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Assessing the quantitative reliability of solid-state 13C NMR spectra of kerogens across a gradient of thermal maturity


Smernik, Ronald J; Schwark, Lorenz; Schmidt, Michael W I (2006). Assessing the quantitative reliability of solid-state 13C NMR spectra of kerogens across a gradient of thermal maturity. Solid state nuclear magnetic resonance, 29(4):312-321.

Abstract

Five type II kerogens, shown by elemental analysis and Rock-Eval pyrolysis to represent a gradient of thermal maturity, were further characterized using a range of solid-state ¹³C NMR spectroscopic techniques. ¹³C cross polarization (CP) NMR spectra of the kerogens confirmed the well-established pattern of increasing aromaticity with increasing thermal maturity. Spin counting showed that CP observability was around 50% for the immature kerogens, and only 14–25% for the mature kerogens. Spin counting also showed that the direct polarization (DP) observabilities were >80% for all but one of the kerogens. Despite the large differences in observability between the two techniques, aromaticities derived from corresponding CP and DP spectra differed by only 1–15%. The RESTORE technique showed that the low CP observability of the immature kerogens was due mostly to rapid T₁ᵨH relaxation, whereas both rapid T₁ᵨH relaxation and slow polarization transfer contributed to the low CP observability of the mature kerogens.

Five type II kerogens, shown by elemental analysis and Rock-Eval pyrolysis to represent a gradient of thermal maturity, were further characterized using a range of solid-state ¹³C NMR spectroscopic techniques. ¹³C cross polarization (CP) NMR spectra of the kerogens confirmed the well-established pattern of increasing aromaticity with increasing thermal maturity. Spin counting showed that CP observability was around 50% for the immature kerogens, and only 14–25% for the mature kerogens. Spin counting also showed that the direct polarization (DP) observabilities were >80% for all but one of the kerogens. Despite the large differences in observability between the two techniques, aromaticities derived from corresponding CP and DP spectra differed by only 1–15%. The RESTORE technique showed that the low CP observability of the immature kerogens was due mostly to rapid T₁ᵨH relaxation, whereas both rapid T₁ᵨH relaxation and slow polarization transfer contributed to the low CP observability of the mature kerogens.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2006
Deposited On:28 Mar 2013 09:39
Last Modified:05 Apr 2016 16:43
Publisher:Elsevier
ISSN:0926-2040
Publisher DOI:https://doi.org/10.1016/j.ssnmr.2005.10.014
Permanent URL: https://doi.org/10.5167/uzh-76982

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