Petroleum Geology of the Campos Basin Brazil, a Model for a Producing Atlantic Type Basin
L. R. Guardado, L. A. P. Gamboa, C. F. Lucchesi, 1989. "Petroleum Geology of the Campos Basin Brazil, a Model for a Producing Atlantic Type Basin", Divergent/Passive Margin Basins, J. D. Edwards, P. A. Santogrossi
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The Campos basin is currently the most productive offshore Brazilian petroleum-bearing basin. It covers an area of about 100,000 km2along the southeastern Brazil passive margin (Figure 1). The basin extends roughly from 15 km inland to the 3400 m isobath. Geologic studies of the basin started during the 1930s with the mapping of onshore and coastal areas by Lamego (1937, 1940, 1944, 1945). In 1958 PETROBRAS carried out a gravimetric survey of the onshore area and drilled a strati- graphic test at Cape São Tomé. Detailed seismic investigations of offshore areas began in 1968, and the first oil field, the Garoupa field, was discovered in 1974 (Tessari et al., 1978; Meister, 1980; Guardado et al., 1982; Marroquim et al., 1984). To date, more than 30 oil fields have been discovered and the basin is known to contain oil reserves of 1441 million bbl. This estimate does not include potential reserves from deep-water giant oil fields which have been recently discovered and still are not fully appraised. The majority of producing fields in the basin lie along a northeast-southwest trend, seaward of the hingeline. New giant oil fields are still being discovered. These new fields have been drilled in water depths ranging from 400 to 1500 meters. As a consequence there is increasing interest in exploration and exploitation in still greater water depths in the Campos basin.
The purpose of this chapter is to synthesize the geology and exploration history of this basin in order to provide