罗宁，陈路路，俞礽安，等. 二连盆地中部脑木根凹陷北次洼地区铀成矿地质条件分析[J].河南理工大学学报(自然科学版), doi: 10.16186/j.cnki.1673-9787.2025040013.

LUO N, CHEN L L, YU R A, et al. Metallogenic geologic condition of Beiciwa Sandstone-hosted Uranium Deposit in Naomugen Depression, Central Erlian Basin [J]. Journal of Henan Polytechnic University (Natural Science), doi: 10.16186/j.cnki.1673-9787.2025040013.

二连盆地中部脑木根凹陷北次洼地区铀成矿地质条件分析(网络首发)

罗宁¹，陈路路^2,3，俞礽安²，李健敏¹，臧永亮¹，余小林¹，刘阳⁴

（1.中国石油华北油田公司，河北 任丘 062552；2.中国地质调查局天津地质调查中心(华北地质科技创新中心)，天津 300170；3.中国地质调查局 铀矿地质重点实验室，天津 300170；4.中陕核工业集团 地质调查院有限公司，陕西 西安 710100）

摘要: 本次利用油田资料的“二次开发”，在二连盆地脑木根凹陷北次洼地区下白垩统赛汉组下部钻获了高品位的厚大工业铀矿体。目的 为了研究北次洼铀矿的矿石矿化特征，分析铀成矿地质条件，探讨关键控矿要素及成矿潜力。方法 开展钻探施工、野外地质调查，以及室内岩矿鉴定、电子探针及元素地球化学等方法综合研究。结果 结果表明：（1）钻探共揭露3层铀矿化体，铀矿体位于悬浮状灰色砂体中，初步揭露了近7 km长的铀矿带规模。（2）大致了解了铀矿石的基本特征，粒度偏粗且胶结疏松，铀矿物与黄铁矿、含钛矿物、黏土矿物等共生，铀矿石中Pb、Zn、Ni、Co、V、Mo、Cd、Re等伴生元素明显富集可能与后期流体成矿作用相关。（3）初步梳理了北次洼地区有利的铀成矿地质条件：铀源供给充足，理想的辫状河道沉积砂体，构造反转及北东向、北西向控矿断裂，有机碳、黄铁矿等还原介质，有利的补-径-排水动力系统以及由潮湿向干旱古转变的气候。结论 结合研究区铀成矿地质条件、氡气异常，梳理了关键控矿要素，为二连盆地脑木根凹陷北次洼地区的铀成矿潜力探讨提供参考。

关键词: 砂岩型铀矿；赛汉组；成矿地质条件；二连盆地；脑木根凹陷

中图分类号：P619.14

doi: 10.16186/j.cnki.1673-9787.2025040013

基金项目: 国家重点研发计划项目（2023YFC2906700）；国家自然科学基金资助项目（92162212）；中国石油华北油田项目（HBYT-EL-2022-JS-180，HBYT-EL-2024-JS-338）；国际地球科学计划项目（IGCP675）；中国地质调查项目（DD20243380）

收稿日期：2025-04-08

修回日期：2025-07-30

网络首发日期：2025-10-16

Metallogenic geologic condition of Beiciwa Sandstone-hosted Uranium Deposit in Naomugen Depression, Central Erlian Basin (Online)

Luo Ning¹, Chen Lulu^2,3, Yu Ren’an², Li Jianmin¹, Zang Yongliang¹, Yu Xiaolin¹, Liu Yang⁴

(1. PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China; 2. Tianjin Center, China Geology Survey, North China Center of Geoscience Innovation, Tianjin 300170, China; 3. Key Laboratory of Uranium Geology, China Geological Survey, Tianjin, 300170; 4. Sino Shanxi Nuclear Industry Group Geological Survey Co., Ltd., Xi’an 710100, Shaanxi, China)

Abstract: With the secondary development of oil field data, the thick and large high-grade industrial uranium ore body was obtained in the lower Cretaceous Saihan Formation in Naomugen depression of Erlian Basin. Objectives In order to study the characteristics of uranium ore, the geological conditions of uranium mineralization, the key ore-controlling factors and ore-forming potential. Methods The comprehensive research methods included the field investigation and drilling verification, indoor analysis of rock and ore identification, electron probe and element geochemistry. Results The results showed that, (1) Three layers of uranium mineralized bodies were revealed. Uranium ore occurred in the suspended gray sand bodies. This work preliminarily revealed the scale of uranium ore belt with nearly 7 km long. (2) The basic characteristics of uranium ore were roughly understood. The granularity of uranium ore was coarse and the rock was loose. Uranium minerals were mainly associated with pyrite, titanium-bearing minerals and clay minerals. The enrichment of associated elements was closely related to the late fluid mineralization, such as Pb, Zn, Ni, Co, V, Mo, Cd, Re, etc. (3) The favorable geological conditions for uranium mineralization in the Beiciwa area were preliminarily sorted out. Uranium sources were well supplied. Sedimentary sand bodies from fan deltas and braided channels provided ideal uranium reservoirs. Regional tectonic inversion and NE-trending and NW-trending faults constrained the uranium mineralization process. Organic carbon and pyrite were the important reduction media. The favorable replenishment-runoff-drainage system and the paleoclimate which changed from humid to arid provided the possibility for uranium mineralization. Conclusions The key ore-controlling factors and uranium metallogenic potential of Naomugen Depression in Erlian Basin were discussed based on metallogenic geological conditions and radon anomaly. The research results can provide reference for discussion on uranium mineralization potential in Naomugen Depression of Erlian Basin.

Key words：sandstone-hosted uranium deposit; Saihan Formation; metallogenic geological conditions; Erlian basin; Naomugen depression

CLC: P619.14