DBPapers
DOI: 10.5593/SGEM2016/HB14/S01.024

SHORT SIGNALS IN NMR LOW-FIELD SPECTROSCOPY OF ROCK CORE SAMPLES

G. Stoch, A.T. Krzyzak
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-80-3 / ISSN 1314-2704, 2 - 5 November, 2016, Book 1 Vol. 4, 181-188pp, DOI: 10.5593/SGEM2016/HB14/S01.024

ABSTRACT

One of the major problems with some NMR measurements of solid-state materials, such as rock cores, is their inherently short spin-spin relaxation time. Short T2, T2* severely restricts the applicability of standard spin- and gradient echo- based techniques. Therefore, simple FID sequence is a helpful choice for such measurements, which in turn is fraught with its own limitations. The FID signal reveals a distortion close to t = 0 that in the frequency domain results in a significantly distorted spectrum. If the phase artifact is also involved, the net problem becomes mutually coupled and cannot be resolved accurately according to its constituents considered in separation. The complete correction procedure should intrinsically deal with both artifacts, due to their mutual dependency. In this work we show how this complex problem can be resolved for signal and spectrum measurements of rock cores on a low-field NMR system. The distortion issue, however, goes beyond that original scope and it is present everywhere the FID sequence is involved.

Keywords: NMR, rock cores, Fourier Transform, missing points, FID.

PAPER DOI: 10.5593/SGEM2016/HB14/S01.024, SHORT SIGNALS IN NMR LOW-FIELD SPECTROSCOPY OF ROCK CORE SAMPLES

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