摘要
传统的碳氧比测井仪不测量地层泥质含量、孔隙度等参数，影响老井饱和度评价精度，为此研制了PNST脉冲中子全谱测井仪。通过合理的传感器结构设计和电路设计，PNST一次下井能同时完成双源距碳氧比、中子寿命、脉冲中子中子、能谱水流4项测井功能，仪器自动化程度高；测井资料能提供岩性、泥质含量、孔隙度、饱和度、层位产水等解释信息，可以不依赖裸眼井测井资料进行套管井剩余油评价。在89个21％～31％孔隙度的砂岩地层将PNST解释结果与取心资料对比，有效孔隙度标准差为1．1％，剩余油饱和度标准差为4．5％。PNST适用于在套管井中寻找油气层、确定储层含油饱和度、监测油藏动态变化。
A new pulsed neutron spectral tool（PNST） has been developed to meet the need of determining remaining oil saturations in cased wells without the assistance of open hole log. As the result of reasonable design of tool structure of the neutron generator, shield and detectors, and electrical circuits, the tool has the ability to carry out dual-spaced carbon/oxygen logging, neutron lifetime logging, pulsed neutron-neutron logging and spectral water flow logging simultaneously at one pass. Through interpreting its log, provided are data of formation lithology, shale volume, porosity, and oil saturation. By comparing interpreted PNST data with corresponding data obtained from sealed core analysis for 89 sand zones with porosity varying from 21% to 31%, the standard deviations of effective porosity and remaining oil saturation are 1.1% and 4. 5%, respectively. The tool is applied to locating hydrocarbon bearing formations, determining remaining oil saturation, and monitoring reservoir performances in cased wells.
出处
《测井技术》
CAS
CSCD
北大核心
2011年第1期83-88,共6页
Well Logging Technology
关键词
脉冲中子全谱测井仪
碳氧比
中子寿命
氧活化
动态监测
pulsed neutron spectral logging tool, carbon/oxygen ratio, neutron lifetime, oxygen activation, dynamic monitoring
