--> Abstract: A Sequence Stratigraphic Analysis To Productive Pliocene Reservoirs In The Complexly Faulted, Mature Teak Field, Columbus Basin, Trinidad, by S. R. Wharton; #90928 (1999).

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WHARTON, STANLEY R.
AMOCO Trinidad Oil Company, Hou. TX

Abstract: A Sequence Stratigraphic Analysis to Productive Pliocene Reservoirs in the Complexly Faulted, Mature Teak Field, Columbus Basin, Trinidad

The Teak Field, located in the prolific Columbus Basin offshore Trinidad, produced over 332 mmbo and 1.4 TCF gas from at least 22 different lithostratigraphic units. Production was derived mainly from 12 units, the U series, 0/1 series, T series and the 0/2 series being the most significant,

A sequence stratigraphic framework was developed using available biostratigraphic data, well logs, 3D seismic and core data to assess the main productive sequences and their depositional characteristics because of variations in production potential realised within and between the reservoir series. Using this data at least two predominant depositional environments were identified and revealed with 3D seismic and biostratigraphic data. The fluvial phase showed mainly 3rd order sequences dominated by incised valley fills with some showing baffles to production in post-drilling assessments. The stacking pattern for the younger deltaic sequence is different and is dominated by 4th order cycles. Production potential is comparatively lower. Structurally the highest production from the main reservoirs was on the hanging wall of the dominant growth fault with additional closure provided by synthetic and antithetic faults. Shales at the top of incised valley fills and above sands of the Transgressive Systems Tracts provided excellent seals. Within the associated rollover anticline variable production was realised mainly from the incised valley fills and shallow marine sands from the T series.

The sequence stratigraphic approach enabled an understanding of the characteristics and hence production potential of the reservoir sequences which can be readily applied in a developing field setting.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas