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Velocity gradient measurement from time migration analysisNormal access

Authors: A. L. Downie and M. O. Marcoux
Event name: EAGE/SEG Research Workshop 1990
Session: Estimation of Velocities (P&S) from Surface Seismic; Data Analysis; Methods and Limitations
Publication date: 15 July 1990
DOI: 10.3997/2214-4609.201411855
Organisations: SEG, EAGE
Language: English
Info: Extended abstract, PDF ( 1.37Mb )
Price: € 20

Time migration velocity analysis is discussed for velocity gradients of sufficient magnitude to require nonhyperbolic diffraction time surface definition. Since multiparameter semblance analysis is costly and can be ambiguous, we developed a method of common-offset time migration that uses linear gradient theory to control the expansion coefficients defining the diffraction surface. Synthetic and field data are used to demonstrate our approach to migration parameter analysis and time imaging.

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