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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Seismic and Sequence
Stratigraphy of Upper Cretaceous Strata, Offshore Alabama and Mississippi
Area
Liu, Kaiyu1
ABSTRACT
Upper Cretaceous (Cenomanian to Maastrichtian)
strata in the offshore Alabama and Mississippi area consist of a thick section
of siliciclastic and carbonate sediments of about 1000 meters. These sediments
were deposited on a broad shelf and coastal plain where eustasy had significant
impacts on sedimentation patterns. An integrated seismic and sequence stratigraphic
approach improves the understanding of Late Cretaceous paleoenvironments,
sea level fluctuations and depositional patterns.
202 lines of high quality, two dimensional,
multi-channel seismic reflection data (approximately 3,500 kilometers in
total length) were studied to decipher the geometry and architecture of Upper
Cretaceous strata in the study area. The stratal patterns as interpreted
from seismic reflector configurations are distinct for different positions
on the continental shelf. Four major sequence boundaries and two maximum
flooding surfaces were identified from seismic reflector configurations and
traced across the shelf. The four sequence boundaries correspond to major
regional unconformities as recognized from outcrop and core studies. These
include a mid-Cenomanian unconformity, a Turonian-Coniacian unconformity,
a Campanian-Maastrichtian unconformity, and a Maastrichtian-Paleocene unconformity
and two maximum flooding surfaces that occur in the Tuscaloosa Marine Shale
(Late Cenomanian to Early Turonian) and middle Mooreville Chalk (Early Campanian)
intervals. The maximum flooding surface for the upper-most sequence was not
recognized from seismic data.
Well log information was integrated with seismic
reflection data through the use of synthetic seismograms and check shot
surveys to establish an integrated seismic and sequence stratigraphic framework.
Facies architecture from middle shelf to outer shelf areas is interpreted
from seismic facies analysis and well log correlations.
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