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研究伊犁盆地南缘洪海沟地区主力含铀层系——中侏罗统西山窑组上段的沉积特征,为该区下一步铀矿地质勘查提供理论依据。根据沉积结构、岩性组合、沉积韵律、沉积构造、测井曲线等特征,认为西山窑组上段在洪海沟地区主要发育曲流河沉积。根据连井剖面特征,以及砂体厚度、砂地比等沉积特征在平面上的变化,洪海沟地区西山窑组上段沉积相的平面分布规律明显,中间为沿北西—南东向展布的曲流河道,河道南部为河漫沼泽,北部为河漫滩。综合研究区岩性、构造、铀源等成矿条件,西山窑组上段赋存的铀矿体主要受河道砂体展布方向、河道砂体厚度、砂体粒度、砂体中的泥岩夹层、地层产状等因素控制。
The sedimentary characteristics of the upper uranium-bearing layer of the Middle Jurassic Xishanyao Formation in Honghaigou area, southern margin of Ili Basin, are studied to provide the theoretical basis for the next uranium prospecting in the area. According to sedimentary structure, lithologic assemblage, sedimentary rhythm, sedimentary structure and logging curve, it is considered that the upper part of Xishanyao Formation mainly develops meandering river in Honghaigou area. According to the characteristics of continuous well section and the variation of sedimentary characteristics such as sand thickness and sand ratio in the plane, the distribution of sedimentary facies in the upper section of Xishanyao Formation in Honghaigou area is obvious. The middle is the meandering River, the river south of the river marsh, the northern river floodplain. According to lithogenic, tectonic and uranium source conditions in the integrated study area, the uranium ore bodies in the upper part of Xishanyao Formation are mainly affected by the distribution direction of channel sand body, channel sand body thickness, sand body grain size, mudstone interlayer in sand body, Stratigraphy and other factors control.