塔里木盆地沙雅隆起区航放异常特征及其找矿意义探究

Study on the Characteristics of Airborne Radioactive Anomalies and Its Prospecting Significance in Shaya Uplift of Tarim Basin

文章对塔里木盆地北部沙雅隆起区航空伽马能谱测量发现的17个航放异常进行了铀矿找矿意义探究,在系统总结航放异常区一带地质、物探等资料的基础上,利用航空磁法测量、航空伽马能谱测量、地面放射性测量、遥感调查等结果对航放异常特征及铀成矿环境进行了分析,大致查明沙雅隆起区密集分布的航放异常与油气层之上含铀含水层密切相关。地面伽马能谱测量铀含量一般在(20~1100)×10^(-6),最高可达6911×10^(-6),表明异常区域均有较好的含铀含水层,且分布范围广、铀含量高;该地段具备较好的砂岩型铀成矿环境,最具潜力的层位为上新统库车含水岩组或中新统吉迪克含水岩组。研究成果为该区快速实现铀矿找矿突破提供了线索,指出下一步工作方向。

Based on the analysis of 17 airborne radioactive anomalies found by airborne gamma-ray spectrometry survey in Shaya uplift of Tarim Basin,the uranium prospecting significance was studied.According to the systematic summary of geological and geophysical data,the result of aeromagnetic survey,airborne gamma-ray spectrometry survey,ground radioactivity survey and remote sensing survey of the anomalies area,the characteristics of aeroradioactivity anomalies and uranium metallogenic environment were analyzed,and it was concluded that the dense distribution of airborne radioactivity anomalies is closely related to the uranium-bearing aquifer above the oil and gas reservoir.The ground gamma-ray spectrometry survey showed that the uranium content is generally(20~1100)×10^(-6),up to 6911×10^(-6),and there are uraniumbearing aquifers in the anomaly area,which are widely distributed and high in uranium content.It is beneficial to sandstone-type uranium mineralization,and the most potential strata are Kuche Formation of Pliocene and Jidike Formation of Miocene.The study result is helpful to the further uranium exploration in this area.