Diagenetic alteration of organic matter (hydrocarbons) in Shinjo sedimentary rocks of Miocene age

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Hydrocarbons extracted from sedimentary rocks (Shinjo oil field, northeastern Japan, Miocene) were analyzed by using capillary gas chromatography and gas chromatography-mass spectrometry. The following compounds were identified: C13-C38 n-alkanes, C27-C30 steranes with configurations at C-5, C-14, C-17 (α or β) and at C-20 (R or S), C27-C29 diasteranes with configurations at C-13, C-17 (α or β) and at C-20 (R or S), C27-C29 sterenes, mono- and tri-aromatized steranes, hopanes, naphthalene and its alkyl (C1-C4) derivatives, phenanthrene and its alkyl (C1-C3) derivatives, pyrene, fluoranthene, chrysene, and perylene.With increasing burial (diagenesis), decrease of CPI of n-alkanes to 1.0, epimerization of 20R steranes to 20S ones, aromatization of steranes, and increase of polynuclear aromatic hydrocarbons were observed.
日本堆積学会の論文