【摘要】 叠前深度偏移是油气勘探领域解决复杂地震构造成像问题的主要手段。这里介绍一种基于射线参数估计的快速2D Kirchhoff叠前深度偏移方法。该方法根据炮点和接收点的相对位置,对入射波的射线参数进行先验约束,辅以设定振幅阈值,仅对主要反射事件进行偏移等,显著减小了射线追踪计算,较传统Kirchhoff叠前深度偏移显著提高了偏移成像效率。数值模拟计算结果表明,该算法能正确对复杂构造进行快速成像。这里介绍的快速Kirchhoff叠前深度偏移方法,可用于野外现场质量监控与精确偏移成像前的速度分析与建模。更多还原

【Abstract】 Pre-stack depth migration is the one of the most important technique for the imaging of the complex subsurface structure.The paper presents a high-efficiency 2D Kirchhoff pre-stack depth migration technique based on ray parameter estimation.By setting constraint on the ray parameters of the incident waves and setting threshold on the reflection events to take into count,the algorithm reduces markedly the ray tracing calculation cost.Numerical tests show that the algorithm is of capability of rapid imaging of complex subsurface structure and can been used in the field real-time imaging and fast velocity analysis.更多还原