新潟県東頸城地域における泥火山および周辺の原油・ガスの地球化学 Geochemistry of Crude Oils and Gases from Mud Volcanoes and Their Vicinities in the Higashi-Kubiki Area, Niigata Prefecture

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 Many surface oil and gas seepages including small mud volcanoes are found in the Higashi-Kubiki area, Niigata Prefecture. The purpose of this paper is to demonstrate the geochemical characteristics of these seepages and to discuss their source rocks and migration processes.<br> The geochemical characteristics of oils from the Kamou mud volcano show they derive from mature source rocks in the Lower Teradomari Formation. The gases collected from seepages including mud volcanoes are of a thermogenic origin and are slightly biodegraded based on their geochemical characteristics. The maturity of the gases inferred from their carbon isotopic compositions indicates that they were generated in the Lower Teradomari Formation which is more deeply buried than the source rocks of Kamou oil. Most of them probably migrated upward slowly in formations based on their high C<sub>1</sub>/ (C<sub>2</sub> + C<sub>3</sub>) ratios, and were biodegraded near the surface.<br> Our head-space gas analysis of two shallow boreholes shows that the head-space gas analysis is a useful tool for understanding the vertical distribution of absorbed gases, and the migration and alteration process of gases in a shallow subsurface.

収録刊行物

  • 地學雜誌

    地學雜誌 118(3), 455-471, 2009-07-07

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10030365674
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    10386278
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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