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首页> 外文期刊>AAPG Bulletin >Tectono-sedimentary evolution and petroleum systems of the Mundau subbasin: A new deep-water exploration frontier in equatorial Brazil
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Tectono-sedimentary evolution and petroleum systems of the Mundau subbasin: A new deep-water exploration frontier in equatorial Brazil

机译：Mundau Subbasin的构成沉积演化与石油系统：赤道巴西新型深水勘探边疆

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摘要

The Brazilian equatorial margin (BEM) evolved in response to transform motion between Brazil and Africa. In 2012, Petrobras drilled the Pece ' m well in the Mundau subbasin (Ceara Basin) of the BEMto record the first deep-water oil discovery in the region. This work investigates the deep-water evolution of the Mundau subbasin focusing on its structural and sedimentary evolution, and characterizes the petroleum systems in this new exploration frontier. For such purposes, poststack seismic reflection, borehole, and geochemical data were used. Three tectono-stratigraphic sequences representing synrift (Mundau Formation), transitional (Paracuru Formation), and drift strata (Ubarana Formation) were divided into seven seismic units. Different tectonic domains were interpreted: proximal, distal, and Romanche Fracture Zone. Typical structures of transform margins, such as marginal ridges and marginal plateaus, were not identified in the Mundau ' subbasin. Instead, the subbasin was predominantly deformed by transtensional movements. The Mundau and Paracuru Formations are mature within the oil window, whereas the Ubarana Formation is immature. Main reservoir intervals consist of approximately 1-m (similar to 3.28-ft)-thick intercalations of sandstone between shales, siltstones, and marls. The seal rocks comprise shales in the Ubarana Formation, whereas the hydrocarbon trap is related to an unconformity and a normal fault. This work concludes that the Paracuru Formation is the main source and reservoir in the deep-water Mundau ' subbasin, effectively comprising a ParacuruParacuru petroleum system. The results have significant implications for petroleum exploration in the BEM by proposing a developed transitional petroleum system in the distal parts of northeastern Brazil.
机译：巴西赤道边缘（BEM）响应于巴西和非洲之间的变换运动而演变。 2012年，Petrobras钻了在Mundau Subbasin（Ceara Basin）的PECE井里记录该地区的第一个深水油发现。这项工作调查了Mundau亚巴巴辛的深水演变，重点关注其结构和沉积演化，并在这个新的探索边疆的石油系统的特征。用于此目的，使用后壁壁反射，钻孔和地球化学数据。三个构造 - 地层序列代表同步（Mundau形成），过渡性（副宫形成）和漂移层（Ubarana Mablation）分为七个地震单位。不同的构造域被解释：近端，远端和romanche骨折区。在Mundau'Sabbasin中未发现转换边距的典型结构，例如边缘脊和边缘平稳。相反，亚巴巴辛主要因触发运动而变形。 Mundau和帕鲁科的地层在油窗口中成熟，而Ubarana形成是不成熟的。主储层间隔由Haales，Siltstones和Marls之间的砂岩约1米（类似于3.28英尺）的间隔组成。密封岩在uBarana形成中包括Shales，而碳氢化合物陷阱与无关和正常故障有关。这项工作得出结论认为，帕鲁科形成是深水Mundau'子巴西的主要来源和水库，有效地包括帕拉科拉科鲁鲁石油系统。结果通过在巴西东北部的远端部分提出发达的过渡石油系统，对BEM的石油勘探具有显着影响。

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