煤田自然伽马测井曲线在砂岩型铀矿勘查工作中的应用

Application of Natural Gamma Logging of Coal Field in Sandstone Type Uranium Exploration

随着“煤铀兼探”找矿思路的开展,以往煤田钻孔测井资料的应用已成为砂岩型铀矿勘查工作初始阶段的重点研究对象,尤其是自然伽马测井曲线的应用与研究。以平庄盆地黑水地区的煤田钻孔资料为基础,利用岩石放射性元素含量与自然伽马放射强度的相关性,重点筛选自然伽马异常钻孔,圈定铀异常区,选择自然伽马值较大、异常较厚的煤田钻孔进行初步铀矿钻探验证。结果表明:自然伽马异常值与放射性定量伽马异常值呈正相关性,自然伽马强度与铀含量呈正比关系,自然伽马测井曲线与岩心的放射性物探编录曲线具有较好的一致性。煤田钻孔自然伽马测井数据能够为砂岩型铀矿的勘查工作中的铀异常区的圈定和勘查工作部署提供重要指示作用。

With the development of the idea of"coal and uranium exploration",the application of borehole logging data has become the key research object in the initial stage of sandstone uranium explora⁃tion,especially the application and research of natural gamma logging curve.Based on the coal drilling data in the Heishui area of Pingzhuang Basin,the correlation between the radioactive element content of rocks and the natural gamma radiation intensity is used to select the abnormal natural gamma drilling holes,delim⁃it the uranium abnormal areas,and select the coal drilling holes with large natural gamma value and thick anomaly for preliminary uranium drilling verification,which indicates that the natural gamma logging data of coal drilling can delineate the uranium anomaly area in the exploration of sandstone type uranium deposits.The results show that the abnormal value of natural gamma is positively correlated with the abnormal value of radioactive quantitative gamma,and the intensity of natural gamma is proportional to the content of uranium.The natural gamma logging curve has a good consistency with the radioactive geophysical recording curve of the core.The natural gamma logging data of coal field drilling can be used to define the uranium abnormal ar⁃ea in the exploration of sandstone-type uranium ore and provided an important indication in deployment of exploration work.