SOME KINEMATIC PROBLEMS FOR LAYERED MEDIA WITH SHALLOW VELOCITY ANOMALIES
E.A. Blias
75-100 Signature Way, SW, Calgary, Alberta, T3H 2X9, Canada
Keywords: Reflection traveltimes, NMO velocity, traveltime inversion, shallow velocity anomalies, Dix-type inversion
Pages: 587-603
Abstract
The paper addresses traveltime processing for 2D models with laterally inhomogeneous layers and curved interfaces in shallow subsurface. Analytical equations are derived to approximate the relation between shallow velocity anomalies and NMO velocity as a basis for traveltime inversion to obtain an initial-approximation velocity model. The new approach is applied to real field data from regions with shallow velocity anomalies.
|
