中文摘要：

布尔加地区位于吐哈盆地西北缘,中下侏罗统水西沟群是该区砂岩型铀矿床的主要含矿层位,具有较好的产铀前景。通过野外地质调查、钻孔及野外露头取样、室内镜下观察以及结合前人的研究成果,对该区的成矿砂岩的岩石学特征进行研究,发现目的层砂岩结构成熟度较低,具有搬运距离短,沉积速度快的特点。物源主要来自二叠系火山碎屑岩,砂岩的致密跟成岩作用和后期构造运动有关。砂岩的物性影响氧化流体的运移,与铀成矿紧密相关。

英文摘要：

The Buerjia area is located in the northwest margin of Tuha basin,the Shuixigou Group of LowerMiddle Jurassic is the main stratigraphic position of sandstone type uranium deposit in this area,and has a good prospect of the formation of uranium ore. By geological surveying in the field,sampling at the drilling and the field outcrop,microscopic observation. Combining previous research results,we study the lithology characteristics of the metallogenic sandstone in Buerjia area,and find out that the purpose sandstone has a low maturation of texture and has the properties of short transport distance and fast deposition rate. The Source was proved mainly originated from the Permian volvanivlastic rocks,the density of the sandstone related to the diagenesis and the regional tectonic movements at the later period. The properties of the purpose sandstone influenced the migration of the oxidizing fluid,associated with uranium mineralization closely.