Permeability mapping in porous media by magnetization prepared centric-scan SPRITE |
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Authors: | Konstantin V Romanenko Bruce J Balcom |
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Institution: | (1) MRI Centre, Department of Physics, University of New Brunswick, P.O. Box 4400, Fredericton, E3B 5A3, Canada; |
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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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