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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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里奥穆尼盆地上白垩统海相烃源岩地球化学特征及生烃潜力
Keywords: 地球化学特征,显微组分,生烃潜力,上白垩统,里奥穆尼盆地
Abstract:
？里奥穆尼盆地油气勘探目前处于低勘探程度，盆地主力烃源岩主要是aptian-albian阶富有机质泥页岩和泥灰岩。然而，新区新钻井揭示上白垩统发育厚层灰色—灰黑色泥页岩，却从未引起足够关注。经详细的地球化学研究表明，该套泥页岩具有中等有机质丰度（toc值为0.6%～2.24%，平均为1.03%），干酪根类型主要为ⅱ型，其次是ⅲ型，处于早成熟—成熟阶段；虽然显微组分证实存在明显的陆源有机质输入，然而干酪根类型却以ⅱ2型为主，这可能是由于河流远距离搬运来的陆源有机质与海洋原地有机质混合，在搬运和沉积过程中遭受较强烈微生物改造，并且在海洋底层缺氧水体中，分散在矿物基质中得以保存，既有明显的倾油性，又有倾气性。通过盆地模拟表明，上白垩统turonian阶海相烃源岩在始新世进入生油窗，至今仍处于主生烃期，该套烃源岩可能在向西斜坡凹陷区已经生成油气并聚集成藏。因此，上白垩统海相泥页岩是一套具有一定生烃潜力的烃源岩，特别是厚度较大的turonian阶泥页岩是里奥穆尼盆地不可忽视的海相烃源岩。？
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