title: A rapid measurement of flow propagators in porous rocks.
abstract: 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.
authors.affiliation: Department of Chemical Engineering, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Mitchell
authors.forename: A J
authors.initials: AJ
authors.lastname: Sederman
authors.forename: E J
authors.initials: EJ
authors.lastname: Fordham
authors.forename: M L
authors.initials: ML
authors.lastname: Johns
authors.forename: L F
authors.initials: LF
authors.lastname: Gladden
mesh_terms: D000465:Algorithms; D004058:Diffusion; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D016062:Porosity; D012212:Rheology / Q000379:methods*; D012492:Salts / Q000737:chemistry*; D012987:Soil
chemical_list: D012492:Salts; D012987:Soil; C017082:brine