阿其图乌拉地区下白垩统赛汉组层序地层与铀成矿远景预测  

Sequence stratigraphy and metallogenetic prospecting prediction of uranium in Saihan Formation,Aqituwula area

作　　者：刘波[1,2] 杨建新 谷峰 张锋 LIU Bo YANG Jianxin GU Feng ZHANG Feng(School of Earth Sciences ,Jilin University, Changchun i30000,Jilin ,China Geolgical Brigade No. 208,Burea of Nuclear Industry ,Baotou 014010, Inner Mongolia ,China)

机构地区：[1]吉林大学地球科学学院,吉林长春130000 [2]核工业二〇八大队,内蒙古包头014010

出　　处：《矿产与地质》2017年第3期437-444,共8页Mineral Resources and Geology

基　　金：中国核工业地质局项目:内蒙古二连盆中东部铀矿资源调查评价与勘查项目(编号:201612)资助

摘　　要：阿其图乌拉凹陷位于苏尼特隆起内,凹陷周缘铀源条件较好,通过实地工作及前人资料整理,研究该地区沉积相、沉积构造和测井相等特征,建立测井相、测井相标志。研究认为该地区下白垩统赛汉组发育浅水辫状河三角洲-滨浅湖沉积体系。层序地层分析可精细研究不同时期沉积充填序列,并可进行等时地层对比。通过标准层序地层分析,将赛汉组共分为4个体系域类型,分别为湖侵体系域、高位体系域、下降期体系域及低位体系域,其中高位体系域及下降期体系域具有铀储层好、岩石还原容量高的特点。矿化异常主要产于高位及下降期体系域内。通过各体系域"层序-氧化带-岩相古地理"编图,提出"层序地层-储层-氧化带预测技术",并圈定Ⅰ、Ⅱ号成矿远景区,并认为Ⅱ号成矿远景区辫状河前缘砂体具有铀储集性能好、还原容量高的特点,可先开展钻探验证工作。Aqituwula depression is located in Sunite uplift and has good uranium source conditions in its surounding area.Based on actrural survey and previous data processing,the analysis of sedimentary facies,sedimentary structures and logging characteristics,the log facies and their marks have been established.The research results show that a shallow braided River Delta-shallow lake sedimentary system is developed in Saihan Formation of the area.Sequence stratigraphic analysis can be used to fine study on sedimentary filling sequence in different periods,and can be used to isochronic stratigraphic comparison.Through the standard sequence stratigraphic analysis,the Saihan Formation can be divided into 4system tracts respectively：lacustrine transgressive system tract,highstand system tract,falling stage systems tract and lowstand system tract.Among them,the highstand system tract and the falling stage system are characteristics by good uranium storage and high rock reduction capacity.The mineralization anomalies are mainly produced in the highstand and falling stage system tract.According to maping to the system of the＂sequence-lithofacies,oxidation zone and paleogeography＂,the authors propose a prediction technique of＂sequence stratigraphy-reservoir and oxidation zone＂and delineate metallogenetic-prospecting areasⅠandⅡ.It is considered that the braided river front sand body which located in No.2metallogenic prospect area is characteristics by good uranium reservoir property and reducing capacity and is suitable to carry out drilling verification work at first.

关 键 词：层序地层 铀储层 层序-氧化带-岩相古地理 成矿远景区 阿其图乌拉地区 

分 类 号：TE121.3[石油与天然气工程—油气勘探] P619.14[天文地球—矿床学]