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倾角时差校正（ＤＭＯ）方法对于复杂地质构造条件下的纵波反射波（Ｐ－Ｐ）的多次覆盖地震数据的叠加具有显著的提高信噪比的效果．对于转换反射波（Ｐ－ＳＶ）来说，进行倾角时差校正（ＤＭＯ）处理就更需要．本文首先对Ｐ－ＳＶ波的倾角时差校正（ＤＭＯ）的几何原理进行了分析，然后重点研究用波动方程进行ＤＭＯ的方法，即Ｐ－ＳＶ转换反射波的叠前部分偏移的波动方程法．这种方法也适用于Ｐ－Ｐ反射波的叠前部分偏移处理．研究结果表明，波动方程ＤＭＯ方法在振幅保真方面比几何原理的ＤＭＯ方法有显著改善．
The dip angle time difference correction (DMO) method has significant effect of improving signal-to-noise ratio (SNR) for multiple overlay seismic data superimposed by P-P under complex geological conditions. For converted reflected waves (P-SVs), a dip time difference correction (DMO) process is even more desirable. In this paper, we firstly analyze the geometrical principle of P-SV wave dip-angle time-difference correction (DMO), and then focus on the method of DMO using wave equation, that is, the wave equation method of prestack partial migration of P-SV converted reflected wave. This method is also applicable to the P-P reflected wave pre-stack offset processing. The results show that the DMO method of wave equation has a significant improvement in amplitude fidelity over the geometric principle DMO method.