| 李昂,李元昊,刘怡君,刘卫红,张龙,翟文彬,赵文暄.鄂尔多斯盆地西北部中侏罗统—下白垩统沉积特征及地质意义[J].矿产勘查,2025,16(7):1576-1588 |
| 鄂尔多斯盆地西北部中侏罗统—下白垩统沉积特征及地质意义 |
| Sedimentary characteristics and geological significance of the Middle Jurassic-Lower Cretaceous in the northwestern Ordos Basin |
| 投稿时间：2024-04-16 |
| DOI：10.20008/j.kckc.202507002 |
| 中文关键词: 沉积相 直罗组 宜君—洛河组 砂岩型铀矿 鄂尔多斯盆地西北部 |
| 英文关键词: sedimentary phase the Zhiluo Formation the Yijun-Luohe Formation sandstone-type uranium deposit the northwestern Ordos Basin |
| 基金项目:本文受中国石油天然气股份有限公司科学研究与技术开发项目“含油气盆地铀矿勘查评价与高效开采技术研究”(2021DJ5303)资助。 |
|
| 摘要点击次数: 301 |
| 全文下载次数: 218 |
| 中文摘要: |
| 鄂尔多斯盆地东北部直罗组已发现东胜等多个大型砂岩型铀矿床，已成为中国最大的砂岩型铀矿的矿集区之一，该盆地西北部与东北部成矿条件类似，但中侏罗统—下白垩统砂体类型及分布规律不明，不利于砂岩型铀矿的预测及潜力评价等工作。针对上述问题，本文开展研究区岩心、典型露头剖面实地观测，结合测井、地震资料，对研究区砂体分布进行了综合分析判别，明确了沉积相、沉积微相、砂体类型及展布特征。结果显示，中—上侏罗统包括直罗组和安定组，发育辫状河-曲流河沉积，直罗组砂体发育，安定组砂体相对不发育。下白垩统宜君—洛河组发育沙漠相-辫状河沉积，华池—环河组为河流沉积特征，罗汉洞组为风成沉积特征。结果表明，砂岩型铀矿的形成与砂体，尤其是辫状河砂体的分布联系紧密，研究成果可为研究区下一步的砂岩型铀矿勘探工作提供指导。 |
| 英文摘要: |
| Several large sandstone-type uranium deposits such as Dongsheng have been found in the ZhiluoFormation in the northeastern part of the Ordos Basin, which has become one of the largest concentrations ofsandstone-type uranium deposits in China. The metallogenic conditions in the northwestern part of the Ordos Basinand the northeastern part of the Ordos Basin are similar, but the types of the Middle Jurassic-Lower Cretaceoussand bodies and their distribution pattern are unknown, which is unfavorable for the prediction of sandstone-typeuranium mines and the evaluation of their potentials. In response to the above problems, field observations of coresand typical outcrops in the study area, combined with logging and seismic data, were carried out to comprehensivelyanalyze and discriminate the distribution of sand bodies in the study area, and to clarify the sedimentary phases,sedimentary micro-phases, types of sand bodies and the spreading characteristics. The result shows that the Middle-Upper Jurassic includes the Zhiluo Formation and the Anding Formation, which were deposited by thebraided river-meandering river, the sand body of the Zhiluo Formation is developed, and the sand body of the And-ing Formation is relatively undeveloped. The Lower Cretaceous Yijun-Luohe Formation develops desert phase-braided river deposition, the Huachi-Huanhe Formation is characterized by the river deposition, and the Luohan-dong Formation is characterized by the wind-formed deposition. The result shows that the formation of sandstone-type uranium ore is closely connected with the distribution of sand bodies, especially the braided river sand body,and the research result provides guidance for the next exploration of sandstone-type uranium ore in the study area. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |