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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes


Pub. Id: A133 (1990)

First Page: 287

Last Page: 305

Book Title: M 50: Lacustrine Basin Exploration: Case Studies and Modern Analogs

Article/Chapter: Lacustrine and Associated Deposits in a Rifted Continental Margin--Lower Cretaceous Lagoa Feia Formation, Campos Basin, Offshore Brazil: Chapter 18

Subject Group: Basin or Areal Analysis or Evaluation

Spec. Pub. Type: Memoir

Pub. Year: 1990

Author(s): Dirceu Abrahao, John Edward Warme


The geologic evolution of the Campos basin, offshore southeastern Brazil, is linked to Mesozoic rifting that separated Africa and South America. Lagoa Feia is the basal Lower Cretaceous synrift formation in the stratigraphic sequence of the basin. It formed in a complexly evolving system of rift lakes of variable size and chemistry, overlying and closely related to rift volcanics. Lacustrine limestone and shale and alluvial fan volcaniclastic conglomerates dominate. The lake sequence reaches thickness of 3500 m and is capped by marine evaporites.

Organic-rich lacustrine shale of the Lagoa Feia Formation is the main source rock for the Previous HitoilTop discovered to date in the Campos basin. Pelecypod coquinas constitute the intraformational reservoirs within a limited region. Lacustrine shale also sources reservoirs in overlying Cretaceous platform carbonates and Cretaceous and Tertiary turbidites, including those of the giant Albacora and Marlim fields. Lagoa Feia strata compare well with younger lake deposits of the east African rift system, which provide useful analogs for development of exploration models in the Lagoa Feia.

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