【作者】 李彦恒；

【导师】 金瞰昆； 袁同兴；

【作者基本信息】 河北工程大学 ， 矿产普查与勘探， 2007， 硕士

【摘要】 鄂尔多斯盆地是我国的一个巨型能源矿产聚集盆地,不同时代、不同类型的多种能源矿产同盆共存,为地质工作者从事科学研究提供了一个内容丰富的大型试验场。本文以国家973项目《多种能源矿产共存成藏(矿)机理与富集分布规律》(2003CB214600)为依托,通过对鄂尔多斯盆地能源矿产地球化学特征的研究获得了以下认识:1、鄂尔多斯盆地蕴藏着丰富的煤、石油、天然气和砂岩型铀矿等多种能源矿产。在纵向上,煤聚积于石炭--二叠系和侏罗系,石油和铀矿主要分布在侏罗系,天然气则储集在奥陶系和二叠系。在平面上,石油位于盆地中南部,铀矿位于盆地边部,天然气和煤炭资源在全盆地均有分布。在盆地发展演化过程中,在不同的构造单元叠置了不同的能源组合类型,包括煤、天然气与铀组合,煤与天然气组合,煤与石油、天然气组合,煤、石油、天然气与铀组合等4种组合类型。2、通过对区内50块样品的色-质谱分析、干酪根元素及生物标志化合物分析,表明含矿目的层有另外的高成熟度有机质(油气等)介入以及较严重的生物降解,说明铀矿化过程中,有机质作用特征明显。3、微量元素在盆地内横向和纵向上显示出不同的地球化学特征,东胜区亲铁元素显示出富集状态,而镇原区则呈现出了贫化特征;对区内稀土元素分析表明体现出轻重稀土中等分馏程度,并且轻稀土元素之间发生了较强的分馏作用。4、铀元素的富集与深部有机流体以及有机质有着密切的关系,有机质及微生物、细菌等在砂岩型铀矿床形成过程中起到了相当重要的作用。有机质在铀富集成矿过程中起着还原作用、吸附作用、阳离子交换作用以及配位作用;微生物则主要起到了吸附和还原的作用。更多还原

【Abstract】 Ordos Basin is one of the greatest Energy Mineral Deposits basins in China. Different epoch and kinds of Energy Mineral Deposits are concurrent here, so Ordos Basin provides a rich large-scale Experimental Site for geologic research. This paper based on the national project 973-“Several Kinds of Energy Mineral Concurrent And Accumulation Mechanical And Deposit Distribution”(2003CB214600), and got the recognitions through the research on Ordos Basin Energy Mineral Geochemical characters as follows:1. Ordos Basin was rich in coal, oil, gas, sandstone-type uranium deposit and other energy resources. On vertical, coal accumulated in the Perm-Carboniferous and Jurassic, oil and uranium deposited mainly in the Jurassic, and gas reservoir in the Ordovician and Permian. On horizontal, oil was located in the center and southern of the basin, uranium located in the edge, gas and coal were distributed the entire basin. In the process of the basin evolution, different types of energy overlaid on different tectonic units, including coal, gas and uranium combination, coal and gas combination, coal, oil and gas combination, and coal, oil, gas and uranium combination.2. Through the GC-MS analysis, Kerogen elements and biomarker compounds analysis, showed there was other high maturity degree organic matter (oil and so on) to intervene and more serious biodegradable in the purpose ore layer, and noted that in the process of uranium mineralization, the role of organic was obvious.3.Trace elements displayed different geochemical characteristics in the horizontal and vertical of the basin, siderophile elements showed enrichment in Dongsheng District and poor in Zhenyuan District. Rare-earth elements analysis showed that heavy and light rare-earth elements medium fractionation, and there was strong fractionation among the light rare-earth elements.4. Uranium enrichment had the close relationship with the deep organic fluid and organic. Organic, microbial and bacteria played an important role in the process of sandstone-type uranium deposits. Organic played a role of reduction, adsorption, cation exchange and coordination and microbial main played a role of absorption and reduction in the process of uranium enrichment.更多还原