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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Processing
- A Key to Improved Static and Dynamic
Corrections
in Seismic Data from Saudi-
Arabian Deserts
1 TEEC, Burgwedelerstr. 89, Isernhagen HB, 30916, Germany, phone: +49 511 7240452, fax: +49 511
7240465, [email protected]
2 TEEC, Burgwedeler Str. 89, Isernhagen, D-30916, Germany
Static shifts from near-surface inhomogeneities very often represent the key problem in the processing
of seismic data from
arid regions. In this case study, the deep bottom fill of a wadi strongly deteriorates the image quality of a 2D seismic
dataset. The resulting static and dynamic problems are solved by both conventional and CRS
processing
. A straight forward
approach derives conventional refraction
statics
from picked first breaks, and further goes through several iterations manual
velocity picking and residual
statics
calculation. The surface-induced static and dynamic inhomogeneities, however, are not
completely solved by these conventional methods. In CRS
processing
, the local adaptation of the CRS stacking parameters
results in very detailed dynamic
corrections
. They resolve the local inhomogeneities that were not detected by manual
picking of stacking velocities, and largely compensate for the surface-induced deterioration in the stack. The subsequent
CRS residual
statics
calculations strongly benefit from large CRS stacking fold which increases the numbers of estimates
for single static shifts. This improves the surface consistent averaging of static shifts, and the convergence of the static
solution which removes the remaining static shifts in the 2D seismic data. The large CRS stacking fold also increases the
signal-to-noise ratio in the final CRS stack. An almost identical resolution is obtained by an alternative CRS stack based on
every second shot only. This indicates that the aquisition fold could be halved without deteriorating CRS image quality.