摘要
常速叠加是根据给定的速度将炮检距空间的地震数据映射到叠加速度空间，在实际叠加速度位置形成叠加能量；速度变换是将叠加速度空间的能量数据映射到均方根速度空间，消除地层倾角对速度的影响，这实际上是一种ＤＭＯ方法；常速偏移是在每个均方根速度剖面上独立地进行波场归位，消除反射点位置对速度的影响．经过这三步处理获得最终叠前偏移结果．
The constant-velocity stack maps the seismic data from the t-h domian(where t is the reflection time and h is the offset)to the t0-vs domain(where t0 is the zero-offset reflection time and vs is the stack velocity)and results in stack energyconcentrated at the real stack velocity.The constant-velocity DMO maps the datafrom the t0-vs domain to the t0-v domain(where v is the rms velocity)and yields dip-independent velocity.The constant-velocity poststack migration maps the datafrom the t0-v domain to the τ-v domain(where τ is the vertical reflection time)and images the reflector at its real position.Through the above-mentioned three steps,the equivalent prestack migration can be formed for interpreting the geological structure more accurately.
出处
《地球物理学报》
SCIE
EI
CSCD
北大核心
1994年第6期795-803,共9页
Chinese Journal of Geophysics
关键词
等效叠前偏移
常速叠加
地震数据
Constant-velocity prestack migration,Equivalent prestack migration,Constant-velocity stack,Constant-velocity DMO,Constantvelocity poststack migration.
