Fluid Typing: Efficient NMR Well-Logging with Interleaved CPMG Sequence at Different Frequencies

• Published in: Applied magnetic resonance Vol. 48; no. 10; pp. 981 - 987
• Main Authors: Wu, Baosong, Altobelli, Stephen A., Fukushima, Eiichi
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01-10-2017; Springer Nature B.V
• Subjects: Atoms and Molecules in Strong Fields; Electrons; Experiments; Laser Matter Interaction; Magnetic fields; NMR; Nuclear magnetic resonance; Organic Chemistry; Original Paper; Physical Chemistry; Physics; Physics and Astronomy; Solid State Physics; Spectroscopy/Spectrometry; Viscosity; United States > US
• ISSN: 0937-9347; 1613-7507
• DOI: 10.1007/s00723-017-0929-2

Fluid typing in reservoirs is currently based on longitudinal relaxation and/or diffusion contrast method, the latter represented by the dual-TE method which uses two types of Carr–Purcell–Meiboom–Gill (CPMG) echo trains with short and long echo spacings. In this paper, we describe a scheme to enhance efficiency of dual-TE method by combining it with multi-frequency CPMG. We took advantage of the echo spacing in the long-TE pulse sequence and interleaved a second sequence for a different slice in the gaps to obtain information from both slices. Verification experiments were performed with a surface coil in a gradient magnetic field.