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沉积学报  2015 

鄂尔多斯盆地陇东地区长9油层组油源分析

DOI: 10.14027/j.cnki.cjxb.2015.05.018, PP. 1023-1032

Keywords: 鄂尔多斯盆地,原油,油源分析,聚类分析,运移路径

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Abstract:

鄂尔多斯盆地陇东地区长9油层组油源问题是制约该地区勘探进程的因素之一。为了解决这一问题,首先依据长9原油地球化学资料对原油成因进行了研究;针对长7烃源岩和长9烃源岩地球化学特征相似性导致难以评价两种烃源岩对长9油层组成藏贡献的问题,本文基于聚类分析理论,利用灵敏的生物标志化合物参数计算、分析了长9原油与长7烃源岩和长9烃源岩间的相关性和类属关系,同时结合陇东地区地质特征探讨了长9原油成藏可能的运移路径。研究结果表明长9原油形成于弱氧化-弱还原的淡水湖泊环境,原油母质主要由水生生物和高等植物构成,原油已经成熟;长9原油主要来自长7烃源岩,部分来自长9烃源岩;长7烃源岩和长9烃源岩生成的原油沿北东-南西向运移。烃源岩较强的生排烃能力、良好的疏导体系和有利的砂体展布对长9石油成藏起着至关重要的作用。

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