砂岩型铀矿铀镭及镭氡平衡系数研究

发布时间：2018-03-20 07:10

本文选题：伽玛测井　切入点：铀镭平衡系数　出处：《东华理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：在铀矿勘查工作中,对于砂岩型铀矿床而言,特别是在矿层地段岩心采取率不高的情况下,放射性伽玛测井结果是铀资源储量计算的主要资料和依据。伽玛测井方法是确定铀矿体的空间位置、品位及厚度的重要技术手段,为了准确计算铀资源量,需要对伽玛测井数据进行参数修正,包括铀镭平衡系数修正、镭氡平衡系数修正、矿石湿度修正、钍钾修正等。由于地浸砂岩型铀矿具有较高的孔隙度和水饱和度,因此该类型的铀矿床都表现出铀-镭及镭-氡不平衡现象。所以,必须找出进行伽玛测井的具体条件下铀镭、镭氡之间的平衡系数值,才能利用伽玛测量的结果求出铀的真实含量和准确地确定含矿层边界。因此,当矿石中的铀镭、镭氡平衡遭到破坏时,计算的铀含量必须作相应的修正。本文对砂岩型铀矿样品化学分析法计算铀镭平衡系数的两种计算方法:铀线、镭线储量加权计算方法进行对比分析,也对工程上获取镭氡平衡系数的两种方法:物探孔参数测量法和矿心分析与伽玛测井解释结果计算的确定方法进行了对比和影响因素分析,研究内容及结论:(1)对铀线、镭线这两种储量加权计算方法进行理论差异分析和准确性探讨,发现利用镭线储量加权计算的铀镭平衡系数要比利用铀线储量加权计算的铀镭平衡系数更大。(2)利用镭线储量加权计算的铀镭平衡系数对伽玛测井数据进行修正所得结果与实际数据相比,更加接近实际结果,误差更小,为了避免夸大矿化厚度,人为的造成铀资源量的虚高,谨慎的方法是利用以用镭线储量加权计算的铀镭平衡系数进行放射性测井数据修正。(3)物探孔参数测量法施工工期和观测周期长,成本高,但受客观因素影响较小,方法比较科学、合理,计算结果准确、可靠;矿心分析与伽玛测井解释结果计算的确定方法成本低,但数据量大,对计算结果的影响因素较多。这两种方法在地浸砂岩型铀矿镭氡平衡系数计算和研究中都非常重要,缺一不可,两种方法之间可以相互验证。
[Abstract]:In uranium exploration work, for sandstone-type uranium deposits, especially in the case of low core adoption rate in ore-bed areas, Radioactive gamma logging results are the main data and basis for the calculation of uranium reserves. Gamma logging method is an important technical means to determine the space location, grade and thickness of uranium ore bodies. It is necessary to revise the parameters of gamma logging data, including uranium radium equilibrium coefficient, radium radon equilibrium coefficient, ore humidity correction, thorium potassium correction, etc. Because of the high porosity and water saturation of in-situ leaching sandstone-type uranium deposit, Therefore, the uranium deposits of this type all show the imbalance phenomena of uranium-radium and radium-radon. Therefore, it is necessary to find out the equilibrium coefficient between uranium-radium and radium-radon under the specific conditions of gamma logging. Only by using the results of gamma measurements can the true content of uranium and the boundary of ore-bearing strata be determined accurately. Therefore, when the uranium radium and radium radon equilibrium in the ore are destroyed, The calculated uranium content must be revised accordingly. This paper makes a comparative analysis of two methods for calculating uranium radium equilibrium coefficient by chemical analysis of sandstone-type uranium deposits: uranium wire and weighted calculation method of radium reserves. Two methods of obtaining radium radon equilibrium coefficient in engineering are also compared and analyzed, including geophysical pore parameter measurement method and determination method of core analysis and gamma log interpretation result calculation. The contents and conclusions of the study are as follows: 1) uranium wire. The theoretical differences and accuracy of the two methods of weighted calculation of radium reserves are analyzed and discussed. It is found that the uranium radium equilibrium coefficient calculated by weighted radium reserves is larger than that of uranium radium equilibrium coefficient calculated by uranium wire reserves weighting.) the gamma logging data are corrected by uranium radium equilibrium coefficients weighted by radium reserves. The results are compared with the actual data, Closer to the actual results, less error, to avoid exaggerating the mineralization thickness, artificially resulting in a false high uranium resources, The prudent method is to use the uranium radium equilibrium coefficient weighted by radium line to correct the radium-radium radioactivity logging data.) the method of geophysical exploration pore parameter measurement has long construction period and observation period and high cost, but it is less affected by objective factors. The method is more scientific, reasonable, accurate and reliable, and the determination method of core analysis and gamma log interpretation results is of low cost and large amount of data. These two methods are very important in the calculation and study of radium radon equilibrium coefficient in in-situ leaching sandstone-type uranium deposit.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P619.14

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