--> Facies Architecture of a Shelf Margin Lowstand Complex, Eugene Island Block 330 Field, Louisiana Offshore, by B. S. Hart, P. B. Flemings, D. Sibley, and B. Bishop; #90986 (1994).
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Abstract: Facies Architecture of a Shelf Margin Lowstand Complex, Eugene Island Block 330 Field, Louisiana Offshore

B. S. Hart, P. B. Flemings, D. Sibley, B. Previous HitBishopTop

The GA sand (Block 330) and correlative units to the north and south capture a remarkable downdip transition from incised channel to slope depositional environments over about 8 km. We use 3-D seismic and log data to relate depositional facies relationships, isopach trends, seismic reflection character and production trends. Deposition of the GA sands and correlative deposits to the north and south occurred during an eustatic lowstand at about 1 Ma. In the footwall of the principal regional growth fault, GA sands are sharply based and show channel characteristics. Sand thicknesses locally exceed 100 m near the crest of the rollover anticline, and isopachs show complex patterns due to relief at the base of the unit developed during lowstand incision. Seismic sections show a southward t ansition from chaotic and channelized reflectors near the anticline's crest to prograding clinoforms on the south flank of the rollover. The clinoforms can have over 100 m present day relief and represent the progradation of a delta slope which was being supplied sediment through the channels to the north. Submarine/slope channels appear to be preserved in places in the clinoform region. Logs through the southern area show basal sands (slope fan/turbidites) overlain by a shaley section with some sands (prograding lobes). Portions of the slope were affected by mass movements; these areas are imaged on seismic sections as masses of contorted reflectors which disrupt stratal continuity. This complex is charged both within channel sands on the crest of the rollover and in sands of the clinof rms to the south.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994