--> Abstract: High-Resolution Seismic Imaging of a Passive Margin Turbidite Lobe Complex in Deep-Water Systems: Impact on Reservoir Modeling, by Carlos Jorge Abreu, Ciro Jorge Appi, Fernando Guilardi Silva, and Renata Solagaistua Matos; #90039 (2005)

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High-Resolution Seismic Imaging of a Passive Margin Turbidite Lobe Complex in Deep-Water Systems: Impact on Reservoir Modeling

Carlos Jorge Abreu1, Ciro Jorge Appi2, Fernando Guilardi Silva2, and Renata Solagaistua Matos2
 1 Universidade Federal do Rio de Janeiro, Rio de Janeiro, CEP, Brazil
2 Petrobras, Rio de Janeiro, Brazil

The comprehension of reservoir depositional models emphasizing architecture is extremely important to optimize exploration/exploitation of hydrocarbons in deep/ultra-deep-waters of Brazilian basins, given that approximately 90% of Brazil’s reserves are in such reservoirs. As part of a broader project that analyzes the chronology and events correlation from source to sink for deep-water depositional environments, the turbidite lobe complex of the Holocene/Pleistocene Almirante Camara system, located in Campos basin, is being investigated as an analog model.

The Almirante Camara canyon widens to form a low sinuosity channel complex within a trough, which feeds a complex of terminal lobes, on a low gradient slope. The lobe complex consists of five individual channelized lobes and associated chaotic facies, the oldest lobe being, possibly, of the lower Pleistocene.

Acquired 2D high resolution seismic data calibrated with more than 27 piston-cores for sedimentary facies and biostratigraphy, constitute an excellent suite of data which allowed the mapping of the depositional architecture of those individual lobes and their stratigraphic evolution, which is highly controlled by halokinesis. Aptian evaporites nearly form a ring of diapirs/domes and walls that delineate the sea-bed morphology, where the turbidite lobe complex is forming.

Seismic facies identified in the high resolution lines were also identified in the corresponding 3D conventional data, like the Almirante Camara canyon, which has been aggrading since the lower Miocene, possibly being a pathway for older deep-water deposits that accounts for giant oil fields. Therefore, a wide possibility of better understanding the Tertiary/Cretaceous models of the Campos is opened.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005