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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Sequence Stratigraphy
of Upper-Miocene to Pleistocene Sediments of Southwestern Mississippi Canyon
and Northwestern Atwater Valley, Northern Gulf of Mexico
Sincavage, Ryan,1 Weimer,
Paul,1 and Bouroullec, Renaud1,2
ABSTRACT
A sequence stratigraphic framework for Miocene-Pliocene
sediments of northwestern Atwater Valley and southwestern Mississippi Canyon,
northern Gulf of Mexico, was established using a suite of 2-D seismic data,
well logs, and biostratigraphic data. Two end-member mini-basin types are
observed- supra-salt mini-basins, which are floored by autochthonous salt,
and deep mini-basins, which do not contain any evidence of allochthonous
salt. Within the study area, both types of mini-basins are dissected by isolated
salt tongues and diapirs to the north, and the extensive Sigsbee Salt Nappe
to the south.
A total of twelve depositional intervals/sequences
were correlated throughout the study area between 24 Ma to the Present. Seismic
facies analysis, biostratigraphy and well log interpretation were used to
generate isochron, seismic facies, and geologic facies maps for six intervals.
Eight fields or discoveries are located within the study area. Reservoir
sands are principally tabular sheet sands, channel-fill and overbank deposits.
The Neogene geologic and structural evolution
of the study area has been divided into four informal phases of sediment
delivery. Phase I (24-10.75 Ma) is characterized by active withdrawal of
the top Cretaceous allochthonous salt system and a period of sediment starvation.
Early evolution of the Neogene allochthonous salt system began in Phase
II (10.75-8.20 Ma), and sediment delivery increased to a maximum during this
time period. Phase III (8.20-5.4 Ma) consists of continued withdrawal of
the Neogene allochthonous salt system and a return to low sediment input.
Final emplacement and burial of the Neogene allochthonous salt occurred during
Phase IV (5.4 Ma-present), accompanied by thin supra-salt deposition above
allochthonous salt.
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