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Table 5 NMR parameters of thermally stimulated kerogens

From: Composition and structure of natural organic matter through advanced nuclear magnetic resonance techniques

Kerogen R o (%)a F aro (%)b F alkyl (%)c F Oaro (%)d F naro (%)e F Haro (%)f F Haro/F aro F aro/ F alkyl χ gedge, min n hC, min
RJ25 0.36 47.4 46.3 7.57 38.7 1.10 0.02 1.02 0.18 4
R250 0.48 51.4 41.7 7.92 42.6 0.90 0.02 1.23 0.17 5
R300 0.52 54.9 40.1 7.65 44.4 2.80 0.05 1.37 0.19 6
R350 0.76 63.4 30.9 9.87 51.2 2.30 0.04 2.05 0.19 10
R400 1.40 82.7 14.1 8.90 56.6 17.2 0.21 5.89 0.32 22
R450 2.10 90.6 7.62 7.07 61.7 21.8 0.24 11.9 0.32 34
R500 2.69 94.7 4.94 5.46 63.0 26.2 0.28 19.2 0.33 38
  1. a R o is the vitrinite reflectance
  2. b F aro is the aromaticity
  3. c F alkyl is the fraction of nonpolar alkyl carbon
  4. d F Oaro is the fraction of aromatic C–O carbon
  5. e F naro is the fraction of nonpolar nonprotonated aromatic carbon
  6. f F Haro is the fraction of protonated aromatic carbon
  7. g χ edge, min is the fraction of minimum aromatic edge along the edges of the aromatic rings
  8. h n C, min is the minimum aromatic cluster size