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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)

EXTENDED ABSTRACT: Sequence Stratigraphic Evolution of the Mensa Minibasin, Mississippi Canyon, Northern Deep Gulf of Mexico

van den Berg, Aaron,1,2 Weimer, Paul,1 and Bouroullec, Renaud1,3

ABSTRACT

This study documents the stratigraphic 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 stratigraphic evolution is divided into eight intervals/sequences between 99 and 9.0 Ma. From 99 to 24 Ma, the lithologies in the Mensa minibasin are interpreted as dominantly deepwater marls with interbedded shales based on regional well data and seismic facies. The interval reflects little siliciclastic input into the area. From 24 to 9 Ma, seven intervals/sequences are interpreted. Sands deposited in the Mensa minibasin are interpreted to lie within the depothicks (paleobathymetric lows) between 24 and 13.05 Ma. As the Mensa turtle structure began to form, the depositional systems became primarily channel-levee systems that flowed south through the area. Thick overbank shales with some interbedded channel-fill sands are present. The Mensa gas field produces from amalgamated sheets sands that onlap the 9 Ma horizon onto a turtle structure.

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