铀矿勘查中MT数据提取极化信息可行性研究  

Feasibility of Extracting Polarization Information From MT Data in Uranium Exploration

作　　者：王恒 胡英才[1] 张濡亮[1] WANG Heng;HU Yingcai;ZHANG Ruliang(Beijing Research Institute of Uranium Geology,Beijing100029,China)

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《铀矿地质》2021年第2期269-275,共7页Uranium Geology

基　　金：中核集团龙灿工程(二期)科研项目“二连基地砂岩型铀矿物化探三维探测技术研究”(编号:物LCER02)资助;国家自然科学基金(编号:41604126)联合资助。

摘　　要：铀矿勘查中大地电磁测深法(以下简称MT法)的应用十分广泛,而频率域电磁勘探中激电效应切实存在。激电参数作为反映岩、矿石电化学性质的参数,在地质解译过程中常常被认为是金属硫化物的局部富集。为了充分利用铀矿床MT数据辅助地质解译,需要从中提取具有多属性特征的激电参数,能否成功提取该参数一直以来备受关注。文章从激电异常识别和二维反演试算两方面来论述成功提取的可行性。结果表明,仪器能够采集到含矿岩体所产生的激电异常,反演试算结果能够还原理论模型的地下空间展布情况。从而论证了从铀矿床MT数据中提取极化率是可行的。The magnetotelluric sounding method(MT)is widely used in uranium exploration.Due to the existence of induced polarization effect in the frequency domain of electromagnetic exploration,the induced polarization parameter can be used to reflect the electrochemical properties of rocks and ores as the local enrichment of metal sulfides.To make full use of the MT data of uranium deposits in geological interpretation,it is necessary to extract IP parameters with multi-attribute characteristics.In this paper,the feasibility of extracting IP was discussed from two aspects:IP anomaly recognition and two-dimensional inversion trial calculation.The results showed that the instrument can collect the IP anomalies generated by the ore-bearing rocks,and test calculation results of the inversion can restore the underground space distribution of the theoretical model.Therefore,the feasibility of extract the polarizability from MT data was confirmed for the uranium deposits.

关 键 词：大地电磁 铀矿床 激电效应 二维反演 

分 类 号：P631.325[天文地球—地质矿产勘探]