Sequence Stratigraphy of the Lower Cretaceous Uraniferous Measures and Mineralization of the Sandstone-hosted Tamusu Large Uranium Deposit, North China     

LIU Bo  SHI Zhiqiang  PENG Yunbiao  ZHANG Pengfei  LI Peng 《《地质学报》英文版》2022,96(1):167-192

The Bayingobi basin is the Mesozoic-Cenozoic basin in North China in which the Tamusu uranium deposit is located.The ore-target layer of the deposit is the Lower Cretaceous Bayingobi Formation,which developed as a fan deltashallow lacustrine deposit.The distributary channel sand body of the fan delta plain and the underwater distributary channel sand body of the fan delta front formed a favorable uranium reservoir,so the study of sequence stratigraphy is extremely important to understanding the genesis of uranium deposits.On the basis of field investigation and a large number of borehole logs,the high resolution sequence stratigraphy of the Lower Cretaceous is divided and the system tracts of different periods are established.The relationship between deposition,interlayer oxidation and uranium enrichment is discussed.The Lower Cretaceous Bayingobi Formation can be divided into two fourth-order sequences(Sq1 and Sq2).The lower member of the Bayingobi Formation is referred to as Sq1,which is composed of a falling-stage system tract(FSST)on top.On the other hand,the upper member of the Bayingobi Formation is referred to as Sq2,which is composed of a lowstand system tract(LST),transgressive system tract(TST)and highstand system tract(HST).The lowstand system tract forms a favorable stratigraphic structure(mud-sand-mud formation)with the lacustrine mudstone of the overlying transgressive system tract,that is conducive for the migration of uranium-bearing oxygen water.The organic matter and pyrite in the fan delta sand body,as well as the dark mudstone in the distributary bay,provided a reducing medium for uranium mineralization.The ore body mainly occurs in the distributary channel,underwater distributary channel or the mouth bar of the fan delta.As a result of the moderate thickness,high permeability,favorable barrier and rich reducing medium,the rich ore body mainly occurs in the underwater distributary channel and mouth bar sand body of the delta front.Based on study of the sequence stratigraphy,the model of the sequence,sedimentation and mineralization of the uranium deposit is established,which enriches uranium metallogenic theory and provides a reference for exploration of the same type of uranium deposits.  相似文献   

涠西南凹陷涠洲10-3油田及围区流三段沉积相研究   总被引：3，自引：0，他引：3  

李茂  董桂玉  漆智 《沉积学报》2015,33(2):314-325

为了促进涠西南凹陷涠洲10-3油田及围区流三段油藏的滚动勘探开发,开展了油区沉积相精细研究。利用岩芯、录井、测井和地震等资料,在识别不同级别层序界面和湖泛面的基础上,将涠洲10-3油田及围区流三段划分为2个长期基准面旋回和8个中期基准面旋回,建立了高分辨率层序地层对比格架。在岩芯描述基础上,进行单井沉积相、连井沉积相、平面沉积相分析,认为研究区流三段发育冲积扇、扇三角洲和湖泊3种沉积相,并系统划分了沉积微相类型。探讨了碎屑流沉积的相带归属,将发育在河道中的碎屑流沉积划分为河道型碎屑流沉积,将单独产出的碎屑流沉积根据沉积环境不同划分为水上非河道化碎屑流沉积和水下非河道化碎屑流沉积。最后对各中期基准面旋回的沉积相展布特征和演化规律进行了探讨,并建立了符合研究区的沉积相模式。  相似文献   

准噶尔盆地车排子凸起春光区块沙湾组沉积特征新认识   总被引：1，自引：0，他引：1  

叶茂松  解习农  李祥权  吴蕾  杨晓培  张辉松 《沉积学报》2015,33(5):951-964

准噶尔盆地车排子凸起沙湾组沉积环境存在较大争议,主流观点认为辫状河三角洲或者滩坝砂沉积。通过对研究区内钻井、古生物、地球物理资料分析认为,车排子凸起沙湾组并非水下环境,而是处于陆上暴露环境,发育冲积扇和河流沉积体系,其中研究区北部发育冲积扇体系,而中南部则发育河流体系,且不同沉积时期沉积体系类型发生变化:沙一段发育冲积扇-辫状河沉积,沙二段发育冲积扇-曲流河沉积,沙三段则缺少典型的河流沉积,以冲积扇体系及洪泛平原沉积为主。总体而言,春光区块沙湾组沉积期具有多物源、多沉积体系发育的特征,垂向上构成了两类冲积扇-河流体系沉积模式。  相似文献   

