逆时偏移中波形光滑性分析与波形校正研究
|
摘要
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.
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.
引文
Chattopadhyay S,Mc Mechan G A,2008,Imaging conditions for prestack reverse-time migration,Geophysics,73(3),S81~S89.
Claerbout J F,1971,Toward a unified theory of reflector mapping,Geophysics,36(3),467~481.
Costa J C,Silva Neto F A,Alcntara M R M,et al,2009,Obliquity-correction imaging condition for reverse time migration,Geophysics,74(3),S57~S66.
Fletcher R P,Fowler P J,Kitchenside P,et al,2006,Suppressing unwanted internal reflections in prestack reverse-time migration,Geophysics,71(6),E79~E82.
Guitton A,Kaelin B,Biondi B,2007,Least-squares attenuation of reverse-time-migration artifacts,Geophysics,72(1),S19~S23.
Jones I F,2008,A modeling study of preprocessing considerations for reverse-time migration,Geophysics,73(6),T99~T106.
Nguyen B D,Mc Mechan G A,2013,Excitation amplitude imaging condition for prestack reverse-time migration,Geophysics,78(1),S37~S46.
Symes W W,2007,Reverse time migration with optimal checkpointing,Geophysics,72(5),SM213~SM221.
Weibull W W,Arntsen B,2013,Automatic velocity analysis with reverse-time migration,Geophysics,78(4),S179~S192.
Xu S,Zhang Y,Tang B,2011,3D angle gathers from reverse time migration,Geophysics,76(2),S77~S92.
Yang R H,Mao W J,Chang X,2015,An efficient seismic modeling in viscoelastic isotropic media,Geophysics,80(1),T63~T81.
Zhang Y,Sun J C,Gray S H,2003,Aliasing in wavefield extrapolation prestack migration,Geophysics,68(2),629~633.
Claerbout J F,1971,Toward a unified theory of reflector mapping,Geophysics,36(3),467~481.
Costa J C,Silva Neto F A,Alcntara M R M,et al,2009,Obliquity-correction imaging condition for reverse time migration,Geophysics,74(3),S57~S66.
Fletcher R P,Fowler P J,Kitchenside P,et al,2006,Suppressing unwanted internal reflections in prestack reverse-time migration,Geophysics,71(6),E79~E82.
Guitton A,Kaelin B,Biondi B,2007,Least-squares attenuation of reverse-time-migration artifacts,Geophysics,72(1),S19~S23.
Jones I F,2008,A modeling study of preprocessing considerations for reverse-time migration,Geophysics,73(6),T99~T106.
Nguyen B D,Mc Mechan G A,2013,Excitation amplitude imaging condition for prestack reverse-time migration,Geophysics,78(1),S37~S46.
Symes W W,2007,Reverse time migration with optimal checkpointing,Geophysics,72(5),SM213~SM221.
Weibull W W,Arntsen B,2013,Automatic velocity analysis with reverse-time migration,Geophysics,78(4),S179~S192.
Xu S,Zhang Y,Tang B,2011,3D angle gathers from reverse time migration,Geophysics,76(2),S77~S92.
Yang R H,Mao W J,Chang X,2015,An efficient seismic modeling in viscoelastic isotropic media,Geophysics,80(1),T63~T81.
Zhang Y,Sun J C,Gray S H,2003,Aliasing in wavefield extrapolation prestack migration,Geophysics,68(2),629~633.