--> Abstract: The Development of Plio/Pleistocene Turbidite Reservoirs at South Timbalier 295 Field, Gulf of Mexico, by E. P. Mason, R. S. Barnard, and M. Kohli; #90987 (1993).

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MASON, ERIK P., R. S. BARNARD, and MADHU KOHLI, Shell Offshore Inc., New Orleans, LA

ABSTRACT: The Development of Plio/Pleistocene Turbidite Reservoirs at South Timbalier 295 Field, Gulf of Mexico

AAPG ANNUAL MEETING
New Orleans, Louisiana
April 25-28, 1993

South Timbalier 295 Field discovery in 1984 was followed by 3D seismic interpretation in 1986, development drilling in 1986-88, and first production in 1989. A second 3D seismic survey, shot in 1988-89, was integrated with well and production data in a field study in 1990-91. The early production data caused changes to turbidite depositional models which impacted redevelopment drilling in 1991-92.

Hydrocarbons are structurally trapped in Pliocene and Pleistocene aged sands ranging from 7500 to 14,200 feet in depth. Estimated recoverable reserves are 50 MMBOE. Production is expected to average 11,000 BO and 40 MMCFG daily.

Development drilling penetrated discontinuous amplitude and non-amplitude supported sands. The linear nature of the seismic events, poor correlatibility and abrupt changes in sand thickness led to a turbidite channel sand depositional model. All reservoirs were expected to be depletion drive.

Production information integrated with well and 3D seismic data showed main amplitude supported reservoirs were more connected than originally thought. Strong pressure support indicating water-drive reservoir drive mechanisms resulted in higher recovery factors. Paleo-reconstruction indicated sediment ponding within a low-relief, closed mini-basin. The turbidite depositional model for two main pay sands changed from turbidite channel to mid-fan lobes onlapping a paleo-high.

Redevelopment drilling took advantage of the new interpretations. Three of the six wells were placed to maximize drainage from the larger water-drive reservoirs. Wells were drilled to the base of these reservoirs resulting in decreased costs and improved profitability.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.