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- W2067286144 abstract "Imaging with prestack time migration has p roven itself to be an e f f e c t i v e method when la te ra l ve loc i ty grad ien t i s w e a k . M i g r a t i o n v e l o c i t y m o d e l s a r e o b t a i n e d b y i t e r a t i n g , t h a t i s , p i c k i n g t h e r e s i d u a l m o v e o u t a f t e r e a c h p a s s . Production implementation of the common o f f s e t m i g r a t i o n o f t e n u t i l i z e s D M O combined with zero o f f s e t migration. Though th i s method of implemenat ion i s very e f f i c i e n t , i t i s l i m i t e d i n i t s f i d e l i t y b y e r r o r s incur red th rough the use o f DMO and , in pa r t i cu la r , cons tan t velocity DMO. Consequently, the p e r c e p t i o n o f t h e r a n g e o f u s e f u l n e s s o f prestack t ime migration has been strongly d e t e r m i n e d b y a n i n e x a c t a l g o r i t h m . I n the p resen ta t ion , we cons ider exac t t ime migra t ion based on ray t rac ing th rough a v e l o c i t y depth model. By using an exact method, i t will be possible to examine the l i m i t s o f u s e f u l n e s s o f t i m e m i g r a t i o n imaging without being compromised by the a l g o r i t h m . O f c o u r s e , w e p r e s u m e t h e ex is tence of a ve loc i ty dep th model as in depth migration. To obtain the required model, we extend the theory given by Downie and Marcoux (Downie et al, 1990) b y c o n n e c t i n g t i m e m i g r a t i o n s t a c k i n g v e l o c i t i e s w i t h a v e l o c i t y d e p t h function along an imageray. This method yie lds smooth mode ls appropr ia te to t ime m i g r a t i o n t h a t a r e u s e f u l f o r i m a g i n g i n depth. The quality of the model i n f o r m a t i o n t h a t c a n b e f o u n d i n t i m e m i g r a t i o n s t a c k i n g v e l o c i t i e s i s demonstrated on the Marmousi synthetic." @default.
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- W2067286144 date "1993-01-01" @default.
- W2067286144 modified "2023-09-26" @default.
- W2067286144 title "Smooth velocity‐depth models from exact time migration" @default.
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- W2067286144 doi "https://doi.org/10.1190/1.1822587" @default.
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