摘要
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。
Pulsed neutron decay spectrum (PND-S) logging can simultaneously measure the gamma ray of inelastic scattering and capture gamma ray. A single pass can provide 144 curves directly, including capture cross section sigma curve, formation ratio curve, far near sonde counting rate curve, total inelastic scattering gamma ray interpreted by software, and neutron, density porosity curve, which are most sensitive to the gas formation. Meanwhile, it can be operated in casing (even in tubing) because of its small diameter. The application and analysis of 8 wells in Shengli petroliferous province show that it can identify the shaly sand gas formation through casing independently quickly and visually with high interpretation coincidence, which provide reliable technology for seeking gas in cased hole.
出处
《油气地质与采收率》
CAS
CSCD
2003年第2期70-72,共3页
Petroleum Geology and Recovery Efficiency
