A theoretical comparison of equivalent‐offset migration and dip moveout‐prestack imaging

Autor:	J. Bee Bednar
Rok vydání:	1999
Předmět:	Geophysics Optics Offset (computer science) Geochemistry and Petrology Velocity estimation business.industry Normal moveout Geometry Prestack business Geology
Zdroj:	GEOPHYSICS. 64:191-196
ISSN:	1942-2156 0016-8033
DOI:	10.1190/1.1444515
Popis:	Equivalent‐offset migration is a methodology for prestack‐Kirchhoff time migration that partially reverses the order of velocity analysis, normal moveout correction, stack, and migration. Though claimed to be computationally and analytically superior to earlier time‐domain approaches, it is not independent of velocity. Velocity‐independent dip moveout followed by prestack imaging is similar to equivalent‐offset migration in that it also postpones normal moveout correction to the postmigration stage, but it is independent of velocity. This paper investigates the theoretical relationship between these two processes, showing that equivalent‐offset migration and prestack imaging are asymptotically equivalent. Moreover, equivalent‐offset migration has little, if any, computational or analytic advantage. The fact that the combination of dip moveout followed by prestack imaging is independent of velocity is a major advantage and suggests that this latter method is better suited to problems of velocity estimation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7e5f37887c3d344ac0b0f3fb0a588605 https://doi.org/10.1190/1.1444515 Zobrazit plný text záznamu