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脉冲中子衰减%D能谱测井可同时测量非弹性散射伽马射线和俘获伽马射线。它一次下井可直接获得 14 4条曲线 ,其中的地层俘获截面曲线、地层比值曲线和远、近探头计数率曲线以及经过解释软件处理后的总非弹性散射伽马射线和中子、密度孔隙度曲线对气层反映最敏感。同时 ,该测井仪直径小 ,可过套管 (甚至油管 )测量。通过胜利油区八口井的应用 ,表明该技术可过套管独立识别泥质砂岩气层 ,且其方法快速、直观 ,解释符合率高 ,为在套管井中找气提供了可靠的技术方法。
The pulsed neutron attenuation% D spectral log can measure both inelasticly scattered gamma rays and captured gamma rays. It can directly obtain 14 4 curves when going down well. Among them, the stratigraphic trapping section curves, formation ratio curves and far and near probe count rate curves, as well as the total inelastic scattering gamma rays and neutrons after the interpretation software processing, the density porosity The curve is most sensitive to the gas layer. At the same time, the logging tool is small in diameter and can measure over casing (or even tubing). Through the application of eight wells in Shengli Oilfield, it shows that this technology can independently identify the argillaceous sandstone gas through casing, and the method is fast and intuitive, which can explain the high coincidence rate and provide a reliable technical method for finding gas in cased hole .