铀矿地质2025，Vol.41Issue(5)：919-927,9.DOI:10.3969/j.issn.1000-0658.2025.41.064
松辽盆地大林铀矿床镭氡平衡系数计算及其特征
Calculation and Characteristics of Radium-Radon Equilibrium Coefficient of Dalin Uranium Deposit in Songliao Basin
摘要
Abstract
Gamma logging is a critical prospecting method in uranium geological exploration.The migration of radium and radon in uranium-bearing strata significantly impacts the quantitative interpretation of gamma logging and the reserve estimation of uranium deposits.The radon suppression phenomenon can disrupt the radium-radon equilibrium,leading to reduced quantitative interpretation outcome from gamma logging,thereby adversely affecting the accuracy of uranium deposit reserve calculations.Dalin uranium deposit in Songliao basin is divided into four mineralized horizons.This study selected two geophysical parameter boreholes as the research subjects to calculate the radium-radon equilibrium coefficient with three methods.We conducted calculations and studies on the main layers(ore Layer Ⅰ and ore Layer Ⅱ)of the Dalin uranium deposit,compared and analyzed the results.The results indicate that the two boreholes exhibited rapid radon recovery during the initial phase,both approached radium-radon equilibrium within 30 to 40 days.This observation indicates that the Dalin uranium deposit possesses favorable formation permeability and high water saturation.Furthermore,ore Layer Ⅱ reached the equilibrium state of radium-radon earlier than ore Layer Ⅰ,indicating better formation permeability and higher radon exhalation rate in ore Layer Ⅱ.In calculating the radium-radon equilibrium coefficient,the geophysical parameter borehole observation method demonstrates higher accuracy and reliability than the comparative method based on gamma logging interpretation and sampling analysis.Specifically,the non-linear fitting method better reflects the entire process from the disruption to the restoration of the radium-radon equilibrium,effectively minimizing errors caused by fluctuations in the observations.关键词
镭氡平衡系数/物探参数孔/大林铀矿床/非线性拟合法/放射性衰变规律Key words
radium-radon equilibrium coefficient/geophysical parameter borehole/Dalin uranium deposit/the non-linear fitting method/laws of radioactive decay分类
天文与地球科学引用本文复制引用
尹龙银,王殿学,宁君,黄笑,张亮亮,余弘龙,何明勇,张政..松辽盆地大林铀矿床镭氡平衡系数计算及其特征[J].铀矿地质,2025,41(5):919-927,9.基金项目
中国核工业地质局铀矿地质项目"松辽盆地通辽-大庆地区铀矿资源调查评价与勘查"(编号:202212)和"中国北方砂岩型铀矿铀镭平衡特征研究"(编号:202512-6)联合资助. （编号:202212）
