约束加权克希霍夫法VSP资料反射成像
|
摘要
本文给出了一种VSP资料共炮点道集地震资料反射成像的方法，它是由一种通过射线追踪求格林函数的方法，求出各成像点到各炮点和检波点的射线旅行时、射线振幅和射线路径，然后根据Snell定律找出满足反射定律的炮检对，利用约束加权克希霍夫法进行成像。本方法适应速度的纵向和横向变化，它优于简单的VSP－CDP资料转换成像方法，通过模型和实际资料的成像应用表明，此法不仅成像精度高，而且有利于改善剖面的频率特性。
A new reflection image method for VSP common-shotpoint gather data is rec-ommended here. First, the travel time,amplitudes and path along each seismic raybetween imaging point and shotpoint (or receiving point) are estimated by derivingGreen's function from ray tracing. Then,shotpoint-receiver pairs which meet reflec-tion law are found by using Snell's law. Finally,prestack depth imaging is achievedby using constraint weighted Kirchhoff integral. This method is adaptable to thevertical and lateral variations of velocity,and it is better than usual VSP-CDP dataconversion iruaging method. Modeling and real data imaging results show that themethod is accurate and improves frequency characteristic of seismic section.
A new reflection image method for VSP common-shotpoint gather data is rec-ommended here. First, the travel time,amplitudes and path along each seismic raybetween imaging point and shotpoint (or receiving point) are estimated by derivingGreen's function from ray tracing. Then,shotpoint-receiver pairs which meet reflec-tion law are found by using Snell's law. Finally,prestack depth imaging is achievedby using constraint weighted Kirchhoff integral. This method is adaptable to thevertical and lateral variations of velocity,and it is better than usual VSP-CDP dataconversion iruaging method. Modeling and real data imaging results show that themethod is accurate and improves frequency characteristic of seismic section.
引文
1Robinson E A著,汪贤驯等泽.地球物理数据偏移,石油工业出版社,1985
2Cerveny V, Molotkov I A, Psencik I著,刘福田等泽.地震学中的射线方法,地质出版社,1986
3朱光明编.垂直地震剖面方法,石油工业出版社,1988
4贺振华等.反射地震资料的偏移处理与反演方法,重庆大学出版社,1989
5王守东,吴律.并间地震资料波动方程反演成像.石油地球物理勘探,1996,31(5):624～632
6Wiggings J Wand Levander A R. Migration of multiple offset synthetic VSP data in complex structure.Advance in geophysical data processing,1984,1:269～288
7Chang W F and McMechan G A. Reverse-time migration ofoffset VSP data using the excitation-time imaging condition Geophysics,1986,51(1):67～84
8 Clayton R W and Yedlin M J. f-K migration for multi-offset vertical seismic profile Stanford explo-ration project report, 1980,24:93～102
2Cerveny V, Molotkov I A, Psencik I著,刘福田等泽.地震学中的射线方法,地质出版社,1986
3朱光明编.垂直地震剖面方法,石油工业出版社,1988
4贺振华等.反射地震资料的偏移处理与反演方法,重庆大学出版社,1989
5王守东,吴律.并间地震资料波动方程反演成像.石油地球物理勘探,1996,31(5):624～632
6Wiggings J Wand Levander A R. Migration of multiple offset synthetic VSP data in complex structure.Advance in geophysical data processing,1984,1:269～288
7Chang W F and McMechan G A. Reverse-time migration ofoffset VSP data using the excitation-time imaging condition Geophysics,1986,51(1):67～84
8 Clayton R W and Yedlin M J. f-K migration for multi-offset vertical seismic profile Stanford explo-ration project report, 1980,24:93～102
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心