准噶尔盆地东缘侏罗系砂岩型铀矿成矿条件与找矿方向

Metallogenic conditions and prospecting targeting of the Jurassic sand type uranium deposits on the eastern margin of Junggar Basin

准噶尔盆地是中国煤炭、石油、天然气、铀矿等资源的重要勘查基地,其中砂岩型铀矿的找矿方向和找矿突破一直是盆地铀资源勘查的难点。以煤田钻孔资料"二次开发"作为铀矿勘查新思路,对盆地东缘某地区收集的煤田钻孔测井成果开展了综合研究。在中侏罗统头屯河组中圈定规模较大且连续的放射性异常,有较好的找矿前景。对大地构造条件、地层—岩相、岩性、古气候与地貌、古水文地质等进行系统研究,择优重点选择煤田铀异常孔进行钻孔验证,发现了具有工业意义的铀矿体,指出了下一步勘查工作的方向,开创了准噶尔盆地砂岩型铀矿勘查工作的新局面。

Junggar Basin has rich coal, oil, natural gas and uranium resources, but the targeting and breakthrough of the prospecting for sandstone-type uranium deposits remain a difficult problem in uranium resources exploration of this basin. Using the new idea of employing the data of coalfield drilling for second-round development of uranium resources proposed by Tianjin Center of China Geological Survey, the authors conducted comprehensive research on the coalfield logging data collected from a certain area on the eastern margin of the basin. The large-sized and continuous radioactive anomalies were dehneated in the middle Jurassic Tuntouhe Formation, thus showing favorable ore-searching prospect. Based on systematic research on the sandstone-type uranium metallogenic conditions, such as tectonic conditions, lithofacies and lithologic character, paleochmate-topography and hydrogeology, the authors verified key coal anomaly drill holes and determined several drill holes intersecting industrial uranium reserves or mineralization and indicated the targets for the next step exploration work, thus opening up a new prospect for the exploration of sandstone-type uranium deposits in Junggar Basin.