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000005798 084__ $$2WoS$$aEnvironmental Sciences
000005798 084__ $$2WoS$$aLimnology
000005798 084__ $$2WoS$$aWater Resources
000005798 1001_ $$0P:(DE-Juel1)129542$$aStingaciu, L.-R.$$b0$$uFZJ
000005798 245__ $$aCharacterization of unsaturated porous media by high-field and low-field NMR relaxometry
000005798 260__ $$aWashington, DC$$bAGU$$c2009
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000005798 440_0 $$05958$$aWater Resources Research$$v45$$x0043-1397
000005798 500__ $$aMany thanks to Y. Q. Song (Schlumberger-Doll Research, Connecticut) for giving us access to his software for inverse Laplace transform. The DFG (projects PO 746/2-1 and Transregional Collaborative Research Centre 32) has to be acknowledged for financial support and Norbert Klitzsch and Oliver Mohnke (Applied Geophysics, RWTH Aachen University) for providing access to the low field setup. Finally, the reviewers are acknowledged for their very useful comments that helped greatly with the improvement of our paper.
000005798 520__ $$aA comparison study of nuclear magnetic resonance relaxometry at high and low magnetic field (7 and 0.1 T) has been initiated for investigating the influence of the magnetic field strength, variable clay content, and different degrees of saturation on the relaxometric properties of four ideal porous media. The samples consisted of medium sand with increasing fractions of kaolin clay ranging from 0 to 15%. Six different volumetric water contents between saturation and theta = 0.05 were used. Changes in water content of the samples were achieved by slow evaporation. T-2 relaxation curves were monitored by the Carr-Purcell-Meiboom-Gill sequence and were further analyzed by inverse Laplace transformation, yielding T-2 distribution functions. Sand shows a slight continuous shift with decreasing water content of a bimodal distribution function of T-2 to faster relaxation at high and low magnetic field. Sand-clay mixtures show broad, bimodal distribution functions for both magnetic field intensities which shift slightly with decreasing water content. Signal amplitude behavior with variation of saturation degree was also monitored. An expected proportionality of the total signal amplitude with water content was observed for all samples at 0.1 T, whereas at 7 T deviations occurred for samples with a clay content higher than 5%, which are assigned to loss of signal in the first echo periods. The relaxivity in unsaturated clay-based porous media is mostly surface dominated, as the weak and comparable dependence of 1/T-2 on T-E at both field strengths shows. Nevertheless, for a reliable determination of water content in mixed systems with varying texture and saturation the employment of multiecho sequences at low magnetic field strength are preferable.
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000005798 7001_ $$0P:(DE-Juel1)VDB1270$$aPohlmeier, A.$$b1$$uFZJ
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000005798 7001_ $$0P:(DE-Juel1)VDB17057$$aWeihermüller, L.$$b3$$uFZJ
000005798 7001_ $$0P:(DE-Juel1)129425$$avan Dusschoten, D.$$b4$$uFZJ
000005798 7001_ $$0P:(DE-HGF)0$$aStapf, S.$$b5
000005798 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b6$$uFZJ
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000005798 8567_ $$uhttp://dx.doi.org/10.1029/2008WR007459
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