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Book Chapter

Plio-Pleistocene Shelf Margin Deltas From Trinidad—Outcrop and Subsurface Examples

By
Grant D. Wach
Grant D. Wach
Department of Earth Sciences Dalhousie University Halifax, Nova Scotia Canada B3H 3Z4
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John Frampton
John Frampton
Biostratigraphic Associates (Trinidad) Ltd. P.O. Bag 366B, General Post Office, Wrightson Road Port of Spain Trinidad and Tobago, West Indies
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Johan Sydow
Johan Sydow
BP Trinidad and Tobago P.O. Box 714 Port of Spain Trinidad and Tobago, West Indies
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Lesli J. Wood
Lesli J. Wood
Jackson School of Geosciences Bureau of Economic Geology University of Texas at Austin University Station, Box X Austin, Texas 78713-8924
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Published:
December 01, 2013

Abstract

Offshore of Eastern Trinidad in the Columbus Basin, oil and gas reservoirs are in stacked reservoirs within a sedimentary succession of 10,000–30,000 feet deposited during the Plio-Pliestocene. Many of these reservoirs represent shelf margin deltas, produced as the precursor to the present day Orinoco River prograded basinward and deposited thick wedges of sediment.

The outcrops of the Pliocene Mayaro formation along the Mayaro coastline of southeastern Trinidad comprise thick successions of sand and shale units that are the direct analogs for the subsurface fields being produced offshore. Syndepositional faulting, slumping, injection features and turbidites, a paucity of trace fossils, the absence of delta plain deposits or distributary channel deposits coupled with foraminiferal data that indicates a middle neritic setting, all point to a delta system at the edge of the shelf. Autocyclic processes can be discerned within the abandonment phase of the delta with strong evidence of burrowing by suspension feeders, during reworking by wave action and alongshore drift of the delta deposits.

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Shelf Margin Deltas and Linked Down Slope Petroleum Systems–Global Significance and Future Exploration Potential

Harry H. Roberts
Harry H. Roberts
Houston, Texas
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Norman C. Rosen
Norman C. Rosen
Houston, Texas
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Richard H. Fillon
Richard H. Fillon
Houston, Texas
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John B. Anderson
John B. Anderson
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
23
ISBN electronic:
978-0-9836096-7-4
Publication date:
December 01, 2013

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