High-resolution velocity inversion of migrated data after structural interpretation
, by Jos van Trier
After determining a structural-velocity model, accurate velocity analysis might still be
necessary in possible target zones for oil exploitation, or in areas where the velocity
model is inconsistent with available geophysical or geological information. Reflections
events in the constant surface location (CSL) gathers after migration are studied for
this analysis. Variations in the depth of these events are inverted to find any local
velocity perturbations, and the amplitude-versus-angle behavior of the events is used to
verify velocity contrasts in the structural model.
STANFORD