocity model building to process the data from C survey area in north of Jiangsu Province. We discussed the building of initial velocity model and the procedure and principles of velocity update. The method was demonstrated by real data processing.