Structural-velocity analysis using migrated seismic data
, by Jos van Trier
In structurally complex regions, an interactive interpretation of the migrated image is
useful in determining the structural-velocity model. After the structural features are
incorporated in the model, the velocities inside the structures can be determined by a
gradient optimization scheme, where the objective is maximization of semblance in the
migrated image. The semblance is calculated for reflection events in the prestack migrated
data that correspond to reflectors picked in the interpretation. The gradients needed for
the optimization are calculated by ray tracing and by determining semblance derivatives
from the prestack migrated data.
STANFORD