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美国原子能委员会制定了一种定量解释的方法,用以确定钻井中岩层内具有γ放射性的元素的含量。该方法以下列关系式为依据:式中:放射性元素的平均重量含量;T——放射层的厚度;k——比例常数;I——钻井轴线上离某固定点的z距离上的γ场强度。此关系式已为理论和实验所证实。在实际工作中,把γ测井曲线所包的面积乘以比例常数,即得钻井内矿化带的品位-厚度积。用矿化带的厚度去除品位-厚度积,就求出了该排的平均品位。对于钻井中的非标准状态要进行修正,使所得的资料与标准状态一致。因为测井方法的取样范围要明显地大于岩心样品的体积,故它的结果比岩心化学分析的数据更有代表性。
The Atomic Energy Commission developed a quantitative interpretation method to determine the amount of γ-radioactive elements in the formation during drilling. The method is based on the following relationship: Where: Average weight content of radioactive elements; T - Thickness of radioactive layer; k - Proportional constant; I - γ field on the axis of the well from a fixed point strength. This relationship has been confirmed both theoretically and experimentally. In practice, multiplying the area covered by the γ logging curve by the constant of proportionality yields the grade-thickness product of the mineralized zone within the borehole. Using the thickness of the mineralized zone to remove the grade-thickness product, the average grade of the row is found. For drilling non-standard state to be amended so that the resulting data consistent with the standard state. Because logging ranges are significantly larger than those of core samples, the results are more representative of the data from the core chemistry analysis.