内蒙古东部开鲁盆地钱家店凹陷铀矿成藏沉积因素分析  

SEDIMENTATION FACTORS ANALYSIS OF URANIUM MINERALIZATION OF QIANJIADIAN DEPRESSION,KAILU BASIN, EAST INNER MONGOLIA AUTONOMOUS REGION

作　　者：殷敬红[1] 张辉[1] 昝国军[1] 李晓晨[1] 

机构地区：[1]中油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《古地理学报》2000年第4期76-83,共8页Journal of Palaeogeography：Chinese Edition

摘　　要：内蒙古东部开鲁盆地钱家店凹陷铀矿床是辽河油田在进行外围盆地油气勘探过程中发现的伴生矿床。铀矿类型为层间氧化带砂岩型铀矿床。对该区铀矿成藏条件进行研究表明 :具备富铀物源 ,铀源充足 ;上白垩统姚家组广泛发育的辫状河流相沉积体系 ,形成了渗透性砂岩、砂砾岩与隔水性泥岩稳定的互层结构 ,铀矿主要分布在其中的中孔、中渗砂体中 ;下白垩统的生、储油层 ,为铀矿形成提供了丰富的还原剂 ;产状平缓的沉积构造背景下形成的边缘相对隆起的自流汇水盆地 ,易使含氧含铀地下水沿砂体、不整合面向盆地内有利区补给 ,在氧化 -还原界面附近铀沉淀成矿 ,为铀矿创造了进一步富集成藏的条件 ;预测该区铀矿资源为x× 10 4 t。The uranium mineral deposits in the Qianjiadian depression is the associated mineral deposits found during the oil and gas exploration in the Liaohe peripheral basins. The uranium deposits fall into the category of sandy deposits in interlayer oxidization zones. Study of the reservoir forming conditions of uranium in this area shows that the source of uranium is abundant. The widely developed braided channel deposit system in the Yaojia Formation of the Upper Cretaceous resulted in stable intercalation of permeable sandstones, glutinites, and impermeables mudstones, with the uranium distributed in the the sand bodies with a moderate porosity and permeability; and the source and reservoir of the Lower Cretaceous have provided rich reduction agents for the uranium mineral deposits. The artesian and water catch basin with relative high margin of the basin formed in the gentle structure belts, tends to make the underground water containing uranium be supplied into the favorable area along the sand body and unconformity surface. As a result of this, the uranium mineral deposit can be formed near the oxidization reduction contact, providing the conditions for the further reservoir forming. The reserve of the uraniam deposits in this region is predicted to be of x ×10 4 t.

关 键 词：沉积作用 铀矿 铀源 内蒙古 

分 类 号：P619.14[天文地球—矿床学] P512.2[天文地球—地质学]