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Book Chapter

Reservoir Systems of Selected Basins of the South Atlantic

By
Louis M. Liro
Louis M. Liro
Texaco Exploration Houston, Texas, U.S.A. Currently: Veritas Exploration Services Houston, Texas, U.S.A.
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William C. Dawson
William C. Dawson
Texaco Inc. Houston, Texas, U.S.A.
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Published:
January 01, 2000

Abstract

Early Cretaceous rifting of the South Atlantic basin resulted in the development of three unconformity-bound tectono-stratigraphic megasequences that are recognizable in petroliferous basins along the present-day margins of both Brazil and west Africa. These megasequences have been termed nonmarine/synrift, transitional marine, and marine. These megasequences provide a framework for understanding the character and distribution of hydrocarbon reservoirs within the South Atlantic petroleum systems. Hydrocarbons occur in nonmarine and marine stratal packages in both carbonates and siliciclastics. Reservoirs in the marine megasequences contain an estimated 70% of the region's known oil reserves, most of which have been discovered in the last two decades in deep-water fields.

Each reservoir system requires a comprehensive evaluation of depositional systems and diagenetic modification. Deep-water siliciclastic reservoirs are controlled by sediment provenance and transport mechanisms to the deep-water setting and less so by diagenesis. Synrift reservoirs are more affected by diagenesis, requiring detailed petrographic analysis. Carbonate reservoirs of the South Atlantic display the greatest degree of variability thus requiring detailed petrographic work. Our results suggest that the carbonate reservoirs have the most complex diagenetic profiles and must be related to the timing of hydrocarbon migration to better understand charge risk.

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Contents

AAPG Memoir

Petroleum Systems of South Atlantic Margins

Marcio Rocha Mello
Marcio Rocha Mello
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Barry J. Katz
Barry J. Katz
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American Association of Petroleum Geologists
Volume
73
ISBN electronic:
9781629810706
Publication date:
January 01, 2000

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