松辽盆地北部大庆长垣上白垩统四方台组精细地层划分及其铀成矿意义  

FINE STRATIGRAPHIC DIVISION OF THE UPPER CRETACEOUS SIFANGTAI FORMATION IN THE DAQING PLACANTICLINE, NORTHERN SONGLIAO BASIN AND ITS SIGNIFICANCE FOR URANIUM MINERALIZATION

作　　者：刘阳 王军礼 李建国 汤超 钟延秋[4] 谷社峰[4] 魏佳林 杨帅 LIU Yang;WANG Jun-li;LI Jian-guo;TANG Chao;ZHONG Yan-qiu;GU She-feng;WEI Jia-lin;YANG Shuai(Shaanxi Nuclear Industry Geology Surveying Institute,Xi'an 710100;Sino Shaanxi Nuclear Industry Group Geological Survey Co.,Ltd,Xi'an 710100;Tianjin Center,China Geological Survey,Tianjin 300170;Daqing Oil Field Co.,Ltd,Institute of Exploration and Development,Daqing 163712)

机构地区：[1]中陕核工业集团公司,陕西西安710100 [2]中陕核工业集团地质调查院有限公司,陕西西安710100 [3]中国地质调查局天津地质调查中心,天津300170 [4]大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《地层学杂志》2020年第2期181-190,共10页Journal of Stratigraphy

基　　金：国家重点基础发展计划(2015CB45300);中国地质调查局项目“718工程”(DD20170128);中陕核工业集团公司科技攻关项目(61180104)共同资助。

摘　　要：近年来在松辽盆地北部大庆长垣及周边上白垩统四方台组中发现了砂岩型铀矿体,对四方台组的进一步细分及横向对比提出了新的要求,但目前这方面的研究明显不足。本文通过地层岩电组合模式、层序地层特征等方法对松辽盆地北部大庆长垣的四方台组进行了系统的研究,结果表明:四方台组由下至上可细分为三部分,发育两个完整的三级层序(SQ1和SQ2)。四方台组下部岩性为厚层状红色、灰色、灰绿色砂岩、含砾砂岩,为SQ1的LST;四方台组中部岩性为红色、灰绿色泥岩、粉砂质泥岩,为SQ1的EST和HST;四方台组上部岩性为厚层状灰色、灰绿色砂岩与泥岩互层,发育完整的SQ2。砂岩型铀矿化对层位有明显的选择性,主要赋存于四方台组下部低位体系域三角洲沉积体系的分流河道中。这一研究成果为松辽盆地北部四方台组砂岩型铀矿成矿预测提供了理论支撑,也为四方台组地层学研究提供了重要依据。In recent years,sandstone-type uranium deposits have been found in the Upper Cretaceous Sifangtai Formation in the Daqing Placanticline of the northern Songliao Basin.And there is a pressing need for further subdivision and correlation of the Sifangtai Formation,which has been insufficiently studied.In this paper,a comprehensive study of this formation based on an analysis of rock-electricity features combined with a sequence stratigraphic study shows that the Sifangtai Formation in the Daqing Placanticline can be divided into three parts with two complete sequences(SQ1 and SQ2)developed.The lower part(part 1)consists of red,gray,grayish-green thick-bedded sandstone,and gravelly sandstone,and is considered to be the LST of SQ1.The middle part(part 2)is composed of red,grayish-green mudstone and silty mudstone,belonging to the EST and HST of SQ1.The upper part(part 3)consists of gray and grayish-green thick-bedded sandstone interbedded with mudstone,representing the complete SQ2.Sandstone-type uranium mineralization has obvious selectivity for deposits and mainly occurs in the distributary channel of the delta sedimentary system in the lowstand system tract of the lower Sifangtai Formation.The results provide support for the theoretical prediction of sandstone-type uranium mineralization of the Sifangtai Formation in the northern Songliao Basin,and also for the further stratigraphic study of the Sifangtai Formation.

关 键 词：松辽盆地北部 上白垩统 四方台组 精细地层划分 砂岩型铀矿化 

分 类 号：P534.53[天文地球—古生物学与地层学]