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Quantitative longitudinal fluid saturation profiles with a slice-selected CPMG sequence
G K Pierens1, M Peyron, A J Lucas
1Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge School of Clinical Medicine, UK.
Magnetic Resonance Imaging
|January 1, 1994
Summary
A new nuclear magnetic resonance (NMR) technique enables quantitative profiling of rock core saturation and porosity, even for samples exceeding coil length. This method provides reliable localized relaxation data for diverse rock types.
Area of Science:
- Geophysics
- Petrophysics
- Nuclear Magnetic Resonance (NMR) Spectroscopy
Background:
- Characterizing rock core properties like saturation and porosity is crucial for reservoir analysis.
- Traditional NMR methods are limited by coil length, hindering analysis of longer rock core samples.
Purpose of the Study:
- To develop and validate a novel NMR technique for quantitative longitudinal saturation and porosity profiling of rock cores longer than the NMR coil.
- To assess the reliability of localized relaxation data obtained from various rock core samples.
Main Methods:
- Development of a slice-selected NMR experiment utilizing a prefocused pulse and magnetic field gradient for precise localization.
- Employing a Carr-Purcell-Meiboom-Gill (CPMG) sequence for efficient data acquisition.
- Analysis of diverse rock core samples, including limestones and shaly sandstones.
Main Results:
- Successful implementation of the developed NMR technique for quantitative profiling of long rock cores.
- Acquisition of reliable localized relaxation data, confirmed by comparison with bulk experiments.
- Demonstrated applicability across a range of lithologies, from limestones to shaly sandstones.
Conclusions:
- The developed NMR technique effectively overcomes the limitation of coil length for rock core analysis.
- The method provides accurate and reliable localized saturation and porosity data.
- This advancement offers a valuable tool for detailed petrophysical characterization of geological formations.
