Journal
SOLID STATE NUCLEAR MAGNETIC RESONANCE
Volume 27, Issue 1-2, Pages 140-148Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ssnmr.2004.08.001
Keywords
C-13 CP/MAS NMR; kerogen; thermal maturity; aromaticity; vitrinite reflectance; maceral composition; New Albany Shale
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Thermal maturity of oil and gas source rocks is typically quantified in terms of vitrinite reflectance, which is based on optical properties of terrestrial woody remains. This study evaluates C-13 CP/MAS NMR parameters in kerogen (i.e., the insoluble fraction of organic matter in sediments and sedimentary rocks) as proxies for thermal maturity in marine-derived source rocks where terrestrially derived vitrinite is often absent or sparse. In a suite of samples from the New Albany Shale (Middle Devonian to the Early Mississippian, Illinois Basin) the abundance of aromatic carbon in kerogen determined by 13C CP/MAS NMR correlates linearly well with vitrinite reflectance. (C) 2004 Elsevier Inc. All rights reserved.
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