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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.4, No.1, pp.3-34, 1981

©Copyright 2000 Scientific Press, Ltd.

POROSITY MODELS AND OIL EXPLORATION OF AMAPÁ CARBONATES, PALEOGENE, FOZ DO AMAZONAS BASIN, OFFSHORE NW BRAZIL

Albert V. Carozzi*

*Professor of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA and International Oil Exploration Consultant.


Abstract

The extensive thick Paleogene carbonate platform (Amapa Formation) of the Foz do Amazonas Basin probably the largest coralgal-foraminiferal platform of the geological record developed through four depositional cycles expressing global eustatic changes of sea level. It shows five environmental belts: slope apron coralgal platform large foraminifer shoal finger coral bank and restricted lagoon all of which associate bioaccumulated and bioclastic microfacies. At all times a terrigenous environment consisting of fan deltas and lagoonal fine-grained clastics existed immediately behind the carbonate platform and was connected with the open ocean by transverse troughs filled with shales and carbonate olistoliths. This combination of clastic and carbonate environments is unique in the geological record and today only the Belize Shelf displays comparable conditions.

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