“煤铀兼探”找矿新思路在云南的初次应用——以滇西户撒盆地铀矿勘探为例

Coal-uranium exploration in the Husa Basin, western Yunnan: A new approach

关键词:  煤铀兼探  砂岩型铀矿  潜在储铀层  户撒盆地  滇西

Key words:  coal-uranium exploration  sandstone-type uranium deposit  potential uranium reservoirs  Husa Basin  western Yunnan

摘要:

通过对滇西户撒盆地煤田资料二次开发利用,文章首次提出"潜在储铀层"的概念,即煤田等勘探钻孔测井资料中自然伽马值显示高于50γ(或3.5PA/kg或150API或12.6纳库(n·C)/Kg·小时)时所对应的砂岩、砾岩层,并筛查出主要赋存在新近系芒棒组一至三段的潜在储铀层40层。自然伽马异常等厚图与等值线图指示盆地北东部姐来-小寨地区、中部曼统-曼燕地区、南西部帕董-老汪寨地区可作为首选钻探验证靶区,验证孔当优先部署在以上区域。芒棒组一、二段因赋存的潜在储铀层数量多、伽马异常厚度较大、伽马异常值高,赋矿潜力大,可作为重点验证层位。

Abstract:

With the aid of the coalfield data from the Husa Basin, western Yunnan, the concept "potential uranium reservoirs" is proposed for the first time in the present paper, and referred to as the sandstone or conglomerate horizons whose natural gamma-ray values are greater than 50γ(or 3.5 PA/kg or 150API or 12.6 (n. C)/kg. hour). Up to now, 40 layers of potential uranium reservoirs have been delineated in the first to third members of the Neogene Mangbang Formation, As indicated by the isopach map and isoline map showing natural gamma-ray (γ) anomalies, the Jielai-Xiaozhai zone in the northeastern part, the Mantong-Manyan zone in the central part, and the Padong-Laowangzhai zone in the southwestern part of the Husa Basin may be selected as the preferred targets for future drilling, and the first and second members of the Mangbang Formation may be selected as the key horizons for future drilling because of large numbers of the potential uranium-bearing beds, greater thickness and higher values of the natural gamma-ray (γ) anomalies in the potential uranium reservoirs in the Husa Basin.