摘要
Abstract
A new pulsed neutron spectral tooI(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 iithology, 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. 50％, respectively. The tool is applied to locating hydrocarbon bearing formations, determining remaining oil saturation, and monitoring reservoir performances in cased wells.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Key words
pulsed neutron spectral logging tool/ carbon/oxygen ratio/ neutron lifetime/ oxygen activation/ dynamic monitoring分类
天文与地球科学
