基于聚类分析的氧化带空间发育控制参数——以伊犁盆地洪海沟砂岩型铀矿为例

氧化流体是砂岩型铀矿形成的核心,沉积的非均质性是控制氧化带和铀矿体空间分布的重要因素,因此,查明制约氧化带发育的砂体参数,对铀矿勘查至关重要。本文以洪海沟西山窑组上段为研究对象,通过大量钻孔资料的统计分析,采用聚类分析和相关性分析,提取影响氧化带和铀矿体空间分布的关键因子,并探讨其影响机制。结果表明,洪海沟矿床西山窑组上段主河道砂体厚度稳定连通性好,砂体厚度和砂体比两个参数与氧化流体的大规模发育相关性最好；铀矿化钻孔砂体与高含砂率、较大的夹隔层厚度等两类参数均有关；砂体的均质性和非均质性则直接决定着铀矿体的空间定位。均质性较高的厚大砂体控制着氧化带的发育,围绕其边缘的非均质性砂体则直接定位铀矿体的产出。本文的研究结果对砂岩型铀矿氧化带的探索和矿体定位预测具有重要的指导意义。

Study on Controlling Parameters of Spatial Distribution of Oxidation Zone Based on Cluster Analysis: A Case of Honghaigou Sandstone Type Uranium Deposit in Yili Basin

Oxidation fluid is the core of the formation of sandstone type uranium deposit, and the heterogeneity of sand body is a key factor to control the distribution of oxidation zone and uranium orebodies. Therefore, it is important for uranium exploration to determine the sand body parameters that restrict the development of oxidation zone. Taking the upper member of Xishanyao Formation in Honghaigou deposit as the object, the key factors affecting the spatial distribution of oxidation zone and uranium ore body will be extract from the statistical analysis of a large number of drilling data by cluster analysis and correlation analysis, and then to explore the influencing mechanism. The results show that the two parameters of sand body thickness and sand body ratio have the best correlation with the large-scale development of oxidation fluid in the main channel sand body. The sand bodies of uranium mineralized boreholes are related to two kinds of parameters: high sand content, large number and thickness of interlayer. The thick sand body with high homogeneity controls the development of oxidation zone, and the heterogeneous sand body around its edge directly locates the occurrence of uranium ore body. The research results of this paper have important guiding significance for exploration of oxidation zone and ore body location prediction of sandstone type uranium deposit.