Monday, March 23, 2015

Velocity Model Beneath Reefs

(a) A reef composed of high-velocity limestone encased in lower-velocity shales produces a velocity pull-up on underlying reflections.

(b) Same as (a), except the reef has a more rounded form.

(c)A reef encased in an evaporitic sequence with high interval velocity push-down on underlying reflections.

(d) A reef with low-velocity basinal shales to its left and high-velocity backreef evaporites to its right produces a push-down beneath the shales and pull-up beneath the evaporites. 

Reference & Image Courtessy: Michael E. Badley, ; Practical Seismic Interpretation

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