Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5407538 | Journal of Magnetic Resonance | 2006 | 11 Pages |
Abstract
Pulsed field gradient NMR flow propagators for water flow in Bentheimer sandstone are measured at low fields (1H resonance 2Â MHz), using both unipolar and bipolar variants of the pulsed gradient method. We compare with propagators measured at high fields (1H resonance 85Â MHz). We show that (i) measured flow propagators appear to be equivalent, in this rock, and (ii) the lower signal to noise ratio at low fields is not a serious limitation. By comparing different pulse sequences, we study the effects of the internal gradients on the propagator measurement at 2Â MHz, which for certain rocks may persist even at low fields.
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Authors
Philip M. Singer, Gabriela Leu, Edmund J. Fordham, Pabitra N. Sen,