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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Structural Evolution
of the Mensa Minibasin, Mississippi Canyon, Northern Deep Gulf of Mexico
van den Berg, Aaron,1 Weimer, Paul,2 and
Bouroullec, Renaud3
ABSTRACT
This study documents the structural evolution
of the Mensa minibasin, in south-central Mississippi Canyon, northern deepwater
Gulf of Mexico. Analysis is based on the integration of a 378 square mile
3-D seismic data set, wireline logs, and biostratigraphy.
The Mensa minibasin consists of several structural
features that affected its geologic evolution: basement, autochthonous salt,
three allochthonous salt systems (top Albian -99 Ma, top Cretaceous -66 Ma,
and Neogene), strike-slip faults, and a major turtle structure with extensive
crestal, normal faults. Remnant salt pillows are present on the 99 Ma horizon
(top Albian system) and on the 66 Ma horizon (top Cretaceous system) throughout
the Mensa minibasin. These salt systems formed weld surfaces beneath the
Mensa gas field.
Structural features evolved during several discrete
intervals. From 99 to 24 Ma, an extensive allochthonous salt canopy existed
within the Mensa minibasin. This salt formed a bathymetric high, causing
a condensed section to develop. From 24 to 15.3 Ma, the top Albian and top
Cretaceous allochthonous salt systems deformed into six remnant salt pillows.
The evacuation of salt from these allochthonous systems provided accommodation
for bowl and trough shaped external stratigraphic forms. Salt evacuating
from these allochthonous systems initiated diapirism of the Neogene allochthonous
salt level.
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