摘要
基于反转恢复法建立质子NMR二维时域数据,经双重付里叶变换获得二维频域数据。除了可以一次性实现对核磁系统的自旋-晶格弛豫时间T_1和自旋-自旋弛豫时间T_2测量外,本方法的重要优点体现在对复相系的分析上,即一方面根据诸单相化学位移的差别自然地分辨T_(1j)和T_(2j)(i)=1,2…相标号)的相归属;另一方面第二个维度的引入则大大提高了对复相系统的解析能力。本文详细地讨论了二维频域数据如何获取复相系统中各单相的核磁弛豫参数以及推断各单相组分所占比例等问题,并例示含水原油样品的分析结果。
Proton NMR two dimensional time-domain data are collected based on the inversion-recovery technique.Double Fourier transformation of those data yields the two dimensional frequency-domain data.The procedure allows simultaneous determination of both spin-lattice relaxation time T_1 and spin-spin relaxation time T_2 of the nuclear spin system. For multi-phase systems, the two dimensional frequency-domain analysis shows many advantages. Relaxation components T_(ij), T_(2j)…(j=1,2…index of mono-phase) might be distinguished naturally according to differences in their chemical shifts.On the other hand, the introduction of second dimension improves the analytic capability, especially for multi-phase systems, considerably. In this paper, the determination of those nuclear magnetic relaxation parameters and the relative component of mono-phase from two dimensional frequency-domain data of the multi-phase system are discussed in detail. The analytic results for water containing crude oil samples are given as examples.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1992年第1期72-77,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
