复杂山前带具有地表起伏大、地下逆掩推覆构造倾角大、地层反转重叠、断层关系复杂等地质特征。在地震资料上主要表现为:信噪比低,纵横向速度变化大,高精度速度建模困难,常规的地震成像方法不适用。为此,有针对性的采用下列技术:约束速度反演(CVI)进行初始层速度模型建立,有效解决速度场不稳定的问题;通过三维层析成像+井约束速度建模技术,建立准确的速度模型;采用炮域波动方程叠前深度偏移技术进行全孔径偏移,解决复杂山前带构造成像问题。 The complex piedmont belt has such geological features as large surface undulation, overthrust nappe overtopping, overlying strata inversion, complex fault relations and so on. The seismic data mainly show as follows: the signal-to-noise ratio is low, the vertical and horizontal velocity changes greatly, and the modeling of high-precision velocity is difficult. The conventional seismic imaging method is not suitable. For this reason, the following technologies are targeted: Constraint velocity inversion (CVI) is used to establish the initial layer velocity model, which can effectively solve the problem of instability of velocity field. By using 3D tomography + well constrained velocity modeling technique, Velocity model; using the artillery wave equation prestack depth migration technology for full aperture migration, to solve the problem of complex piedmont structure imaging.