Bridging the gap between ray‐based tomography and wave‐equation migration image gathers

Jousselin, P.; Duquet, Bertrand; Audebert, F.; Sirgue, J.

doi:10.1190/1.3255700

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2011

2021

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Cited by 9 publications

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“…Migration velocity analysis from angle domain CIGs appears then particularly promising for velocity model building in complex area. There is a general agreement that with Kirchhoff or RTM angle domain CIGs (Jousselin et al, 2009;Huang et al, 2010):…”

Section: Introductionsupporting

confidence: 57%

RTM and Kirchhoff Angle Domain Common-image Gathers for Migration Velocity Analysis

Montel¹,

Lambaré²

2011

73rd EAGE Conference and Exhibition Incorporating SPE EUROPEC 2011

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Angle domain common image gathers are recommended in Kirchhoff and reverse time migration for velocity model building in complex area. For these both approaches there is a general agreement that the tomographic ray pairs are fully defined by the reflection and azimuth angle information and the reflection dip and that if the velocity model is correctly updated down to a given horizon, it is not necessary to shoot the tomographic ray pairs upwards through this horizon. We show here through examples and a theoretical analysis that these both statements have to be mitigated when the common image gathers exhibit a significant residual move out on. We also show how to accurately compute the tomographic ray pairs allowing then for an accurate angle domain migration velocity analysis.

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Section: Introductionsupporting

confidence: 57%