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叠前深度偏移速度分析是地震数据处理方法研究的重点,是影响地震成像效果的关键技术之一。对于地表起伏、地下构造复杂的双复杂地区,常规的叠前偏移速度分析方法是将起伏面校正到固定基准面上或进行表层建模再进行偏移与速度分析。本文提出的基于起伏地表的层析速度反演方法从起伏地表直接进行速度场的更新,可以提高层析速度反演的精度与效率。首先介绍基于起伏地表的角度域共成像点道集的提取方法,以此为基础阐述了起伏地表层析速度反演方法。起伏地表模型和实际资料试算验证了本文方法的有效性。
Prestack depth migration velocity analysis is the focus of seismic data processing methods and is one of the key technologies that affect seismic imaging effects. For the dual complex areas with fluctuating surface and complex subsurface structures, the conventional method for prestack migration velocity analysis is to calibrate the relief surface to a fixed datum surface or to model the surface and then perform migration and velocity analysis. In this paper, the surface velocity-based tomographic inversion method based on undulating surface is used to directly update the velocity field from the undulating surface, which can improve the accuracy and efficiency of tomographic velocity inversion. Firstly, the extraction method of common imaging point gathers based on the undulating surface is introduced. Based on this, the method of inversion of undulating surface tomography velocity is introduced. The undulating surface model and actual data trial verify the effectiveness of the proposed method.