TECTONIC EVOLUTION AND PETROLEUM EXPLORATION PROSPECT IN RIO MUNI BASIN, EQUATORIAL GUINEA
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摘要: 应用盆地原形分析、区域地震资料解释和石油地质综合分析等方法,探讨了赤道几内亚里奥穆尼盆地构造演化和成藏条件。研究结果表明,该盆地构造演化经历了裂谷、过渡—漂移和裂后被动大陆边缘3个阶段,主要充填了中新生代沉积地层,中生界白垩系主要发育2套烃源岩,为裂谷期的湖相泥页岩和过渡—早期漂移期的海相泥页岩,已发现的油气主要储集在上白垩统浊积砂体。盐构造和重力滑动构造是油气成藏的主控因素,在区域上,油气主要分布在盆地的中带,该带勘探程度低,成藏条件优越,是油气聚集的有利场所,尤其盐构造与重力滑动构造区具有较大油气勘探潜力。Abstract: Tectonic evolution and reservoir forming conditions of the Rio Muni Basin, Equatorial Guinea are studied in this article using the methods of prototype basin analysis, seismic data interpretation and petroleum geological analysis. The results show that the tectonic evolution of the region can be divided into three stages:rifting, transition-drifting and passive continental margin formation. The basin is mainly filled with Cenozoic and Mesozoic sediments. There are two suites of Cretaceous hydrocarbon source rocks developed:lacustrine argillutite during the rifting stage and marine argillutite during the transition-early drifting stage. Hydrocarbon accumulation is mainly related to salt structure and gravity sliding. Oil and gas are mainly accumulated in the middle zone with excellent reservoir forming conditions, which is low in exploration degree.
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