煤田测井资料在圈定黔北煤系铀矿靶区中的应用

发布时间：2018-04-28 11:35

本文选题：测井资料 + 自然伽马异常　；参考：《煤田地质与勘探》2017年06期

【摘要】：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γ3.79 PA/kg(铀质量分数小于0.010 111%)划分为正常值,3.79 PA/kg≤γ10.29PA/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。
[Abstract]:The Permian upper part of the northern Guizhou Province is composed of 2.5 intercontinental sedimentary cycles, which is a favorable zone for the formation of coal system uranium deposits. The natural gamma anomalies in the bottom of the coal measures are discovered by the comprehensive analysis of the logging data of the upper two coal fields in the north of Guizhou Province. It is caused by radioactive element uranium. Using the correlation between natural gamma field and uranium content, that is, gamma 3.79 PA/kg (uranium mass fraction is less than 0.010111%) is divided into normal values, 3.79 PA/kg less 10.29PA/kg (uranium mass fraction in 0.010 111%~0.030 027%) is divided into coal bearing uranium ore (potential) mineralized anomaly value, gamma > 10.29PA/kg (uranium mass fraction is greater than 0.0300) 27%) it is divided into uranium mine (potential) anomaly value, which explains the natural gamma field anomaly in coalfield logging, and delineated the Late Permian coal series uranium ore (potential) mineralized anomaly area and (potential) prospecting target area. The target area around the official store syncline, the ridge syncline, the cemetery syncline distribution, and the metallogenic area (belt) are located at the bottom of the coal measures in the Longtan coal series of the two stack. It is controlled by the Longtan group and maurkou formation in the ore clay strata. The comprehensive evaluation shows that the abnormal continuity of the target area is better. The average mass fraction of uranium is 0.018558% according to the correlation, and it is above the boundary grade. It has a better uranium prospecting potential in coal system.

【作者单位】：贵州省地矿局102地质大队;
【基金】：中国地质调查局地质调查项目(资[2014]01-030-027)~~
【分类号】：P619.14;P631.81

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