松辽盆地北部四方台组工业铀矿体的发现及其意义  

Discovery and significance of industrial uranium ore in Sifangtai Formation, north Songliao basin

作　　者：汤超 金若时[1,2] 谷社峰 李建国[1,2] 钟延秋[3] 苗培森 司马献章[1,2] 魏佳林[1,2] TANG Chao;JIN Ruo-shi;GU She-feng;LI Jian-guo;ZHONG Yan-qiu;MIAO Pei-sen;SIMA Xian-zhang;WEI Jia-lin(Tianjin Centre,CGS,Tianjin 300170;Laboratory of Non-fossile Energy Minerals,Tianjin Centre,CGS,Tianjin 300170;Exploration and Development Research Institute of Daqing Oilfield Co Ltd.,Daqing Heilongjiang 163712)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]中国地质调查局天津地质调查中心非化石能源矿产实验室,天津300170 [3]大庆油田有限责任公司勘探开发研究院,大庆163712

出　　处：《地质调查与研究》2018年第1期1-8,32,共9页Geological Survey and Research

基　　金：国家重点基础发展计划(973计划)"中国北方巨型砂岩型铀矿陆相沉积环境与大规模铀成矿作用(2015CB45300)";中国地质调查局项目"油气田勘查区砂岩型铀矿调查与勘查示范(DD20160128)";国家青年自然科学基金"云蒙山变质核杂岩周边同构造岩脉的变形特征及年代学分析(41502195)"

摘　　要：通过松辽盆地北部钻井放射性异常排查,发现了数千口钻井存在自然伽玛异常,圈定了18处铀矿找矿靶区,对油田钻井进行原位钻探验证,在四方台组发现了工业铀矿体。区内工业铀矿体位于四方台组底部砂岩层,呈板状、透镜状;矿石类型以中细砂岩为主,铀矿物有沥青铀矿和铀石;铀矿化受控于曲流河三角洲沉积体系,剖面上位于河道底部;铀矿体规模与砂体密切相关,砂体规模越大,铀矿化层越多,矿体规模越大。松辽盆地北部四方台组工业铀矿体的发现,突破了区内四方台组地层及盆地内部没有铀矿的现状,实现了新区新层位的重要找矿发现,扩大了松辽盆地砂岩型铀矿找矿空间,同时取得了思路和方法的突破,将为其它含油气盆地开展油田资料筛查进行铀矿战略选区和找矿提供依据和方法借鉴,对松辽盆地乃至我国北方中新生代盆地由盆缘向盆地中间、由浅部向深部开展砂岩型铀矿找矿具有重要的意义。Through the investigation of radioactive anomalies in North Songliao basin,it is found that there are natural gamma anomalies in thousands of wells,and 18 uranium ore prospecting targets are delineated.The industrial uranium ore bodies were found by the drilling verification in Sifangtai Formation.The industrial uranium ore bodies which is plate-like and lenticular in the area are located in the sandstone at the bottom of the Sifangtai Formation.The ore type is dominated by fine sandstone,and the uranium minerals are bituminous uranium and uranium.Uranium mineralization is controlled by the meandering river delta sedimentary system,which is located at the bottom of the river in a profile.The size of the uranium ore body is closely related to the sand bodies,especially the larger size of the sand bodies,and the more the uranium mineralization layer the larger the ore bodies scale.The discovery of the industrial uranium ore bodies in the Sifangtai Formation in north Songliao basin has broken through the present situation of the Sifangtai Formation and the center of the basin without uranium ore.The important prospecting of the new strata is realized in the new area,which expanded the sandstone type uranium ore prospecting space.At the same time,it made a breakthrough in ideas and methods which could provide the basis and methods for other oil and gas basins to carry out oil field data screening,uranium ore strategic constituency and prospecting.It is of great significance for the Mesozoic and Cenozoic basins in Songliao basin and even in the north of China to develop sandstone-type uranium deposits from the shallow to the deep.

关 键 词：松辽盆地 砂岩型铀矿 四方台组 自然伽马异常 油气勘探资料 

分 类 号：P619.14[天文地球—矿床学]