1. 长江大学地球科学学院
2. 中国地质大学(武汉)资源学院
3. 宁夏回族自治区矿产地质调查院(自治区矿产地质研究所)
纸质出版:2025
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杨俊, 徐清海, 母彩霞, 等. 鄂尔多斯盆地西南缘侏罗系延安组油页岩发育特征及其古环境恢复[J]. 地质科技通报, 2025,44(3):182-196.
杨俊, 徐清海, 母彩霞, et al. 鄂尔多斯盆地西南缘侏罗系延安组油页岩发育特征及其古环境恢复[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 182-196.
杨俊, 徐清海, 母彩霞, 等. 鄂尔多斯盆地西南缘侏罗系延安组油页岩发育特征及其古环境恢复[J]. 地质科技通报, 2025,44(3):182-196. DOI: 10.19509/j.cnki.dzkq.tb20240171.
杨俊, 徐清海, 母彩霞, et al. 鄂尔多斯盆地西南缘侏罗系延安组油页岩发育特征及其古环境恢复[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 182-196. DOI: 10.19509/j.cnki.dzkq.tb20240171.
鄂尔多斯盆地西南缘侏罗系延安组发育多套与煤伴生和非伴生的油页岩,但是长期以来对该区油页岩的特征及其沉积环境研究相对缺乏。通过对研究区钻井岩心进行取样,开展低温干馏、岩石热解、主微量元素测定和气相色谱等实验,对油页岩的工业指标、地球化学特征和沉积古环境进行分析。研究表明,研究区油页岩含油率为3.8%~6.7%,灰分质量分数为44.81%~75.58%,全硫为0.31%~2.29%,发热量平均值为11.95 kJ/g;测井曲线呈现高伽马、高电阻率和负异常自然电位特征,明显区别于煤层和泥岩;有机质类型以Ⅱ2型为主,有机质丰度较高,整体处于未熟-低成熟阶段;总体属于中品质、硅质灰分、特低硫的油页岩。主量元素以SiO
2
和Al
2
O
3
为主,平均质量分数分别为48.26%和17.57%,微量元素Sr、Th和U富集,Ni、V和Ba亏损,元素分析表明研究区有较多含钾矿物和镁铁成分,且稳定组分较高。通过古环境元素标志和饱和烃色谱分析认为有机质主要来源于混合有机质,古生产力中等,且沉积环境具有独特性,属于温暖湿润的贫氧陆相淡水洼地环境。分析各环境因素显示,氧化还原条件是有机质富集的主要影响因素,进而建立了不同沉积时期的延安组油页岩沉积演化模式。研究成果为鄂尔多斯盆地西南缘侏罗系延安组油页岩勘探开发提供了重要理论指导和技术支撑。
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