柴达木盆地东部德令哈凹陷新近系沉积特征及沉积相模式  

The sedimentary characteristics and facies model of the Neogene in the Delingha depression,eastern Qaidam basin

作　　者：钟灵 贺锋 赵兴齐[1,2,3] 李西得 蔡煜琦[1,2,3] 田明明 王杰[1,2,3] ZHONG Ling;HE Feng;ZHAO Xingqi;LI Xide;CAI Yuqi;TIAN Mingming;WANG Jie(National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing,Beijing 100029,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China;CNNC key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing 100029,China)

机构地区：[1]铀资源探采与核遥感全国重点实验室,北京100029 [2]核工业北京地质研究院,北京100029 [3]中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《世界核地质科学》2025年第1期13-28,共16页World Nuclear Geoscience

基　　金：柴达木盆地砂岩型铀矿资源高效预测技术及应用研究(编号:地H2301-1);柴达木盆地中部断隆带铀成矿环境调查与远景评价(编号:202419-5)。

摘　　要：柴达木盆地东部德令哈凹陷是砂岩型铀矿勘探的潜在领域之一,以新近系狮子沟组和上油砂山组为主要研究对象,深入研究沉积相特征与演化,对于铀矿勘探具有一定的指导意义。通过野外露头、钻井岩心、测井分析对岩相组合和沉积建造开展详细观察,识别出区内主要发育冲积扇-辫状河三角洲-湖泊沉积相类型,其中辫状河三角洲平原分支河道和辫状河三角洲前缘水下分流河道沉积具有一定规模和较好的连通性,为铀矿富集提供有利沉积环境。新的认识有助于了解柴东地区狮子沟组和上油砂山组砂体的时空展布,为下一步找矿勘探提供重要依据。Delingha depression in the eastern Qaidam basin is believed a potential area for sandstone type uranium deposit in the target stata of the Neogene Shizigou formation and the Shangyoushashan formation.The in-depth investigation on the sedimentary facies characteristics and evolution of strata will provide valuable guidance for uranium exploration.Detailed observations of lithofacies assemblages and sedimentary formation in field outcrops,drilling cores,and well logging analyses have identified that the alluvial fanbraided river delta-lake are the dominant sedimentary facies type in the study area.Among these,the distributary channels in the braided river delta plain and subaqueous distributary channels in the braided river delta front are well-developed with significant scale and good connectivity,providing a favorable sedimentary environment for uranium enrichment.This new understanding has contributed to the knowledge of the spatial and temporal distribution of sand bodies in the Shizigou formation and the Shangyoushashan formations in the eastern Qaidam basin,and provided key information in guiding the future prospecting and exploration.

关 键 词：柴达木盆地 沉积相 沉积特征 新近系 砂岩型铀矿 

分 类 号：P619.14[天文地球—矿床学]