Seismic Stratigraphy of Camamu Basin, Northeastern Brazil
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Pure and Applied Geophysics
Seismic Stratigraphy of Camamu Basin, Northeastern Brazil PAULO AUGUSTO VIDIGAL-SOUZA,1
DANIEL BONO VILAS-BOAS,2 ANDRE´ GONDIM BRANDA˜O,1 and MICHAEL HOLZ1
Abstract—The Camamu Basin is located at the northeastern Brazilian coastline and has significant hydrocarbon potential in both shallow and deep water settings. However, despite an already operating productive gas field, the basin is not well known. Herein, a regional stratigraphic interpretation of the rift, the transitional and the drift megasequences is reported, based on a data set of 152 post-stacked 2D seismic lines, 1 3D seismic cube and 34 wells with eletro-logs. The study revealed that the rift megasequence is much more complex than previously thought. In the southern region of the Camamu Basin, five rift sequences were mapped, while in the northern region, in the area of the regional tectonic lineament known as the Salvador Transcurrent Zone (STZ), seven rift sequences were recognized. This difference suggests a tectonic control during the rifting process, because the northern region is intensely affected by shear stress induced by transcurrent tectonics of the STZ during the crustal breakup. For the post-rift or ‘‘transitional’’ phase associated with thermal subsidence installed after the rift, as well as for the drift succession, the tectonic control exerted by Salvador’s Transcurrent Zone is not detectable and the tectono-sedimentary evolution of the basin follows the general pattern of the Brazilian marginal basins. Keywords: Seismic stratigraphy, Rift, Transitional, Drift, Camamu Basin.
1. Introduction Due to the increasing demand for energy, some Brazilian exploratory frontier basins have been the focus of geological reevaluation. This is the case of the Camamu Basin, one of the passive margin basins located at the northeastern shoreline of the country. It is a basin with high potential for oil generation in the
1
Geosciences Institute of UFBA, Geophysics, Theoretical and Applied Stratigraphy Group (GETA), Federal University of Bahia, Salvador, BA 40170-290, Brazil. E-mail: paulo. [email protected]; [email protected]; [email protected] 2 CGG, Av. Pres. Wilson, 231, Centro, Rio de Janeiro, RJ 20030-020, Brazil. E-mail: [email protected]
shales of the rift phase and some inferred possibilities for stratigraphic and structural traps due to rift tectonics and involving hydrocarbon accumulations related to salt tectonics (Rostirola 1997; Mohriak et al. 2008). However, the basin’s only economic hydrocarbon discovery so far has been an active gas field, discovered in 2000 and operated by a consortium of Brazilian oil companies. It is located at a water depth of 35 m and has been producing since 2007, becoming one of the largest producing gas fields in Brazil, with an average daily production of 6.0 million m3. The field is estimated to continue producing until 2024 and remains the only significant discovery so far, despite available geological data. The Camamu Basin is part of the Brazilian Passive Margin Basi
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