深水崎岖海底对下伏地层反射波特征的影响分析
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摘要
基于深水崎岖海底地区的地震剖面建立崎岖海底地层地震地质模型;基于射线正演模拟及地震波在弹性分界面上的能量分配,分析研究崎岖海底影响下的下伏地层反射界面上的地震波运动学和动力学特征以及对崎岖海底对下伏地层成像精度的影响,分析结果表明,崎岖海底对下伏地层的反射覆盖次数、反射能量以及入射角范围有很大的影响,导致波的动力学特征发生明显变化,尤其海上长排列加剧振幅的横向变化,指出在复杂崎岖海底地区地震勘探必须选择合适的排列长度和覆盖次数才能确保保幅成像处理。
The seismic-geology model is built based on the real model of rough deep sea bottom obtained from the seismic interpretation in this paper.Based on the theory of ray forward modeling and the energy distribution of seismic in the elastic interface,the seismic kinematic and dynamic characters of rough deep sea bottom and the effect on imaging precision of rough deep sea bottom were analyzed.The results show that because of rough deep sea bottom,the fold number,reflected energy and incident angles on the reflection of the layer lateral vary largely,so is the significant change of dynamic features of seismic wave,especially lateral amplitude change due to long array.The work indicates that in complicated rough deep sea bottom area proper array length and fold number are critical for amplitude-preserved image processing.
The seismic-geology model is built based on the real model of rough deep sea bottom obtained from the seismic interpretation in this paper.Based on the theory of ray forward modeling and the energy distribution of seismic in the elastic interface,the seismic kinematic and dynamic characters of rough deep sea bottom and the effect on imaging precision of rough deep sea bottom were analyzed.The results show that because of rough deep sea bottom,the fold number,reflected energy and incident angles on the reflection of the layer lateral vary largely,so is the significant change of dynamic features of seismic wave,especially lateral amplitude change due to long array.The work indicates that in complicated rough deep sea bottom area proper array length and fold number are critical for amplitude-preserved image processing.
引文
[1]陈礼.深水崎岖海底地震资料叠前深度偏移的必要性[J].中国海上油气,2005,17(1):1～5.
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[3]Bleistein N.Hagedoorn told us howto do Kirchhoff migration and inversion[J].The Leading Edge,1999,18(4):918～927.
[4]Davis W,David J.Geophysical i maging of subsalt ge-ology[J].The Leading Edge,1997,16(1):578～594.
[5]王士敏,漆立新,胡鹏飞,等.塔河地区膏盐层对盐下地层地震反射波特征的影响[J].石油地球物理勘探,2004,39(2):177～180.
[6]David M,Davis R.Understanding subsalt illumina-tion through ray-trace modeling.Part I:Si mple2-D models[J].The Leading Edge,2001,20(6):578～594.
[7]漆立新,顾汉明.天山南缘亚肯北地区速度建场因素分析[J].石油地球物理勘探,2007,42(4):407～412.
[2]Ristow D,Ruhl T.Fourier finite-difference migra-tion[J].Geophysics,1994,59:1882～1893.
[3]Bleistein N.Hagedoorn told us howto do Kirchhoff migration and inversion[J].The Leading Edge,1999,18(4):918～927.
[4]Davis W,David J.Geophysical i maging of subsalt ge-ology[J].The Leading Edge,1997,16(1):578～594.
[5]王士敏,漆立新,胡鹏飞,等.塔河地区膏盐层对盐下地层地震反射波特征的影响[J].石油地球物理勘探,2004,39(2):177～180.
[6]David M,Davis R.Understanding subsalt illumina-tion through ray-trace modeling.Part I:Si mple2-D models[J].The Leading Edge,2001,20(6):578～594.
[7]漆立新,顾汉明.天山南缘亚肯北地区速度建场因素分析[J].石油地球物理勘探,2007,42(4):407～412.
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