A rapid measurement of flow propagators in porous rocks.
NMR flow propagators have been obtained for brine flowing through Bentheimer sandstone using the rapid DiffTrain pulse sequence. In this way, 8 flow propagators at different observation times Delta were acquired in 67 mins, compared to 7 h for the same measurements implemented with conventional pulsed field gradient (PFG) sequences. DiffTrain allows this time saving to be achieved through the acquisition of multiple displacement probability distributions over a range of Delta in a single measurement. If only the propagator moments are required, this experiment time can be further reduced to 9 mins through appropriate sparse sampling at low q values. The propagator moments obtained from DiffTrain measurements with dense and sparse q-space sampling are shown to be equivalent to those obtained from conventional PFG measurements.
Mitchell
J
J
Department of Chemical Engineering, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, United Kingdom.
Sederman
A J
AJ
Fordham
E J
EJ
Johns
M L
ML
Gladden
L F
LF
D000465:Algorithms; D004058:Diffusion; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D016062:Porosity; D012212:Rheology / Q000379:methods*; D012492:Salts / Q000737:chemistry*; D012987:Soil
D012492:Salts; D012987:Soil; C017082:brine