| 鄂尔多斯盆地陇东地区长9油层组油源分析 |
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| 引用本文： | 赵阳,姚泾利,段毅,吴应忠,曹喜喜,徐丽,陈珊珊.鄂尔多斯盆地陇东地区长9油层组油源分析[J].沉积学报,2015,33(5):1023-1032. |
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| 作者姓名： | 赵阳 姚泾利 段毅 吴应忠 曹喜喜 徐丽 陈珊珊 |
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| 作者单位： | 1.甘肃省油气资源研究重点实验室/中国科学院地质与地球物理研究所油气资源研究重点实验室 兰州 730000; |
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| 基金项目： | 甘肃省重点实验室专项，国家自然科学基金 |
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| 摘 要： | 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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| 关 键 词： | 鄂尔多斯盆地 原油 油源分析 聚类分析 运移路径 |
| 收稿时间： | 2014-07-23 |
Oil-source Analysis for Chang-9 Subsection (Upper Triassic)of Eastern Gansu Province in Ordos Basin |
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| Abstract: | The problem of oil-source for Chang-9 subsection of eastern Gansu province in Ordos Basin is one of factors which restrict the process of exploration in the area. In order to solve it, the genesis of the crude oil from the Chang-9 is firstly studied by geochemical testing data of the crude oil. The similar geochemical characteristic of Chang-7 source rock and Chang-9 source rock results lead to that it is hard to evaluate the contribution of the two kinds of source rock to the Chang-9 reservoir. So the correlation coefficients and the category relations between the crude oil and the two kinds of source rock are calculated and analized by some sensitive biomarker parameters on the basis of Cluster Analysis Theory, at the same time the migration pathways of the crude oil are put forward in combination with geology datas. This study shows that the crude oil is mature and formed under weak oxidation-weak deoxidation environment of freshwater lakes, of which matrixes are mainly from aquatic organisms and higher plant. Furthermore, the crude oil is mostly derived from Chang-7 source rock and from the Chang-9 source rock partially. The crude oil migrates along with directon of NE-SW. It is the great ability of hydrocarbon-generation and hydrocarbon-expulsion, good migration pathway and available sandstones distribution that play a critical role in forming Chang-9 reservoir. |
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| Keywords: | Ordos Basin crude oil oil-source analysis cluster analysis migration pathway |
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