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把倾斜界面反射时间校正到相应的平界面反射时间的过程就叫做DMO。DMO法目前普遍受到人们的重视,因为它比叠前偏移节省机时,而且在复杂地区有可能获得相当于叠前偏移的地质效果。DMO的实现方法有时间域运算与频率域运算的区别,时间域运算中又有积分法与差分法的不同。本文通过理论分析和具体处理步骤的对比,说明了时间域积分法DMO运算简便易行,应用灵活,而且运算量少。如果能灵活掌握好时变、空变的倾角γ(T_0,x)则可能使积分法DMO运算时间大幅度地减少。
The process of correcting the tilted interface reflection time to the corresponding flat interface reflection time is called DMO. At present, the DMO method is widely regarded by people because it saves machine time compared with prestack migration, and it is possible to obtain the geological effect equivalent to prestack migration in complicated areas. The method of DMO has the difference between the time domain operation and the frequency domain operation, and there are also the difference between integral method and difference method in the time domain operation. In this paper, the theoretical analysis and comparison of specific processing steps show that the DMO method of time domain integration method is simple and easy to operate with flexible application and less computation. If we can grasp the time-varying flexibly, the vacant inclination γ (T_0, x) may greatly reduce the integration DMO operation time.