Abstract
The ability of porous media to transmit fluids is commonly referred to as permeability. The concept of permeability is central for hydrocarbon recovery from petroleum reservoirs and for studies of groundwater flow in aquifers. Spatially resolved measurements of permeability are of great significance for fluid dynamics studies. A convenient concept of local Darcy’s law is suggested for parallel flow systems. The product of porosity and mean velocity images in the plane across the average flow direction is directly proportional to permeability. Single Point Ramped Imaging with T 1 Enhancement (SPRITE) permits reliable quantification of local fluid content and flow in porous media. It is particularly advantageous for reservoir rocks characterized by fast magnetic relaxation of a saturating fluid. Velocity encoding using the Cotts pulsed field gradient scheme improves the accuracy of measured flow parameters. The method is illustrated through measurements of 2D permeability maps in a capillary bundle, glass bead packs and composite sandstone samples.
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Acknowledgments
The UNB MRI Centre is supported by an NSERC Major Resources Support Award. BJB thanks NSERC for Discovery and CRD grants. Petroleum Research Atlantic Canada is thanked for financial support as is the Canada Chairs program for a Research Chair in MRI of Materials.
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Romanenko, K.V., Balcom, B.J. Permeability mapping in porous media by magnetization prepared centric-scan SPRITE. Exp Fluids 50, 301–312 (2011). https://doi.org/10.1007/s00348-010-0923-z
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DOI: https://doi.org/10.1007/s00348-010-0923-z