OALib Journal期刊
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南大西洋深水盆地的构造沉积演化及含油气系统
Keywords: 大西洋,深水盆地,构造沉积演化,张裂作用,含油气系统
Abstract:
?南大西洋两岸的被动大陆边缘盆地是当今深水油气勘探开发的热点区域,其构造沉积作用及含油气条件受控于大西洋的裂开、持续扩张漂移和气候、海平面变化的影响。大西洋边缘盆地的构造演化可以分为前裂谷期、裂谷期、过渡期和漂移期(漂移期又可分为海侵和海退2个时期);裂谷期发育陆相河流—湖泊—三角洲相沉积体系,过渡期发育阿普第期蒸发盐岩系,漂移期发育海相碳酸盐岩和深水碎屑岩沉积体系。以阿普第期蒸发盐岩系为界,南大西洋深水盆地发育盐下和盐上2套含油气系统,盐下层油气系统烃源岩为湖相泥(页)岩,储层为河流—三角洲相及滨岸相砂岩,盖层为阿普第期蒸发盐岩;盐上层油气系统的主力烃源岩主要是上白垩统海相泥(页)岩,储层以浊积砂岩储层为主,盖层为各个时期发育的泥(页)岩。南大西洋盆地张裂过程的差异性控制了层序发育、蒸发盐岩的分布和含油气潜力。
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