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Abstract

The integration of regional 3D seismic, well logs, cores, and biostratigraphic data gathered in a sequence stratigraphic approach provide a basis for interpreting the Oligo-Miocene and Miocene system as a whole. This stratigraphic interval, which contains the most of oil reserves in Campos basin turbidites, was divided into third and fourth order sequences and mapped across the shelf, slope, and basin.

The characteristic depositional geometries recognized in seismic sections are: (1) shelf-edge prograding delta complex; (2) shelf breaching incised valleys; (3) slope erosive bypass zone, which has straight shallow channels and canyons; (4) braided sandy submarine channels filling fault-related depressions and troughs; and (5) asymmetric or elongated sandy turbidite lobes and lobes reworked by bottom currents.

Shelf-edge prograding delta complexes are comprised of granules and coarse- to very coarse-grained sands deposited during the late lowstand systems tract. Common turbidite facies are: (A) extra-formational conglomerates with shallow water bioclasts; (B) structureless medium- to fine-grained sandstones containing dispersed granules and coal fragments; (C) intraclastic sandstones; and (D) fine- to very fine-grained laminated sandstones. Heteroliths are present at the very end of the cycles.

Catastrophic floods related to strongly prograding fluviodeltaic systems caused hyperpycnal flows during sea-level falls are assumed to be the main process responsible for transferring large amounts of sandy sediments to the basin. The denudation of the Serra do Mar uplift supplied the large volumes of sediment required to fill depositional lows related to inherited basement structures and halokinesis, ultimately controlling the accommodation space.

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