地气测量在相山隐伏铀矿勘探中的试验研究  

Experimental Study on Geogas Measurement in Concealed Uranium Exploration

作　　者：吴泽民 罗齐彬 吴信民[2] 王帅帅 符志军 肖昆 谢尚平 WU Ze-min;LUO Qi-bin;WU Xin-min;WANG Shuai-shuai;FU Zhi-jun;XIAO Kun;XIE Shang-ping(School of Geophysics and Measurement-Control Technology, East China University of Technology, Nanchang 330013 ,China;National Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 , China)

机构地区：[1]东华理工大学地球物理与测控技术学院,江西南昌330013 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013

出　　处：《东华理工大学学报（自然科学版）》2019年第2期148-155,共8页Journal of East China University of Technology(Natural Science)

基　　金：国家重点研发计划项目(2017YFC0602600);国家自然科学基金项目(41774134)

摘　　要：为了更好地在华南硬岩地区隐伏铀矿勘探中应用地气测量方法,将地气测量方法在江西相山已知铀矿区进行试验。采用自行研制的恒流式地气采集器在野外已知剖面上进行地气采集,分别使用高密度海绵(固体捕集介质)和硝酸溶液(液体捕集介质)两种捕集介质进行对比测量研究,同时结合地面伽马能谱测量以及土壤天然热释光测量,对比已知钻孔资料,对剖面进行综合异常解释。研究结果表明,地气测量能够在地表反映出埋深约为900 m的铀矿体矿致异常,在三处已知见矿区域上方均呈现出较高水平的铀含量;对比两种不同捕集介质的采集效果,结果表明液体捕集介质的效果较好;采得的地气中铀含量在断裂带上高值明显,说明断裂构造为地气物质从深部向地表迁移提供了一个重要通道;土壤热释光测量与地气测量结果吻合度较高。试验结果说明地气测量能够反映深部的含矿信息,在深部隐伏铀矿勘查中有着良好的应用前景。In order to further apply geogas measurement method in exploration of concealed uranium deposits in hard rock areas of South China,the geogas measurement method is tested in a known uranium mine in Xiangshan,Jiangxi Province. The self-developed constant-flow geogas collector is used to collect the gas from the known profile in the field,two kinds of capture medium are used for comparative measurement studies,high density sponge( solid capture medium) and nitric acid solution( liquid capture medium). At the same time,combined with ground gamma ray spectrum measurement and soil natural thermoluminescence measurement,the measurement results are compared with known drilling data to make a comprehensive anomaly interpretation of the profile. The results show that the geogas measurement can reflect the abnormality of the uranium ore body with a depth of about 900 m on the surface,and there is a higher level of uranium content above the three known mines. Comparing the collection effects of two different capture medium,the effect of nitric acid capture medium is better. The measured uranium content in the fracture structure shows a noticeably high value,indicating that the fracture structure provides an important channel for the migration of geogas from the deep to the surface. Soil thermoluminescence measurement has a good agreement with geogas measurement results. The test results show that the geogas measurement can reflect the deep ore-bearing information and has a good application prospect in the exploration of deep concealed uranium deposits.

关 键 词：地气测量 隐伏铀矿勘查 捕集介质 土壤天然热释光 相山 

分 类 号：P632[天文地球—地质矿产勘探] P619.14[天文地球—地质学]