中文摘要：

建立基于双平方根算子的保幅叠前深度偏移与地下入射角度的关系,应用单程波双平方根方程的保幅波动方程叠前深度偏移输出角度域共成像点道集及相应的成像结果,为后续的偏移速度分析和振幅分析提供可靠的数据。取代相对耗时的倾斜叠加法,应用基于精确投影的快速插值映射法抽取保幅角度域共成像道集。结果表明：基于双平方根求取偏移距域道集比基于单平方根方程更为方便直观,也更适合于角度域成像;保幅角度域偏移采用的成像条件不仅可以有效地补偿振幅和改善成像结果,而且克服传统炮域单程波保幅偏移中反褶积型成像条件的不稳定性。理论模型数据和实际资料试算结果进一步证明了所提角度域保幅偏移理论和算法的正确性和有效性。

英文摘要：

Amplitude-preserved wave equation prestack depth migration based on double square root equation outputs angle domain common imaging point gathers and the corresponding imaging results,which produces reliable information for the subsequent migration velocity analysis and amplitude analysis.Improved imaging conditions were used in angle domain amplitude-preserved migration and the fast interpolation method was also used to extract the angle gathers.The results show that it not only effectively compensates for amplitude and improves imaging results,but also overcomes the instability of deconvolution-type imaging conditions used in the shot domain amplitude-preserved wave migration.Experiments of synthetic model also give the further evidence of correctness and effectivity of the angle domain amplitude-preserved migration theory and algorithm.