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OALib Journal期刊
ISSN: 2333-9721
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湘中坳陷涟源凹陷烃源岩油气地球化学特征
Keywords: 生烃能力,有机碳含量,镜质体反射率,二次生烃,涟源凹陷
Abstract:
？湘中坳陷涟源凹陷烃源岩类型复杂，包括碳酸盐岩、泥岩和煤层。根据涟源凹陷大量露头样品的残余有机碳含量、氯仿沥青“a”、镜质体反射率和包裹体等地球化学实验数据，分析了泥盆系—二叠系烃源岩的有机质丰度、类型及热演化程度。结果表明涟源凹陷的烃源岩总体演化程度均已达到过成熟阶段，油气资源以干气为主。针对烃源岩样品的热演化程度高、丰度低的特征，在了解烃源岩地球化学特征及其与构造运动匹配关系的基础上，探讨了涟源凹陷二次生烃的可能性，最终认为涟源凹陷泥盆系—二叠系烃源岩具有中等级别的生烃能力，并在二叠系的龙潭组煤层有二次生烃的可能。
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