Abstract
This paper presents an overview of the results obtained from a 3-D
prestack depth migration of the ISO89-3D data set. The algorithm
is implemented as a Kirchhoff-type migration, in which the migrated
image is generated by weighted summation along diffraction surfaces
through the shot record section. The diffraction surfaces are computed
by a 3-D finite difference solution of the eikonal equation. A 3-D
macro-velocity model derived mainly from wide-angle tomographic inversion
served as input for the travel-time calculations. The results of
the migration are presented as slices through a volume covering an
area of 21 km 2 21 km in the horizontal and 15 km in the vertical
direction, centered around the KTB drill hole. In these slices the
continuation of the Franconian Lineament or SE1 reflector, respectively,
can be identified over most of the survey area as a northeast dipping
reflector plane. Its signature appears partly curved and discontinuous
and with different strength of reflection down to a maximum depth
of 9 km. About 5 km to the south-southeast of the KTB drill hole
the uppermost top reflection of the Erbendorf body (EB) can be recognized
at approximately the same depth. The slices clearly show its complicated
internal structure consisting of several apparently separated reflective
parts. Moreover, the geometry and the shape of a few other subsurface
structures are described.
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