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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。本文的基于角度域共成像点道集剩余曲率的偏移速度分析方法,旨在通过角度域共成像点道集(ADCIGs)来建立局部入射角与偏移深度之间的联系,通过角度道集剩余速度分析来修正、更新偏移速度。不同于偏移距域共成像点道集(ODCIGs),ADCIGs较少地受到由于多路径问题而产生的波场干涉假象的影响,更适合于偏移速度分析。本文在推导出基于ADCIGs的水平地层深度剩余量公式的基础上,提出了基于ADCIGs的沿层扫描法速度更新流程,凹陷模型和实际资料的试处理表明了本方法的正确性和有效性。
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. In this paper, the method of analyzing the migration velocity based on the residual curvatures of common imaging point gathers in the angle domain is designed to establish the relationship between the local incidence angle and the migration depth through the common imaging point gathers (ADCIGs) in the angle domain. Residual speed analysis to correct, update the offset speed. Unlike ODCIGs, ADCIGs are less affected by the artifacts of wavefield interference due to multipath problems and are more suitable for offset velocity analysis. Based on the derivation of ADCIGs-based horizontal formation residuals formula, this paper proposes ADCIGs-based velocity update process along the layer-by-layer method. The experimental results show that the proposed method is correct and effective.