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地质学报  2004 

东营凹陷沙河街组湖相烃源岩的组合特征

, PP. 416-427

Keywords: 烃源岩,组合特征,波动湖相沉积,非均质性,东营凹陷

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Abstract:

古近系沙河街组是东营凹陷最重要的成藏组合。在前人研究基础上,系统采集该组600余块烃源岩样品和30个油田186个原油样品,分别进行了多项有机地球化学测试。结合其沉积序列和地球化学分析结果,将沙河街组烃源岩划分为咸水湖相(沙四段上部)、半咸水深湖相(沙三段下部)和淡水湖相-三角洲(沙三段中部)三种成因类型,它们分别对应欠充填、平衡充填和过充填的湖泊类型,代表了陆相断陷盆地烃源岩三种最基本的成因模式;并发现沙河街组烃源岩存在强烈的非均质性,尤其在平衡充填过程中表现更为突出,这种非均质性与湖平面的升降变化密切相关,据此提出了波动湖相沉积。通过深入的油-源对比工作,确立了咸水湖相和半咸水深湖相烃源岩为东营凹陷的主力源岩。还探讨了有机质的赋存状态和油气运移方式,指出咸水湖相烃源岩形成的油气以侧向运移为主,形成的油气藏分布在盆地的边缘;半咸水深湖相烃源岩形成的油气以垂向运移为主,形成的油气藏主要分布在盆地的中心,油藏类型主要为隐蔽性油气藏

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