Stratigraphic and Structural Interpretations by Using
Diffraction
Seismograms
Richard K. Snavely, A. K. M. Sarwar
A two-dimensional seismic diffraction
modeling method has been applied to an
east-west cross section of Bay Marchand located 1 ¼ mi north of the Bay
Marchand/South Timbalier area boundary in block 2 through block 4 of T23S, R23E.
A 20-layer geologic depth model has been constructed
from
the correlation of
SP-induction and sonic well logs. Each layer has been assigned a velocity
determined
from
the corresponding sonic logs and a density approximated
from
Gardner's rule. A synthetic seismogram has been generated due to the geologic
depth model using
diffraction
modeling computer code.
A comparison of the synthetic seismogram and the seismic field trace reveals
salt dome piercement, graben faulting, pinch-out reflectors, and salt truncation
reflectors. The reflector shape, shadow zone from
faulting, and
diffraction
pattern outlining the boundary of the salt dome on the synthetic seismic section
are similar to those on the field seismic section.
AAPG Search and Discovery Article #91036©1988 GCAGS and SEPM Gulf Coast Section Meeting; New Orleans, Louisiana, 19-21 October 1988.