鄂尔多斯盆地黄陵地区直罗组有机地球化学特征及其与铀成矿关系
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核工业北京地质研究院,核工业北京地质研究院,核工业北京地质研究院,核工业北京地质研究院,核工业北京地质研究院,核工业北京地质研究院,核工业北京地质研究院,核工业北京地质研究院

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本文为核工业地质局生产中科研项目(编码:201586),国家重点基础研究发展计划“973”项目(编号:2015CB453004)和中核集团集中研发项目“鄂尔多斯盆地南部砂岩型铀矿关键因素识别与靶区优选”(编号:地LTD1601-3)共同资助的成果。


The Organic Geochemical Characteristics of the Zhiluo Formation and Its Relationship with Uranium Mineralization in the Huangling Area, Ordos Basin
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Beijing Research Institute of Uranium Geology,Beijing Research Institute of Uranium Geology,Beijing Research Institute of Uranium Geology,Beijing Research Institute of Uranium Geology,Beijing Research Institute of Uranium Geology,Beijing Research Institute of Uranium Geology,Beijing Research Institute of Uranium Geology,Beijing Research Institute of Uranium Geology

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    摘要:

    鄂尔多斯盆地东南部直罗组油气作用明显,区域铀成矿与褪色蚀变关系密切。本文在铀矿化发育较密集的黄陵地区开展了直罗组有机地球化学特征及其与铀成矿关系研究。通过饱和烃气象色谱分析,可见有机质正构烷烃主峰碳位于C15~C22之间,(C21+C22)/(C28+C29)值范围为072~2608,∑C21-/∑C22+值分布在088~639之间,Pr/Ph值分布在047~085之间,OEP值分布在087~108之间,CPI值分布在104~122之间,指示烃源岩有机质处于成熟的热演阶段,油气主要来源于三叠系延长组盐湖相的沉积母质。研究区三叠系延长组湖相烃源岩的生烃高峰期与含铀目的层沉积成岩以来地层缺失期及铀成矿期基本吻合,生成的油气既可为铀成矿提供还原能力,又可以避免已形成的铀矿体遭受后期氧化改造。

    Abstract:

    The southeastern Erdos Basin presents strong phenomenon of oil and gas development. It seems that regional uranium mineralization is closely related with fade alteration. This study carried out study of organic geochemical feature of the Zhiluo Formation and its relationship with uranium mineralization in the extensively mineralized Huangling area. The gas chromatography analysis of saturated hydrocarbons shows that the peak carbon number of nalkanes in organic matter belongs to C15~C22;,with C21+ C22)/(C28+C29)from 0.72 to 26.08; ∑C21-/∑C22+of 0.88~6.39; Pr/Ph of 0.47~0.85; OEP of 0.87~1.08 and CPI of 1.04~1.22. All this data indicate that hydrocarbon source rocks are in the stage of maturation, with oil and gas organic matter mainly from lacustrine sedimentary parent material in the Triassic Yanchang Formation. The hydrocarbon generation peak of lacustrine source rocks in the Triassic Yanchang Formation in the study area is in agreement with the time of missing strata hosting uranium mineralization since the formation of Ubearing sequences. The generated oil and gas can not only provide the reduction ability for uranium mineralization,but also can make the formed uranium ore bodies avoid reconstruction by the late oxidation.

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张字龙,范洪海,蔡煜琦,赵兴齐,刘红旭,贺锋,李平,杨梦佳.2016.鄂尔多斯盆地黄陵地区直罗组有机地球化学特征及其与铀成矿关系[J].地质学报,90(12):3408-3423.
ZHANG Zilong, FAN Honghai, CAI Yuqi, ZHAO Xingqi, LIU Hongxu, HE Feng, LI Ping, YANG Mengjia.2016. The Organic Geochemical Characteristics of the Zhiluo Formation and Its Relationship with Uranium Mineralization in the Huangling Area, Ordos Basin[J]. Acta Geologica Sinica,90(12):3408-3423.

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  • 收稿日期:2016-12-15
  • 最后修改日期:2016-12-15
  • 在线发布日期: 2017-01-13