内蒙古元宝山小建昌营子地区三面井组沉积环境     

陈井胜  邢德和  刘淼  张德军  马国祥  杨佳林  张志斌 《世界地质》2015,34(4):1013-1023

在进行内蒙古1∶5万区域地质调查工作中,对内蒙古赤峰元宝山镇小建昌营子一带的下二叠统三面井组砂岩进行了粒度分析。结果表明,萨胡成因环境判别值为10.66~10.76,沉积环境为河流相或三角洲相;弗里德曼粒度参数判别为陆相河砂沉积;浊流C-M判别图解显示沉积环境介于三角洲与浊流沉积之间。三面井组总体为一套河流相-三角洲前缘滑塌浊积扇沉积。滑塌浊积扇一般发育于深湖、半深湖区,结合本地区三面井组地层中缺乏海相碳酸盐岩沉积,综合认为本区的三面井组形成于河流-湖泊三角洲环境。  相似文献   

新构造运动对冲积河流影响研究的回顾与展望   总被引：1，自引：0，他引：1  

金德生  乔云峰  杨丽虎  宋献方 《地理研究》2015,34(3)

研究新构造运动本身及其对冲积河流的影响,可以深化地貌学理论、沉积旋回复杂性假设等的认识,也与实际应用密切相关。将活动构造作为新构造运动的一个组成部分,回顾了新构造运动对冲积河流影响,并提及新构造运动本身的研究进展。控制流域水系格局及河流走向的研究,侧重地质学解释;新构造运动应力场的研究,深化了新构造运动机理及驱动力的探讨。三类基本缓慢新构造运动影响水系发育、河床演变、河型变化及河道冲淤,表现出复杂性、层次性、敏感性和先兆性;文章兼及河流侵蚀作用形成"新构造"的研究进展,回顾了物理模型实验研究成就及数学模拟研究端倪。进而指出:应注重该学科的交叉、渗透、综合研究与新构造快速运动方式对冲积河流影响的研究,定期进行新构造运动活跃区的升降速率、河床演变与泥沙输移的观测,进一步推进物理模型实验与数学模拟研究,并加强研究力量的协作与融合。  相似文献   

辽宁陆东凹陷前河油田水下扇沉积粒度特征及水流强度分析          下载免费PDF全文

雷霄雨 《沉积与特提斯地质》2015,35(3):63-67

前河油田九佛堂组为一套水下扇沉积。通过对不同层位取心井粒度资料分析及对比,分析其差异的原因,确定各层位搬运方式及沉积作用形式,并运用霍姆斯水流强度图分析从湖盆边缘向湖盆内的水流强度变化。根据岩性组合及测井曲线特征,识别出扇根、扇中前缘及扇端3种微相。并认为沿水流及砂体发育方向为部署有利区带。  相似文献   

Groundwater recharge through an alluvial fan in the Atacama Desert,northern Chile: mechanisms,magnitudes and causes     

John Houston 《水文研究》2002,16(15):3019-3035

The Chacarilla fan in the Atacama Desert is one of several formed in the Late Miocene at the foot of the Pre‐Andean Cordillera overlying the large, complex, Pampa Tamarugal aquifer contained in the continental clastic sediments of the fore‐arc basin. The Pampa Tamarugal aquifer is a strategic source of water for northern Chile but there is continuing doubt over the resource magnitude and recharge. During January 2000 a 1 in 4 year storm in the Andes delivered a 34 million m³ flash flood to the fan apex where c. 70% percolated to the underlying aquifers. Groundwater recharge through the fan is calculated to be a minimum of 200 l/s or 6% of the long‐term catchment rainfall. These figures are supported by hydrochemical data that suggest that recharge may be 9% of long‐term rainfall. Isotopic data suggest groundwater less than 50 years old is transmitted westward through the permeable sheetflood sediments of the fan overlying the main aquifer. Analysis of this and other events shows that the hydrological system is non‐linear with positive feedback. The magnitude of groundwater recharge is dependent on climatic variations, antecedent soil moisture storage and changes in channel characteristics. Long‐term declines in groundwater level may partly result from climatic fluctuations and the causes of such fluctuations are discussed. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

