--> Abstract: Seismic Geomorphology and Stratigraphy of Miocene Reservoirs from Campos Basin, Brazil, by Jose F. Rosalba, Ana A. G. Meira, Andreia R. D. Elias, Carlos M. Soares, Angela Pumputis, and Rodrigo O. Carvalho; #90039 (2005)

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Seismic Geomorphology and Stratigraphy of Miocene Reservoirs from Campos Basin, Brazil

Jose F. Rosalba, Ana A. G. Meira, Andreia R. D. Elias, Carlos M. Soares, Angela Pumputis, and Rodrigo O. Carvalho
Petrobras, Rio de Janeiro, Brazil

This paper presents the depositional architecture of offshore reservoirs in the Campos Basin, which was characterized by seismic geomorphology, well logs, core characteristics and description of analog outcrops. The reservoirs are located under water depths of 600 to 2000m, about 120km from the coast of the State of Rio de Janeiro, southeastern Brazil. Regional analysis allows the recognition of an ancient continental slope, where the reservoirs were deposited. The depositional site of the reservoir sandstones is a 10km wide and 15km long mini-basin, limited to the east by a structural high in the north-south direction, which was created by subjacent salt movement. The mini-basin dimensions are similar to those of the Gulf of Mexico. The mini-basin presents sediments from the Miocene included in the NN1 to NN4 calcareous nannofossil biozones. The sandstones were deposited in lower to mid bathyal settings according to benthic foraminifera. Stratigraphically the sedimentary succession is characterized by turbidity-flow of high and low concentration deposits draped by condensed-section deposits. Debris flow and bottom currents occur secondarily, but with less influence on the reservoir architecture. The seismic geomorphologic analysis represented in maps of seismic attributes makes it possible to interpret the most important architectural elements as high sinuosity channels, oxbow, lobes, etc. The reservoir architecture of these depositional elements is mainly a function of the interaction between sedimentary process and sea-floor morphology.

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