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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 16 (1966), Pages 337-343

West Black Bay, Black Bay and East Black Bay Fields, Plaquemines Parish, Louisiana

Dwight A. Free, Jr.

ABSTRACT

The West Black Bay, Black Bay and East Black Bay fields are located in the prolific upper/middle Miocene oil- and gas-producing trend of Plaquemines Parish, Louisiana.

The stratigraphic section in the subject area consists mainly of strata of Miocene age. Wells drilled to sufficient depth encounter three distinct facies: First, a shallow-water massive Upper Miocene near shore to continental sand facies; then, an intermediate facies consisting of alternating sands and marine shales of the early Upper Miocene and Middle Miocene continental shelf; and finally, a massive shale or deep water facies composed of a dark marine shale facies of the early Middle Miocene continental slope.

The West Black Bay-Black Bay and East Black Bay structures are elongate simple anticlinal closures on the downthrown side of a regional growth fault. These structures have a northwest-southeast alignment, are of low relief, and exhibit a southwestward shift and growth with depth. There is no evidence of salt piercement. Buried faulting is found on the southeastern end of the West Black Bay-Black Bay structure. This faulting is down-to-the-southeast and does not appear to penetrate early Bigenerina 2 sediments.

Massive sand deposition is found down to Lower Bigenerina 2 sediments. However, sand deposition in the Lower Bigenerina 2 and Textularia W zones was extremely erratic making electric log correlations difficult in this zone.

The production is from sands of Upper and Middle Miocene age between the depths of 5,980 feet and 11,200 feet. Two hundred eighteen producing wells have been completed among the three fields and cumulative production from them was 31,318,202 barrels of oil and condensate and 63,131,616 MCF of gas through December, 1964. The estimated recoveries for all reservoirs range from 455 bbls/acre foot to 692 bbls/acre foot. An estimate of recoverable reserves is 72 million barrels liquid hydrocarbon. The reservoir mechanism is water drive.


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