Postrift sequence stratigraphy, paleogeography, and fill history of the deep-water Santos Basin, offshore southeast Brazil
Postrift sequence stratigraphy, paleogeography, and fill history of the deep-water Santos Basin, offshore southeast Brazil
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DOI：
10.1306/01220403043
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发表时间：
2004-07-01
期刊：
影响因子：
3.5
通讯作者：
Brush, ER
中科院分区：
文献类型：
--
作者：
Modica, CJ;Brush, ER
影响桑托斯盆地的事件不同于北部的坎波斯盆地(巴西的大部分石油储量都是在坎波斯盆地发现的)，导致了非常不同的地层。由于这些差异，坎波斯盆地的地层模型不太适合桑托斯盆地(参看。我们将深水桑托斯盆地的后陆架地层划分为11个主要层序，每个层序的平均持续时间约为11英里。并包括中晚白垩世和第三纪。桑托斯盆地复杂的充填历史受到晚白垩世Serra do Mar沿海山脉的抬升以及随后平行于海岸的Paraiba do Sul水系的组织的强烈影响。在晚白垩世和古近纪，南方Paraiba do Sul祖先倾向于集中碎屑流进入桑托斯盆地北部和中部。尽管全球海平面很高，但集中的碎屑流迫使大规模陆架进积和深水浊积沉积。同时，南部的桑托斯盆地相对缺乏碎屑流，淹没的陆架条件占主导地位。这种沉积模式一直持续到渐新世，南帕拉伊巴被占领并改道进入北部的坎波斯盆地，目前该盆地已被清空。在南帕拉伊巴被占领和改道后，桑托斯中北部的大陆架饿死溺水，陆架边缘后退了50多公里(30英里)。相比之下，南桑托斯盆地被厚厚的上渐新世和新近系泥质沉积所埋藏，这些沉积对烃源岩的成熟度有很大影响。
Events that influenced the Santos Basin were different from the Campos Basin to the north (where the bulk of the petroleum reserves in Brazil have been discovered) and resulted in a very different stratigraphy. Because of these differences, the Campos Basin stratigraphic model is poorly suited to the Santos Basin (cf. Cobbold et al., 2001).We divide the postrift stratigraphy of the deep-water Santos Basin into 11 major sequences, each representing an average duration of approximately 11 m.y. and encompassing the middle-Late Cretaceous and Tertiary. The complex fill history of the Santos Basin was strongly influenced by the uplift of the Serra do Mar coastal mountain ranges in the Late Cretaceous and the subsequent organization of the coast-parallel Paraiba do Sul drainage system. The ancestral Paraiba do Sul tended to focus clastic influx into the northern and central Santos Basin during the Late Cretaceous and Paleogene. Focused clastic influx forced massive shelf progradation and deep-water turbidite sedimentation despite globally high-standing sea level. The southern Santos Basin, at the same time, was relatively starved of clastic influx, and drowned shelf conditions prevailed.These depositional patterns persisted until the Oligocene, when the Paraiba do Sul was captured and diverted into the Campos Basin to the north into which it currently empties. After the capture and diversion of the Paraiba do Sul, the north-central Santos Shelf was starved and drowned, and the shelf edge backstepped more than 50 km (30 mi). The southern Santos Basin, in contrast, was buried by a thick sequence of mud-prone upper Oligocene and Neogene sediments that had a great impact on source rock maturity.