Kirchhoff prestack depth migration
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We use MODEL, CRT, FORMS and DATA packages
for the Kirchhoff prestack depth migration
(Cerveny, Klimes & Psencik, 1988; Bulant, 1996).
The migration consists of one or two-parametric
ray tracing from individual surface points (program crt.for),
calculating grid values of travel time and amplitude
(program mtt.for), common-shot migration
(program grdmigr.for) and stacking of migrated images.
History files summarize parameters and execute programs
for all 240 shot-receiver configurations in profile lines.
2-D migration
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The anisotropy in the upper layer of the velocity model used for
computation of the recorded wave field is the
same
as the anisotropy in the velocity model used for migration.
The crosses denote the interface in the velocity model used
for computation of the recorded wave field.
-
The anisotropy in the upper layer of the velocity model used for
computation of the recorded wave field is
different
from the anisotropy in the velocity model used for migration.
-
Transversely isotropic media with a horizontal
symmetry axis (HTI)
-
Monoclinic anisotropy (MA)
3-D migration
-
The anisotropy in the upper layer of the velocity model used for
computation of the recorded wave field is the
same
as the anisotropy in the velocity model used for migration.
-
We compute and stack migrated sections in 2-D plane (blue) located
at the middle of the shot-receiver configuration
(at horizontal coordinate of 1.5 km).
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Triclinic anisotropy (TA)
-
Monoclinic anisotropy (MA)
