Reverse Time Migration (RTM) Surface Offset Gathers (SOGs) are demonstrated to deliver more superior residual dip information than ray-based approaches. It appears more powerful in complex geological settings, such as salt areas. Still, the computational cost of constructing RTM SOGs is a big challenge in applying it to 3D field data. To tackle this challenge, we propose a novel method using dips of local events as a guide for RTM gather interpolation. The residual-dip information of the SOGs is created by connecting local events from depth-domain to time-domain via ray tracing. The proposed method is validated by a synthetic experiment and a field example. It mitigates the computational cost by an order of magnitude while producing comparable results as fully computed RTM SOGs.

与基于射线的方法相比，反向时间迁移（RTM）表面偏移聚集（SOG）具有更好的残留倾角信息。在复杂的地质环境（例如盐地区）中，它似乎更强大。尽管如此，构建RTM SOG的计算成本仍然是将其应用于3D现场数据的巨大挑战。为了解决这一挑战，我们提出了一种使用局部事件骤降作为RTM聚集插值的指南的新颖方法。SOG的残差信息是通过光线跟踪将局部事件从深度域连接到时域来创建的。通过综合实验和现场实例验证了所提方法的有效性。它可将计算成本降低一个数量级，同时产生与完全计算的RTM SOG相当的结果。