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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Sequence Stratigraphic
Evolution of the Thunder Horse Mini-Basin, Mississippi Canyon, Northern
Deep Gulf of Mexico
Lapinski, Todd,1,2 Weimer,
Paul,1 and Bouroullec, Renaud1,3
ABSTRACT
This study documents the stratigraphic evolution
of the Thunder Horse mini-basin, in the southern Mississippi Canyon, northern
deep Gulf of Mexico. Analysis is based on the integration of a 378 square
mile 3-D seismic data set, several wireline logs, and biostratigraphic data.
The stratigraphic evolution is divided into
nine intervals/sequences deposited between 99 and 9.0 Ma. From 99 to 24 Ma,
the lithologies in the Thunder Horse mini-basin are interpreted as dominantly
deepwater marls with interbedded shales. The interval reflects little siliciclastic
input into the area. From 24 to 14.35 Ma, a major input of deepwater siliciclastic
sediments began as sands are deposited in amalgamated channel-fills and amalgamated
sheets within major paleobathymetric lows, and shales were deposited across
paleobathymetric highs. From 14.35 to 13.05 Ma, a large mass transport complex
was deposited to the south and is overlain by channel-fill and overbank sediments.
From 13.05 to 9.0 Ma, the lithologies throughout the area are dominantly
overbank shales with thin channel-fill sands, suggesting that major sand
was bypassing through the area farther downslope to the south.
The main reservoir sands at the Thunder Horse
and Thunder Horse North discoveries occur between 15.3 to 14.35 Ma. The sands
were deposited within a paleobathymetric low in a mixture of amalgamated
channel-fill sands and possible amalgamated sheet sands.
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