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Book Chapter

Quantitative magnetic resonance imaging methods for core analysis

By
Quan Chen
Quan Chen
MRI Centre, Department of Physics, University of New Brunswick, P.O. Box 4400, Fredericton, NB E3B 5A3, Canada (e-mail: bjb@unb.ca)
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Frank R. Rack
Frank R. Rack
Joint Oceanographic Institutions, 1201 New York Avenue, NW, Suite 400, Washington, DC 20005, USA
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Bruce J. Balcom
Bruce J. Balcom
MRI Centre, Department of Physics, University of New Brunswick, P.O. Box 4400, Fredericton, NB E3B 5A3, Canada (e-mail: bjb@unb.ca)
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Published:
January 01, 2006

Abstract

The majority of sedimentary rocks have significant paramagnetic impurities, which lead to magnetic resonance signal lifetimes too short to be detected by clinical magnetic resonance imaging (MRI) methods. Quantitative information is the ultimate goal for rock-core analysis. The SPRITE (single-point ramped imaging with T1 enhancement) imaging technique has proven to be a very robust and flexible method for the study of a wide range of systems with short signal lifetimes. As a pure phase-encoding technique, SPRITE is largely immune to image distortions generated by susceptibility variations, chemical shift and paramagnetic impurities, unlike clinical magnetic resonance imaging methods. It enables systems with transverse lifetimes as short as tens of microseconds to be successfully visualized. Our experimental results show that most sedimentary rocks have a single exponential transverse magnetization decay for T*2, which suggests that quantitative imaging of local fluid content can be easily obtained. Some examples of MRI techniques are represented that reveal internal sedimentary characteristics and heterogeneity. In addition, the application of quantitative MRI techniques to examine flow mechanisms in rock cores is outlined.

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Contents

Geological Society, London, Special Publications

New Techniques in Sediment Core Analysis

R. G. Rothwell
R. G. Rothwell
National Oceanography Centre, UK
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Geological Society of London
Volume
267
ISBN electronic:
9781862395152
Publication date:
January 01, 2006

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