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.

中文翻译：

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巴西东北部卡马穆盆地地震地层学

Camamu 盆地位于巴西东北部海岸线，在浅水和深水环境中都具有巨大的油气潜力。然而，尽管已经有一个生产性气田在运营，但该盆地并不为人所知。在此，基于 152 条叠后 2D 地震线、1 个 3D 地震立方体和 34 口带电测井的数据集，报告了裂谷、过渡和漂移大层序的区域地层解释。研究表明，裂谷大序列比以前想象的要复杂得多。在卡马穆盆地南部地区，绘制了 5 个裂谷层序，而在北部地区，在被称为萨尔瓦多横流带 (STZ) 的区域构造线区域，识别了 7 个裂谷层序。这种差异表明裂谷过程中存在构造控制，因为北部地区在地壳破裂期间受到 STZ 横流构造引起的剪应力的强烈影响。对于裂谷后安装的与热沉降相关的裂谷后或“过渡”阶段以及漂移序列，萨尔瓦多的横流带施加的构造控制是不可检测的，盆地的构造沉积演化遵循一般巴西边缘盆地的格局。