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由于磷块岩在沉积过程中主要吸附有铀。因此利用回归分析方法计算××磷矿小坝矿段放射性测井中磷块岩及其围岩中P_2O_5的含量,从而达到在钻孔中原位测定品位的效果。 小坝矿段位于高坪背斜东翼。岩层倾角较陡(40°～65°)。矿体呈层状赋存于震旦系上统陡山沱组第四段(Zb~(1-4))中。层位稳定,厚度较大(11～29M),顶底板为白云岩、硅质岩及含磷硅质团块等。(见图1)。
Phosphorite is mainly adsorbed by uranium during its deposition. Therefore, the regression analysis method is used to calculate the P_2O_5 content of phosphate rock and its surrounding rock in the radioactivity log of the ×× phosphorite small dam section so as to achieve the effect of in-situ determination of grade in the borehole. Small dam section is located in the east wing of Gaoping anticline. Rock dip angle is steep (40 ° ~ 65 °). The orebodies are layered in the fourth section of the Upper Sinian Doushantuo Formation (Zb ~ (1-4)). Stratum is stable, thick (11 ~ 29M), the top and bottom of dolomite, silicalite and phosphorus-containing siliceous lumps. (see picture 1).