1H spin-lattice relaxation time (
T1) of dispersed insoluble organic matter (kerogen) as measured by NMR gives a regular increase with increasing burial depth. This evidence is indicated by 94 analytical data in the six boreholes: MITI-Hamayuchi, MITI-Wakkanai, MITI-Embetsu, Tsubetsu, Yufutsu-oki B-4 and Nishikatakai SK-1 D and in the two outcrop sections, Umanokamiyama and Oashizawa. The
T1 versus vitrinite reflectance (
R0) suggests a linear relationship between the two variables with a high correlation coefficient.
T1 could be an evaluation parameter effective for organic maturation during burial diagenesis.
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