周晓林,代迪,苟熠,刘志臣,张应文
ZHOU Xiaolin,DAI Di,GOU Yi,LIU Zhichen,ZHANG Yingwen

• 1:贵州省地矿局102地质大队

摘要(Abstract)：

黔北地区二叠系上统由两个半海陆交互沉积旋回组成,是煤系铀矿形成的有利地带。应用黔北地区上二叠统煤田测井资料综合分析,发现了煤系底部含黄铁矿黏土岩自然伽马异常。通过相关的岩样测试分析资料,这自然伽马异常主要是由放射性元素铀引起的。利用自然伽马场与含铀量的相关性,即γ<3.79 PA/kg(铀质量分数小于0.010 111%)划分为正常值,3.79 PA/kg≤γ<10.29PA/kg(铀质量分数在0.010 111%~0.030 027%)划分为煤系铀矿(潜在)矿化异常值,γ≥10.29PA/kg(铀质量分数大于0.030 027%)划分为煤系铀矿(潜在)异常值,解释了煤田测井自然伽马场异常,圈定了本区晚二叠世煤系铀矿(潜在)矿化异常区、(潜在)异常区找矿靶区。靶区围绕官店向斜、松坎向斜、坟坝向斜分布,成矿区(带)均位于二叠统龙潭组煤系底部含黄铁矿黏土岩层中,受龙潭组和茅口组地层控制。综合评价表明,找矿靶区异常连续性较好,根据相关性推算铀的平均质量分数为0.018 558%,达边界品位以上,具有较好的煤系铀矿找矿潜力。
The Late Permian of northern Guizhou is composed of two and a half paralic sedimentary cycles. It is a favorable area for the formation of coal and uranium deposits. Through comprehensive analysis of logging data of Upper Triassic Permian coalfield in northem Guizhou Province, the natural gamma anomaly of pyrite and clay rock in bottom of coal measures was found. Test and analysis of the data through related rock samples, show that the natural gamma anomaly was mainly caused by radioactive element uranium. using correlation between natural gamma field and uranium content, it is indicated that the natural gamma range less than 3.79 PA·kg-1(the mass fraction of uranium is less than 0.010 111%) was classified as normal values, the natural gamma race greater than or equal to 3.79 PA·kg-1 and less than 10.29 PA·kg-1(the uranium mass fraction in 0.010 111%~0.030 027%) as coal uranium mineralization anomalies(potential)value. The natural gamma race greater than or equal to 10.29 PA·kg-1(uranium mass fraction is higher than 0.030 027%) is classified as coal uranium(potential)abnormal value.The anomaly of natural gamma in the field of coal logging was explained, the areas of the Late Permian coal and uranium mineralization anomalies(potential) and prospecting target area in(potential) anomaly areas were delineated. The target area distributed around Guandian syncline, Songkan syncline and grave dam syncline, Metallogenic belt is located in pyrite clay of the bottom of coal stratum in the Longtan Formation of Late Permian, controlled by Longtan Formation and Maokou Formation. Comprehensive evaluation showed that the abnormal continuity of prospecting target area is better. According to the correlation related calculation, the average uranium content was 0.018 558%, surpassed the boundary grade, has a better potential for prospecting uranium deposits in coal measures.

关键词(KeyWords)： 测井资料;自然伽马异常;煤系铀矿;岩样测试;找矿靶区
well logging data;natural gamma anomaly;associated uranium deposits in coal measures;sample test;ore prospecting target area

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质调查项目(资[2014]01-030-027)~~

作者(Author): 周晓林,代迪,苟熠,刘志臣,张应文
ZHOU Xiaolin,DAI Di,GOU Yi,LIU Zhichen,ZHANG Yingwen

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