黑龙江三江盆地中东部白垩纪以来沉积演化特征及铀矿化有利找矿层位  

Sedimentary evolution characteristics since Cretaceous and favourable horizons of uranium mineralization in middle-east Sanjiang basin,Heilongjiang

作　　者：何中波[1] 冀华丽 曹建辉[1] 杨帆[2] HE Zhongbo;JI Huali;CAO Jianhui;YANG Fan(Beijing Research Institute of Uranium Geology,Beijing 100029,China;SINOPEC Research Institute of Petroleum Engineering,Beijing 100101,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]中石化石油工程技术研究院,北京100101

出　　处：《世界核地质科学》2018年第4期187-202,共16页World Nuclear Geoscience

基　　金：中国地质调查局地质调查项目(编号:DD2016013641);中国核工业地质局铀矿勘查项目(编号:201713)资助

摘　　要：三江盆地位于黑龙江省东北部,是我国东北重要的产煤盆地之一,砂岩型铀矿地质工作程度较低。通过对三江盆地中东部绥滨坳陷和前进坳陷ZKJS1、 ZKY1、 ZKQX1及ZKQX2等9个钻孔岩心和测井资料的精细分析,认为绥滨坳陷主要发育辫状河三角洲和湖泊相,前进坳陷主要发育冲积扇(湿地扇)和湖泊相。绥滨坳陷城子河期主要发育辫状河三角洲沉积,至穆棱期向滨浅湖-半深湖过渡;前进坳陷宝泉岭时期主要发育冲积扇(湿地扇)-河流-湖泊沉积体系,至富锦期主要向河湖相砂泥岩沉积过渡。结合砂岩型铀矿成矿理论,从地层结构及砂体发育特征的角度讨论了三江盆地中东部砂岩型铀矿有利找矿层位,指出下白垩统城子河组和新近系富锦组发育的辫状河三角洲分支河道砂体厚度大、分布稳定、连续性强,渗性好,富含还原介质,发育良好"泥-砂-泥"地层结构,是研究区砂岩型铀矿有利找矿层位。Sanjiang basin is located in eastern Heilongjiang province, which is an important coal production basin in the northeast of China and was poorly studied for sandstone-hosted uranium mineralization. The author studied sedimentary evolution characteristics since Cretaceous and recognized that the basin developed braide river delta facies and lacustrine facies in Suibin depression,humid alluvial fan and lacustrine facies in Qianjin depression according to core and well logging in 9 boreholes for uranium. Sedimentary systems of braide river delta facies are mainly developed in Chengzihe Age and translated to shore-shallow and semideep lake facies in Muling Age of Suibin depression. Sedimentary systems of humid alluvial fan-fluvial facies-lacustrine facies are mainlydeveloped in Baoquanling Age and translate to fluvial and lacustrine facies in Fujin Age of Qianjin depression. According to sandstone-type uranium metallogenic theory, the author discussed the favorable horizons in stratigraphic structure and sandbody development features and pointed out that sandbody in braide river delta are distributed extensively and continueously with porosity and permeability, the sandbody is covered by aquiclude and constitutes " mud-sand-mud" texture in Chengzihe Formation of Lower Cretaceous and Fujin Formation of Neogene, which are favourable for sandstone-hosted uranium mineralization and can be regarded as the significant layer of uranium exploration favourable sedimentary facies belts.

关 键 词：三江盆地 富锦组 城子河组 沉积相 砂岩型铀成矿 

分 类 号：P586[天文地球—岩石学] P619.14[天文地球—地质学]