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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract:
Sequence
Stratigraphic
Framework and Depositional
Variations of Miocene
Lowstand Systems Tracts,
South Louisiana
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By
Schlumberger Holditch-Reservoir Technologies, Denver, Colorado
Facies of Miocene lowstand systems tracts comprise a large
portion of the remaining exploration potential for deep
untested objectives in southwest Louisiana. The complex and
highly variable section is contained in 22 major depositional
sequences deposited from 21.9 to 7 million years ago. Each
sequence
ranged in duration from 0.5 to 1.5 million years.
Regional
well
log
, seismic, and biostratigraphic correlation and
mapping of the
sequence
stratigraphic framework defines the
occurrence and extent of lowstand facies that filled intra-slope
basins across south Louisiana's coastal zone.
From oldest to youngest, the sequences encompass the
Cristellaria H. through Cristellaria K. biozones. In onshore and
state water areas, 14 sequences contain regionally correlative
lowstand systems tract components. Amalgamated, massive
turbidite facies of basin floor fan complexes are not recognized
in intra-slope basins in association with rapid depositional
cycles. Deepwater fan and channeled levee facies of slope fan
complexes and deltaic facies of prograding complexes are well
-developed
throughout the early and middle Miocene section.
Late Miocene lowstand deposits are best developed in the offshore
trend.
Syndepositional fault movement and salt withdrawal controlled thickness trends, facies patterns, sandstone content, and the position and trend of the shelf/slope break. Sandstone-rich basin floor fans, slope fans, and prograding deltaic complexes are best developed in intraslope basins where paleobathymetric confinement and accommodation were greatest.
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