核磁共振测井移谱差谱法影响因素实验分析

On Effect of NMR Differential and Shifted Spectrum Method in Laboratory

针对实际生产中利用核磁共振的移谱、差谱法识别油气所遇到的疑难问题,选取了29块岩心样品和12种不同粘度的原油样品,进行了室内核磁共振特性的测试和分析。根据实验数据,分析了不同粘度的原油在相同测试条件下的T2谱,不同粘度的原油饱和到不同孔隙的岩样中的T2谱,不同岩样饱和盐水后的移谱、差谱,不同岩样饱和不同粘度原油后的移谱、差谱;通过分析发现移谱、差谱法在识别储层油气水的应用过程中的一些影响因素,寻求解决方法,以指导实际生产。

To directly solve the problems we have met in application of NMR differential and shifted spectrum method, 29 core samples and 12 kinds of different viscous raw oil samples are selected to measure their NMR properties in laboratory. According to the laboratory data , T2 spectra have been analysed under different experimental conditions, including various viscous oil , different core samples saturated with water and various viscous oil though changing wait time and echo spacing. Try to find the effect factors of the differential and shifted spectrum method in logging evaluation and search for approaches to direct the interpretation in site.