宝龙山铀矿床镭氡平衡系数计算及讨论  

Calculation and Discussion of Radium Radon Equilibrium Coefficient in Baolongshan Uranium Deposit

作　　者：黄笑 王殿学 郭强[2] 宁君[1] 周文博[1] 黄少华[2] 张亮亮[1] 苏晓波[1] HUANG Xiao;WANG Dianxue;GUO Qiang;NING Jun;ZHOU Wenbo;HUANG Shaohua;ZHANG Liangliang;SU Xiaobo(Geological Party No.243,CNNC,Chifeng,Inner Mongolia 024000,China;CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000 [2]核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《铀矿地质》2022年第4期662-670,共9页Uranium Geology

基　　金：松辽盆地项目(编号:地HSL1403);中国核工业地质局项目“松辽盆地通辽-大庆地区铀矿资源调查评价与勘查”(编号:202212);“砂岩型铀矿地球物理测井分层综合解释研究”(202110-9);“内蒙古通辽市大林地区铀矿普查”(编号:201910-1);“砂岩型铀矿资源量估算技术方法对比与推广应用”(编号:202212-21)联合资助。

摘　　要：地浸砂岩型铀矿含矿含水层具有孔隙度大、连通性好、砂岩疏松等特点,在钻探施工过程中,由于孔内井液压力大于层间水静压力,井液沁入围岩和含矿层导致“压氡效应”的产生,打破了原有的镭氡平衡,造成γ测井解释结果偏低,致使铀资源量估算不准确。目前镭氡平衡系数一般采用分析对比法和物探参数孔观测法来确定,引入幂函数对物探参数孔实测数据进行拟合,求取宝龙山铀矿床姚家组下段镭氡平衡系数,并对各方法求得的镭氡平衡系数进行对比分析。结果表明,分析对比法计算得出的镭氡平衡系数可信度最低,物探参数孔观测平均值法计算结果更为准确,而采用幂函数拟合后求取的镭氡平衡系数能有效地避免偶然误差,结果可信度最高,为砂岩型铀矿床镭氡平衡系数的确定提供方法参考。The ore-bearing aquifer of sandstone-type uranium deposit is characterized by large porosity,good connectivity and loose sandstone,etc.In the process of drilling,because the well fluid pressure in the hole is greater than the hydrostatic pressure between layers,the well fluid penetrates into surrounding rock and ore-bearing layer,resulting in"radon pressure effect",which breaks the original radium-radon balance,resulting in low interpretation results ofγlogging,and inaccurate estimation of uranium resources.At present,the balance coefficient of radiumradon is generally determined by the method of analysis and comparison and the method of geophysical parameter hole observation.The power function was introduced to fit the measured data of geophysical parameter hole,and the radium-radon balance coefficient of the lower Yaojia Formation of Baolongshan uranium deposit,and the comparative analysis of the radium-radon balance coefficient obtained by each method.The Calculated results showed that comparative analysis of radium-radon is low in credibility,hole geophysical parameters observed average method can got more accurate result,If the power function fitting is used in calculation,the accidental error can effectively avoid in equilibrium coefficient and the results is with the highest credibility,therefore it can be used as a reference in the determination of radium-radon equilibrium coefficient.

关 键 词：砂岩型铀矿 镭氡平衡系数 物探参数孔 曲线拟合 

分 类 号：P631.6[天文地球—地质矿产勘探]