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Organic Geochemical Characterization of an Albian-Turonian Interval in the Campos Basin

South Atlantic Basins Research Symposium Presentation
AAPG Distinguished Lecture

Authors: Gustavo Camelo Acevedo, Ecopetrol Óleo e gas do Brasil (presenter); Diego Fernando Garcia Bautista, Ecopetrol; João Graciano Mendonça Filho, Universidade Federal do Rio de Janeiro

The Campos offshore basin covers an area of about 100,000 km2 in the southeastern Brazilian continental margin. It is the second largest Brazilian oil and gas producer basin. Reservoirs are represented by Aptian carbonates and siliciclastic rocks ranging from Upper Cretaceous to Miocene. The main source rocks were deposited in lacustrine, alkaline waters under anoxic conditions with variable salinity, ranging from brackish to saline represented by the Lagoa Feia Formation. Such rocks are characterized by calcareous black shales rich in bacterial and algal-derived type I kerogen, up to 9% TOC (Trindade et al., 1995).

Several geochemical, biostratigraphic and palaeoenvironmental studies in the Campos basin (Dias-Brito, 1982; Mello et al., 1989), suggested the presence of anoxic events, favorable for the deposition of organic – rich sediments, in a few mid Cretaceous sections of the South Atlantic margin.

The organic matter (OM) content in the Albian – Turonian sediments was studied in two wells in order to describe the organic facies characteristics, depositional paleoenvironments and thermal maturity.

Furthermore, the hydrocarbon generation of these kerogens was appraised as a potential source rock for the post-salt petroleum systems in restricted areas of the basin. Upper Cretaceous source rocks sourced most of the hydrocarbon’s accumulations in Trinidad and Tobago, Venezuela, Ecuador, Peru and Colombia (Talukdar et al., 1994). Extensive areas of effective Cretaceous source rocks are widespread in South America (Daswood & Abbots, 1990; Mora, 2000; Maceralli, 1998; Suhas et al., 1994).


Gustavo Andres Camelo Acevedo, Ecopetrol Brasil

Gustavo holds a MSc from the Universidade Federal do Rio de Janeiro.

With 5 years of experience in the industry, he is Exploration Geologist at Ecopetrol Brasil, in Rio de Janeiro, where he elaborates multi 1D, 2D and 3D basin and petroleum systems models with the aim of evaluate petroleum charge effectiveness through the study of oil generation, migration and accumulation in different basins along the Brazilian continental margin; nowadays he focuses in the Pre-salt of Campos and Santos Basins. He also performs source rock potential evaluation based in geochemical and seismic data; regional analysis and evaluation of exploration opportunities (blocks and prospects) to Ecopetrol Brasil including the analysis of regional tectonics and structural geology.

Gustavo is a member of AAPG, ALAGO, EAFE and SPWLA.

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