陆相页岩与泥岩特征对比及其意义——以鄂尔多斯盆地延长组7段为例
发布时间：2019-06-04 17:28
【摘要】：鄂尔多斯盆地延长组7段富含大量页岩油,但由于对页岩与泥岩特征差异缺乏深入了解,阻碍了该层系页岩油的有效开发。为此,采用岩心观察、薄片鉴定等直接观察手段与XRD、Rock-Eval、TOC、氯仿沥青"A"抽提、主微量元素等实验相结合,对研究区长7段页岩和泥岩的岩石学、矿物学、有机地球化学与无机地球化学特征进行了深入研究。结果表明:长7段页岩的颜色较深,发育明显页理,切面光滑,而泥岩不具有纹层和页理,断口不整齐且切面粗糙;页岩的有机质以顺层富集为主,泥岩有机质以分散赋存为主;页岩的粘土矿物含量较高,泥岩的石英含量较高;页岩的TOC平均值为18.5%,约为泥岩的5倍,生烃潜量是泥岩的5~8倍;氯仿沥青"A"组分对比显示页岩含较多的芳烃,泥岩则含有较多的饱和烃;页岩沉积水体的盐度相对泥岩略低,且水深相对较浅。长7段页岩呈西北-东南走向分布,厚度主要为15~30 m,与泥岩呈互补式分布。页岩油"源内聚集"的特点使长7段的页岩油宏观分布受到页岩相控制。开展泥岩与页岩的对比研究,对准确预测富有机质页岩分布及指导页岩油气勘探具有重要意义。
[Abstract]:Member 7 of Yanchang formation in Ordos Basin is rich in shale oil, but the lack of in-depth understanding of the characteristics of shale and mudstone hinders the effective development of shale oil in this formation. Therefore, the petrology and mineralogy of shale and mudstone in Chang7 member of the study area were studied by combining core observation and thin slice identification with XRD,Rock-Eval,TOC, chloroform asphalt "A" extraction and main trace elements. The characteristics of organic geochemistry and inorganic geochemistry were deeply studied. The results show that the shale of Chang 7 member is dark in color, has obvious paging and smooth section, but the mudstone does not have grain and page, and the fracture surface is irregular and the section is rough. The organic matter of shale is mainly enriched by bedding, the organic matter of mudstone is mainly dispersed, the clay mineral content of shale is higher, and the quartz content of mudstone is higher. The average TOC of shale is 18.5%, which is about 5 times of that of mudstone, and the hydrocarbon generation potential is 5 鈮，
本文编号：2492876
[Abstract]:Member 7 of Yanchang formation in Ordos Basin is rich in shale oil, but the lack of in-depth understanding of the characteristics of shale and mudstone hinders the effective development of shale oil in this formation. Therefore, the petrology and mineralogy of shale and mudstone in Chang7 member of the study area were studied by combining core observation and thin slice identification with XRD,Rock-Eval,TOC, chloroform asphalt "A" extraction and main trace elements. The characteristics of organic geochemistry and inorganic geochemistry were deeply studied. The results show that the shale of Chang 7 member is dark in color, has obvious paging and smooth section, but the mudstone does not have grain and page, and the fracture surface is irregular and the section is rough. The organic matter of shale is mainly enriched by bedding, the organic matter of mudstone is mainly dispersed, the clay mineral content of shale is higher, and the quartz content of mudstone is higher. The average TOC of shale is 18.5%, which is about 5 times of that of mudstone, and the hydrocarbon generation potential is 5 鈮，
本文编号：2492876
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