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编者按:在铀矿床,γ测井定量解释工作的任务是根据γ测井曲线,求出矿体厚度及其放射性元素的含量。目前,我国使用的解释方法是基于γ射线通过介质时遵从指数衰减规律的原理。根据数学推导,可得出钻孔轴心线上γ射线强度的分布规律,从而得到进行定量解释的基本公式S=K_(qh)。为此,在γ射线饱和的模型上测得K值,并根据矿体厚度及矿化均匀程度的不同,分别采用1/2I_(最大)、4/5I_(最大)或给定强度等方法,求出矿体边界及其厚度,然后根据异常曲线面积求出矿体中放射性元素的含量。
Editor’s Note: In uranium deposits, the task of quantitative interpretation of gamma logs is to determine the thickness of the ore body and its radioactive element content based on the gamma logging curve. At present, the method of interpretation used in our country is based on the principle that exponential decay rules when γ-rays pass through the medium. According to the mathematical derivation, the distribution law of the γ ray intensity on the axis of borehole can be obtained, and the basic formula S = K_ (qh) for quantitative explanation can be obtained. Therefore, the K value was measured on the model of γ-ray saturation. According to the difference of ore body thickness and mineralization uniformity, the values of 1 / 2I_ (maximum), 4 / 5I_ (maximum) Determine the ore body boundary and its thickness, and then calculate the content of radioactive elements in the ore body according to the area of abnormal curve.