为了适应复杂构造地区振幅随偏移距变化(AVO)分析的需要,本文提出了一种基于双平方根波动方程的振幅保真叠前时间偏移方法,该方法适用于速度弱横向变化介质。该方法实现时首先采用数据影射算法计算共中心点道集的偏移距平面波数据体,然后利用带有振幅校正项的非递归相移算法得到偏移距射线参数域共成像点道集和构造成像结果。理论模型和实际数据的实验表明,本文研究的叠前时间偏移方法有助于改善复杂地质构造地区的AVO分析效果。 In order to meet the need of AVO analysis of complex structural regions, an amplitude-fidelity prestack time migration method based on bi-square root wave equation is proposed in this paper. This method is suitable for medium with weak velocity and lateral variation. When the method is implemented, the data projection algorithm is used to calculate the offset plane wave data body of the central point gathers and then the non-recursive phase shift algorithm with the amplitude correction term is used to obtain the common imaging point gathers and structures of offset ray parameters Imaging results. Experiments on theoretical models and real data show that the prestack time migration method in this paper can help to improve the AVO analysis in complex geological formations.