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Contrasting Structural Styles, Brazilian and West African South Atlantic Volcanic and Nonvolcanic Margins: The Impact on Presalt Petroleum Systems

机译:对比结构款式,巴西和西非南大西洋火山和非瓦尔裔边缘:对预设石油系统的影响

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The South Atlantic presalt petroleum system has unique elements which are related to the basin bounding structural fabric, accommodation space and climatic conditions. The development of both high total organic carbon lacustrine source rocks and hypersaline/hyperalkaline microbial carbonates requires sequestration of these basins from marine conditions. Sequestration is accomplished by an outer-high which was isostatically elevated by magmatic under-plating. This magmatic under-plating is occurs along the margin from the Santos Basin to the Espírito Santo Basin and the conjugate Kwanza Basin. Where the outer high is absent, such as in the Brazilian Pelotas Basin and Namibian basins, the presalt petroleum system fails to develop. In Gabon where under-plating and basin sequestration occurs, a Brazilian style presalt system fails to develop due to high clastic influx. Gabon lacks the microbial hypersaline carbonate reservoir. Similar Brazilian style presalt petroleum systems are likely however, to occur on other passive margins where similar structural styles create a sequestered basin. These basins should occur in regions which are transitional from classic volcanic margins to true nonvolcanic margins. Through better understanding of the Brazilian presalt geodynamic setting we can position ourselves to identify new basins with similar petroleum systems which have created the giant Brazilian presalt discoveries.
机译:南部大西洋保证利石油系统具有独特的元素,与盆地边界结构织物,住宿空间和气候条件有关。高总有机碳曲线源岩系和过氧化碱/甲醛微生物碳酸盐的发展需要从海洋病症中封存这些盆地。通过外高,通过岩浆底板等静电升高,完成螯合。这种岩石底层沿着Santos盆地的边缘发生到EspíritoSanto盆地和共轭Kwanza盆地。在外部高的情况下,如在巴西Pelotas盆地和纳米比亚盆地中,预设石油系统未能发展。在发生底层和盆腔隔离的加蓬中,由于高碎片流入,巴西风格的预公标系统未能发展。加蓬缺乏微生物高碱碳酸盐储层。然而,类似的巴西风格的预付费石油系统很可能发生在类似的结构风格产生螯合盆地的其他被动边缘。这些盆地应该发生在从经典的火山边缘到真正的非寄生余量过渡的地区。通过更好地理解巴西预报Geodynumic设置,我们可以定位自己,以确定具有类似石油系统的新盆地,这些盆地已经创造了巨型巴西普拉特发现。

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