Kinematic 3D Retro-Deformation of Fault Blocks Picked from 3D Seismics
Lohr, Tina
Krawczyk, Charlotte M.
Oncken, Onno
Endres, Heike
Samiee, Ramin
Trappe, Henning
Kukla, Peter A.
Universitätsverlag Göttingen
Article in Anthology
Verlagsversion
Deutsch
Tanner, David C.; Lohr, Tina; Krawczyk, Charlotte M.; Oncken, Onno; Endres, Heike; Samiee, Ramin; Trappe, Henning; Kukla, Peter A., 2006-03: Kinematic 3D Retro-Deformation of Fault Blocks Picked from 3D Seismics. In: Philipp, S.; Leiss, B; Vollbrecht, A.; Tanner, D.; Gudmundsson, A. (eds.): 11. Symposium "Tektonik, Struktur- und Kristallingeologie"; 2006, Univ.-Verl. Göttingen, p. 226 - 228., DOI https://doi.org/10.23689/fidgeo-1823.
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Movement on fault planes causes a large
amount of smaller-scale deformation,
ductile or brittle, in the area surrounding
the fault. Much of this deformation
is below the resolution of reflection
seismics (i.e. sub-seismic, <10m
displacement), but it is important to determine
this deformation, since it can
make up a large portion of the total bulk strain, for instance in a developing
sedimentary basin. Calculation of
the amount of sub-seismic strain around
a fault by 3-D geometrical kinematic
retro-deformation can also be used to
predict the orientation and magnitude
of these smaller-scale structures.
However, firstly a 3-D model of the fault
and its faulted horizons must be constructed
at a high enough resolution
to be able to preserve fault and horizon
morphology with a grid spacing of
less than 10 m. Secondly, the kinematics
of the fault need to be determined,
and thirdly a suitable deformation algorithm
chosen to fit the deformation
style. Then by restoring the faulted
horizons to their pre-deformation state
(a ‘regional’), the moved horizons can
be interrogated as to the strain they
underwent. Since strain is commutative,
the deformation demonstrated during
this retro-deformation is equivalent
to that during the natural, forward deformation...