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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Depositional
Environment and Petroleum Production, UL Series Sands, Pointe a la Hache
and Diamond Fields, Plaquemines Parish, Louisiana
Sevier, Daniel S.1,2 and Breyer, John
A.2
ABSTRACT
Pointe a la Hache and Diamond fields, Plaquemines
Parish, Louisiana, produce oil and gas from the Miocene trend along the northern
edge of the Gulf of Mexico basin. The fields have had a combined production
of 178 billion cubic feet of gas and 49 million barrels of oil since the
discovery wells were drilled in 1948 and 1958, respectively. The reservoirs
in the fields are sands in the late Middle Miocene UL series, named for the
inner neritic foraminifer Uvigerina lirettensis. Thirteen of the fourteen
sands in the UL series are productive in the two fields.
The sands were deposited as part of prograding
delta complex near the Miocene shelf edge. The deltas resembled the modern
Mississippi Delta because the sediment delivery systems and sediment dispersal
systems in the Miocene gulf were similar to those that exist in the area
today. Isopach and electrofacies distribution maps of the sands resemble
those of mouth-bar deposits of the modern Balize Delta. Wells produce from
proximal and distal mouth-bar deposits and from axial and marginal locations.
Position on the mouth bar doesn't correlate with reservoir potential or reservoir
quality. The hydrocarbons accumulated in fault-related structural traps and
combined stratigraphic-structural traps. The sands do not thicken across
the faults, so faulting post-dated deposition. No purely stratigraphic traps
were identified. Untested fault closures provide additional development opportunities.
Seismic data provide the best means of recognizing these traps.
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