モンゴル下部白亜系ズンバヤンオイルシェールの根源岩特性と推積環境 Source rock characteristics and depositional environment of Lower Cretaceous Dsunbayan oil shales, Mongolia

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Elemental analyses, Fischer assay pyrolysis, Rock-Eval pyrolysis and biomarker analyses were conducted for twenty-six lacustrine oil shales from the Lower Cretaceous Dsunbayan Group, Mongolia.<br>The Dsunbayan oil shales show large variations of organic carbon content (1.7-21.3wt%) and oil yield (0.3-11.8 wt%). A Rock-Eval pyrolysis shows that immature Type I kerogen dominates in these samples. Biomarker compositions show that major source organisms of the Dsunbayan oil shale were an autotrophic prokaryote such as a cyanobacterium, nonmarine algae, terrestrial higher plants, heterotrophic bacteria and bacterivorous ciliates.<br>Good correlations exist among organic carbon content, oil yield, bitumen content and n-heptadecane anomaly {2×n-C<sub>17</sub>/(n-C<sub>16</sub>+n-C<sub>18</sub>)n-alkane ratio}. The samples with high n-heptadecane anomaly are rich in β-carotane, which suggests that the degree of bottom water anoxia controlled organic carbon content and oil yield, and was related to the contribution of an autotrophic prokaryote which sourced dominant n-heptadecane.<br>High C/S ratio and little sulfur compound in the Dsunbayan oil shales indicate that they were deposited in a freshwater environment. The tropical-subtropical climate promoted thermal stratification and bottom water anoxia in the freshwater lakes. The degree of development of bottom-water anoxia was likely controlled by nutrient supply from the surrounding area.

収録刊行物

  • 石油技術協会誌

    石油技術協会誌 63(3), 239-250, 1998-05-01

    石油技術協会

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各種コード

  • NII論文ID(NAID)
    10011187874
  • NII書誌ID(NCID)
    AN00130976
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03709868
  • NDL 記事登録ID
    4498580
  • NDL 雑誌分類
    ZP29(科学技術--化学・化学工業--燃料--石油)
  • NDL 請求記号
    Z17-178
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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