两步法三维偏移在不同地震道记录的精度研究
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摘要
本文主要针对两步法三维偏移的方法原理以及两步法三维偏移在不同地震道记录的精度进行了研究,得出两步法三维偏移方法是在互相垂直的两组地震测线网中每次在一个方向上进行一次二维偏移,两次偏移的结果近似等价于三维偏移。用这种方法进行三维偏移,相当于二维偏移工作量的两倍,如果用全三维偏移方法中的任何一种都是二维偏移工作量的10倍以上。该方法在不同的地震道记录的精度不同,在记录的中心道上精度最高,随着与中心道距离的增加会发生很大的频散现象,效果不佳。
Through studying on the principle and precision of different seismic trace records in 3D deviation of two-step method, it is arrived at that 3D deviation approximates to the result of 2D deviation happened twice in two vertical groups of seismic line network in one direction each time.The work of 3D deviation in this way is as twice as that of 2D deviation.The work of every full 3D deviation method is as 10 times as that of 2D deviation.The precision of this method varies with different seismic trace records. Spectral dispersion phenomenon will happen as the space of center trace increases, which is undesireble.
Through studying on the principle and precision of different seismic trace records in 3D deviation of two-step method, it is arrived at that 3D deviation approximates to the result of 2D deviation happened twice in two vertical groups of seismic line network in one direction each time.The work of 3D deviation in this way is as twice as that of 2D deviation.The work of every full 3D deviation method is as 10 times as that of 2D deviation.The precision of this method varies with different seismic trace records. Spectral dispersion phenomenon will happen as the space of center trace increases, which is undesireble.
引文
[1]贺振华等,反射地震资料偏移处理与反演方法,重庆大学出版社,1989年5月
[2]李录明、罗省贤,相移加校正叠前深度偏移及偏移速度分析,石油地球物理勘探
[3]李正文、贺振华主编,勘查技术工程学,2002年8月
[4]耿建华等,波动方程有限插分法叠前深度偏移,地球物理学报,1998年03期
[5]方伍宝等,实用化的二维波动方程叠前深度偏移,石油地球物理勘探2004,39(1)
[6]姚姚,地震波场与地震勘探,2006年6月
[7]Gazdag J&Sguazzero P.Migration of seismic data by phase shift plus interplaytion,Geophysics,1984,49(2):124-131
[8]Schneider A.Integral formulation for migration in two and three di-mension,Geophysics,1978,43(1):49-76
[2]李录明、罗省贤,相移加校正叠前深度偏移及偏移速度分析,石油地球物理勘探
[3]李正文、贺振华主编,勘查技术工程学,2002年8月
[4]耿建华等,波动方程有限插分法叠前深度偏移,地球物理学报,1998年03期
[5]方伍宝等,实用化的二维波动方程叠前深度偏移,石油地球物理勘探2004,39(1)
[6]姚姚,地震波场与地震勘探,2006年6月
[7]Gazdag J&Sguazzero P.Migration of seismic data by phase shift plus interplaytion,Geophysics,1984,49(2):124-131
[8]Schneider A.Integral formulation for migration in two and three di-mension,Geophysics,1978,43(1):49-76
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