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根据γ测井数据计算铀矿带品位-厚度乘积时,假设钻孔垂直于矿带平面。如若这种假设不正确,那么确定的品位-厚度乘积给出的铀矿线性储量要比实际的多。一个简单的几何处理说明,对于0到20°的相对倾角来说(钻孔的垂线和矿带平面之间的夹角),这个误差是很小的,约6％或更小些;但对于较大的相对倾角来说这个误差可能相当大,例如60°的相对倾角,误差为100％。如果这个相对倾角能根据倾角测井记录来测定或根据地质情况来估计,那么简单的线性修正系数就可应用于视矿石品位-厚度值中来补偿因倾斜层造成的误差。
When calculating the uranium zone grade-thickness product from the gamma log data, it is assumed that the borehole is perpendicular to the plane of the ore zone. If this assumption is not correct, then the determined grade-thickness product gives more linear reserves of uranium than it actually does. A simple geometric treatment shows that this error is small, about 6% or less, for a relative dip of 0 to 20 ° (the angle between the perforation of the borehole and the plane of the ore zone); however This error can be quite large for larger relative angles of inclination, for example a relative inclination of 60 ° with an error of 100%. If this relative angle of dip can be measured from dip logs or estimated based on geological conditions, a simple linear correction factor can be applied to the grade of ore - thickness to compensate for errors due to slanted layers.