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已观察到,通过充气钻孔的γ能谱测井,估算铀时存在着大量可变误差。扣除实测能谱的特征钾、铀和钍组分之后,剩下的残余能谱与代表钻孔中~(222)Rn子体的模拟能谱很接近。这些“氡”能谱和代表岩石中铀子体的模拟能谱之间的差异可用作测井受氡迁移影响的标志。
It has been observed that there are a number of variable errors in estimating uranium by gamma-ray logging of gas-filled boreholes. After deducing the characteristic potassium, uranium and thorium components of the measured energy spectrum, the residual energy spectrum remains close to the simulated energy spectrum of ~ (222) Rn in the borehole. The difference between these “radon” spectra and the simulated energy spectrum representing uranium in the rock can be used as a marker for well logging affected by radon migration.