东胜深部直罗组沉积环境与砂岩型铀矿发育  

Zhiluo Formation Sedimentary Environment and Sandstone-type Uranium Deposit Development in Deep Part Dongsheng Coalfield

作　　者：宋洪柱[1] 左明星[1] 江涛[1] 刘娟[1] Song Hongzhu;Zuo Mingxing;Jiang Tao and Liu Juan(The First Exploration Bureau,CNACG,Handan,Hebei 056004)

机构地区：[1]中国煤炭地质总局第一勘探局

出　　处：《中国煤炭地质》2019年第9期18-24,共7页Coal Geology of China

基　　金：国家能源局“国家大型煤炭基地开发潜力研究”资助项目;中国煤炭工业协会“新时代生态地质勘查模式研究”资助项目

摘　　要：鄂尔多斯盆地北部东胜地区中侏罗统延安组内蕴藏着丰富的砂岩型铀矿,铀矿床的发育与沉积环境有着密切的关系。鉴于东胜深部矿区直罗组也存在砂岩型铀异常显示,主要从沉积学的角度,分析东胜深部矿区直罗组砂岩型铀矿的发育与分布特征。通过对东胜深部矿区直罗组岩心、测井曲线等分析,认为直罗组早中期主要发育辫状河沉积,逐渐向曲流河沉积过渡;通过多种单因素参数综合分析,恢复了直罗组下段(下亚段和上亚段)的沉积相展布;通过测井信息识别了砂岩型铀异常的层位及其大致分布范围。研究发现,东胜深部矿区直罗组砂岩型铀异常主要发育在乌审旗的西南部和杭锦旗附近,直罗组下亚段铀异常主要发育在辫状河心滩和河道砂体的过渡位置,直罗组上亚段铀异常主要发育在河道砂体的外缘。The middle Jurassic Yan’an Formation in the Dongsheng coalfield,northern Ordos Basin has abundant sandstone-type uranium deposits,and their development is closely related to sedimentary environment.In consideration of the Zhiluo Formation in deep part Dongsheng coalfield also has sandstone type uranium indications,thus mainly from sedimentology point of view,analyzed deep part Zhiluo Formation uranium deposit development and distribution features.Through Formation rock core,well logging traces analysis considered the formation’s early and middle stage had developed braided river deposits,gradually transition to meandering river deposits.Through comprehensive multiple single factor parameters analysis has reconstructed sedimentary facies extension of Zhiluo Formation Lower Member(lower and upper submembers).Through well logging information has identified sandstone type uranium anomaly horizons and approximate distribution range.The study has shown that Zhiluo Formation sandstone type uranium anomalies in deep part of Dongsheng coalfield are mainly developed in the southeastern Uxin Banner and Hanggin Banner nearby,uranium anomalies in the formation’s lower submember are mainly developed in transitional position of braided river mid-channel bar and channel sand,upper submember uranium anomalies mainly developed in channel sand exterior margin.

关 键 词：砂岩型铀矿 沉积环境 直罗组 东胜深部 

分 类 号：P612[天文地球—矿床学]