TMD-L测井监测喇嘛甸油田气顶方法研究

Methods of Monitoring Gas Cap with TMD-L Logs in Lamadian Oilfield

大庆喇嘛甸油田气顶监测中应用常规的中子-中子测井识别气液界面技术具有放射性风险,研究使用脉冲中子源的热中子多门衰减岩性(TMD-L)测井识别气层方法。通过反向叠合TMD-L测井的近远探测器非弹计数率RIN曲线与近远探测器俘获计数率比RTMD曲线,以及叠合近探测器俘获计数率NTMD曲线和远探测器俘获计数率FTMD曲线,能有效识别气层。统计分析表明,喇嘛甸油田气顶油藏的气层定量解释标准为气层指示曲线GI>3.2和中子孔隙度曲线PHIT<0.15。应用实例表明TMD-L测井资料能够安全、有效地监测气液界面。

The conventional neutron-neutron logging for identifying gas-liquid interface in monitoring the gas cap of Daqing Lamadian oilfield has the radioactive risk. Gas-layer identification method by using thermal multigate decay-lithology(TMD-L)logging derived from pulsed neutron source is studied.With reverse overlapping RIN and RTMD curves of TMD-L log,overlapping NTMD and FTMD curves can be used to effectively identify gas layers.Statistical analysis shows that the quantitative interpretation standards for gas layers in the Lamadian gas-cap reservoir are GI>3.2and PHIT<0.15.The application example shows that the TMD-L logging data can safely and effectively monitor the gas-liquid interface.