Rapid T1–T2 Measurement Using Drive Equilibrium Pulse Sequence

Аннотация

In the last decade, multidimensional Laplace nuclear magnetic resonance (NMR) was widely used in laboratory and oil industry. Compared to one-dimensional NMR, multidimensional NMR measurements have advantages in fluid recognition and content calculation, etc. However, the applications are limited due to its long measurement time. The paper presents a rapid T₁–T₂ measurement pulse sequence—drive equilibrium (DE) pulse sequence which can obtain fluid T₁–T₂ distribution down to two one-dimensional measurements and the obtained correlation maps are in good consistency with the results by traditional T₁ encoding pulse sequence. It is found that the performance of DE pulse sequence is related to measurement times. If we add measurement times, DE pulse sequence will work better. The sequence can be used in time limit experiments, like downhole fluid analysis and online reaction monitoring.