BOOK REVIEWS     

《The Professional geographer》1986,38(3):295-316

Book Reviewed in this article: Marine Resources of Kuwait: Their Role in the Development of Non-oil Resources . Fatimah H. Y. al -Abdul -Razzak Recollections of a Revolution: Geography as Spatial Science . Mark Billinge , Derek Gregory and Ron Martin Entre l'Eden et l'Utopie . Luc Bureau Developments in Political Geography . M. A. Busteed The Elements of Graphing Data . William S. Cleveland Rural Resource Management . Paul J. Cloke and Chris C. Park Third World Atlas . Ben Crow and Alan Thomas Exploitation, Conservation, Preservation: A Geographic Perspective on Natural Resource Use . Susan L. Cutter , Hilary Lambert Renwick, and William H. Renwick . Wine Regions of the Southern Hemisphere . Harm Jan de Blij Regional Development: Problems and Policies in Eastern and Western Europe . George Demko The Geographer at Work . Peter R. Gould Change in the Amazon Basin . John Hemming Geography Since the Second World War . R. J. Johnston and P. Claval Urbanization in China: Town and Countryside in a Developing Economy 1949–2000 A.D. , R. J. R. Kirkby Transport and Communications for Pacific Microstates: Issues in Organisation and Management . Christopher C. Kissling Fluvial Forms and Processes . David Knighton The Urban Millennium . Josef W. Konvitz Technological Transition in Cartography . Mark Stephen Monmonier Field Guide to Soils and the Environment: Applications of Soil Surveys . Gerald W. Olson Northern Australia: The Arenas of Life and Ecosystems on Half a Continent . Don Parkes A Killing Rain: The Global Threat of Acid Rain . Thomas Pawlick From the Family Farm to Agribusiness: The Irrigation Crusade in California and the West, 1850–1931 . Donald J. Pisani Hybrid Maize Diffusion in Kenya . Franz -Michael Rundquist Warning and Response to the Mount St. Helens Eruption . Thomas F. Saarinen and James L. Sell Coastal Geomorphology in Australia . B. G. Thom Tropical Rain Forests of the Far East , 2nd ed . T. C. Whitmore The Dark Side of the Earth . Robert Muir Wood Categorical Data Analysis for Geographers and Environmental Scientists , Neil Wrigley  相似文献   

太行山前平原非河道条件下地下调蓄功能实验研究--以滹沱河冲洪积平原为例   总被引：5，自引：0，他引：5  

张光辉费宇红  邢开刘克岩  王金哲申建梅 聂振龙 《水文》2004,24(2):15-19

摘要：通过实验研究探讨了太行山前平原地下调蓄能力,实验研究表明,在汇水坑渗、井灌和引水渠渗条件下,太行山前冲洪积平原地下调蓄功能不仅与地表积水深度、入渗时间有关,而且还与汇水总量的多少有关。单位时间渗漏量的大小与地表蓄水深度呈正相关关系。地表蓄水深度愈大,单位时间渗漏量愈大;累计渗漏量随着入渗时间的延长而增加,渗漏速率随着累计渗漏量的增加而减小。采用井灌方式进行地下调蓄的关键,是选择具有强渗透性的层位。  相似文献   

浊积扇体系沉积微相对物性及成岩控制的定量研究——以鄂尔多斯盆地ZH40区块为例   总被引：1，自引：0，他引：1  

王瑞飞  宋子齐 《地层学杂志》2009,33(1)

以鄂尔多斯盆地ZH40区块水下浊积扇沉积体系为例,根据储层物性、铸体薄片鉴定、扫描电镜和X-衍射分析等资料,定量研究水下浊积扇沉积体系沉积微相对物性和成岩的控制作用。分析表明:从水下扇的扇根到扇中,再到扇缘,矿物成分成熟度呈先增加后降低的趋势,扇中微相的长石砂岩最为发育,成分成熟度和结构成熟度最好;在水下扇浊积体系中,扇中微相砂体的溶蚀作用和次生孔隙最为发育;扇根、扇中和扇缘微相砂体机械压实作用引起的孔隙度损失程度接近,而扇根和扇缘微相砂体的胶结作用强烈。储集层成岩作用研究和孔隙度预测中,必须考虑沉积微相的控制作用。  相似文献