Foraminiferal studies carried out in 15 exploratory wells, drilled offshore by Petrobrás in the northem portion of Campos Basin, São Tomé Low area, allowed the reconstructlcn of the regional biochronostratigraphic framework and paleogeographic evolution from "Mid" to Late Cretaceous. Correlative well sections and paleoenvironmental maps are presented, and the following main conclusions are drawn: a) continous subsidence with progressive bathymetric increment controlled the deposition in the area from the Albian to Maastrichtian; b) the deepening process was strongly increased during the Late Cretaceous with the establishment of an oceanic depositional setting; c) the "Mid" Cretaceous was characterized by relatively stable sedimentation in neritic environment; d) restrictive paleoceanographic conditions (low oxygen content) were widespread in the Cenomanian/Early Turonian (? ), with a scarce and low-diversity microfauna; e) the present configuration of the São Tomé Low can be well recognized since the Maastrichtian, the apparent direction of its depositional trend being SW-NE.Resumo indisponível.