摘要
柴达木盆地西缘地区位于柴西坳陷构造带,断裂构造活动强烈,油气广泛分布,具有较大的铀成矿潜力。为研究砂岩型铀矿找矿目的层地球物理特征与铀成矿关系,先基于地球物理测井响应特征,查明区内砂体发育以及放射性异常范围,分析铀成矿环境;再结合能谱-地质剖面,研究不同地层岩性放射性特征;采用化学分析与伽玛测井,分析铀矿化段岩体中烃类含量与放射性关系。研究表明:区内目的层砂体发育较好,具有铀成矿有利的泥砂互层架构及氧化还原环境,且砂体(粗砂、含砾粗砂)放射性值较高;区内铀矿化受油气还原作用控制,为铀元素富集成矿提供有利还原障。目的层局部见有较高铀异常带(点),为推断铀矿体深部延伸提供重要技术支撑。
The western margin of Qaidam Basin is located in the tectonic belt of the Western Qaidam Depression,with strong faulting activity,wide distribution of oil and gas,and great uranium mineralization potential.In order to study the relationship between the geophysical characteristics of the target layer and uranium mineralization in sandstone type uranium deposit,firstly,based on the geophysical logging response characteristics,the development of sand body and the range of radioactive anomalies in the area were identified,and the uranium mineralization environment was analyzed.Combined with energy spectrum-geological profile,the radiological characteristics of different strata were studied.The relationship between the content of hydrocarbons and radioactivity in uranium mineralized rock mass was analyzed by chemical analysis and gamma logging.Research shows that the sandbodies of the target layer in the area are well developed and have a mud-sand interbedded structure and redox environment with strong uranium mineralization,and the sandbodies(coarse sand and gravel-bearing coarse sand)have high radioactivity.Uranium mineralization in the area is controlled by hydrocarbon reduction,which provides a powerful reduction barrier for uranium enrichment and mineralization.High uranium anomaly zones(spots)are found locally in the target layer,which provides important technical support for inferred deep extension of uranium ore bodies.
作者
时志浩
陈擎
叶雷刚
陈斌
康利刚
邵恒博
王继斌
张未
白强
SHI Zhihao;CHEN Qing;YE Leigang;CHEN Bin;KANG Ligang;SHAO Hengbo;WANG Jibin;ZHANG Wei;BAI Qiang(Nuclear Industry 203 Institute,Xi'an,Shaanxi 710086;Qinghai Nuclear Industry Geological Bureau,Xining,Qinghai 810001)
出处
《地质与勘探》
CAS
CSCD
北大核心
2022年第2期258-273,共16页
Geology and Exploration
基金
中央财政铀矿勘查专业基金项目(编号:201915)
青海省科技厅重点研发与转化计划项目(编号:2018-SF-109)联合资助
关键词
柴达木盆地西缘坳陷
砂岩型铀矿
地球物理特征
油气还原
放射性
western margin depression of Qaidam Basin
sandstone-type uranium
geophysical characteristics
oil and gas reduction
radioactivity
