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The AAPG/Datapages Combined Publications Database
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* Gary H. Isaksen Exxon Production Research Company Houston, Texas, U.S.A. * ABSTRACT This study examines the molecular geochemistry of depositional environments with a predominance of terrigenous higher-plant organic matter. All analyses have been performed on thermally immature to early mature rocks in order to constrain molecular observations to organic facies and minimize any overprint by higher thermal maturity. Such studies, performed on rock samples, also enable calibration to optical (lithology and kerogen) and pyrolysis data, obviously not possible from oil studies. In general, these samples are characterized by high pristane/phytane ratios, strong predominance of odd-carbon n-alkanes, resin signatures among tricyclics, predominance of C29 regular steranes, hopane/sterane ratios up to 25, consistently low concentrations of homo-hopanes, and relatively high concentrations of oleanane in samples with high contents of angiosperm debris. Most samples were found to contain C24 tetracyclic terpanes, whereas C30 pentacyclic compounds, such as C30 17a(H) diahopane, were present only in some samples. The aromatic fractions were characterized by relatively high contents of cadalene, agathalene, and retene components. P2 pyrograms from programmed pyrolysis-GC displayed high contents of aromatics derived from the polycondensed aromatic network in lignins and tannins of higher plants. The oil-generative potential of these rocks is primarily a function of the kerogens content of high molecular weight (C20+) aliphatic hydrocarbons and hydrogen content. |
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