针对RTM成像波形不光滑的问题进行研究，利用简单模型分析了空间、时间采样间隔对成像波形光滑性的影响。结果表明，空间采样间隔对波形光滑性的影响较大，而时间采样间隔的改变并不能改变波形光滑性。利用三次样条插值，在空间上对RTM成像波形进行插值，可以解决波形不光滑问题。通过复杂模型进行验证，也证明了该方法的有效性。同时对RTM成像剖面沿层地震属性（瞬时振幅、瞬时频率、瞬时相位）进行了分析，结果表明波形经过光滑校正后可以提高地震属性的横向空变稳定性。

In this paper,the problem of waveform unsmoothness in RTM imaging is studied,and the influence of spatial and temporal sampling intervals on waveform smoothness is analyzed by using a simple model. The results show that the spatial sampling interval has great influence on the smoothness of waveform,while the change of temporal sampling interval cannot change the smoothness of waveform. The waveform unsmoothness can be solved by interpolating RTM image waveform in space by cubic spline interpolation. The validity of the method is verified by a complex model. At the same time,the seismic properties(instantaneous amplitude,instantaneous frequency and instantaneous phase)along layers of the RTM imaging are analyzed,and the results show that the waveform can improve the lateral spatial variation stability of seismic properties after smooth correction.

P315

中央高校基本科研业务费专项（ZY20180239）、国家自然科学基金项目（41390455）共同资助