西南石油大学学报（自然科学版）2012，Vol.34Issue(5)：1-9,9.DOI:10.3863/j.issn.1674-5086.2012.05.001
巴西被动大陆边缘盆地群大油气田形成条件
Build up Conditions of Basin Group Large Oil Gas Field of Passive Continental Margin of Brazil Offshore
摘要
Abstract
Based on the evolution of the tectonic plate and pregeography, the passive continental margin basins on the east coasts of Brazil experienced three prototype phases. Berremian intracontinental rift megasequence in lower cretaceous, comprising lacustrine sediments overlying Neocomian basalts, Aptian intercontinental rift basin, in which the laqoon transitional megasequence deposited, including two sedimentary units: the lower, mostly composed by carbonate and the upper represented by halite, and the drift phase, passive continental margin basin from Albian until the present-day, deposited with the marine megasequence. The Lower Cretaceous lacustrine calcareous black shale is the main source rocks of the giant oil and gas fields. The reservoirs include two sects: lower laqoon carbonatea nd upper, Tertiary and Cretaceous turbidites. The carbonate reservoirs is sealed by halite, while the turbidites are preserved by marine shale. The lower Cretaceous lacustrine source rocks starts to generate the oil and gas from Eocene-Miocene formed "double insurance" type models of giant oil and gas fields. If no salt windows existing, hydrocarbons migrated vertically along faults and are trapped mainly in the pre-salt carbonates. If salt windows exiting, hydrocarbons are accumulated in Upper Cretaceous-Tertiary turbidites which are packaged by marine facies shale .关键词
巴西东海岸/被动大陆边缘盆地/原型盆地/大油气田/成藏模式Key words
East coast of Brazil/passive continental margin basins/prototype basin/giant gas fields/model of hydrocarbons accumulation分类
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温志新,童晓光,张光亚,王兆明,梁英波..巴西被动大陆边缘盆地群大油气田形成条件[J].西南石油大学学报（自然科学版）,2012,34(5):1-9,9.基金项目
国家大型油气田与煤层气开发项目(2008ZX05028). （2008ZX05028）
