Geochemical study on the possibility of oil and gas accumulation in the Kii Peninsula, Japan

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  • 紀伊半島の石油・天然ガス資源に関する地球化学的考察
  • キイ ハントウ ノ セキユ テンネン ガス シゲン ニ カンスル チキュウ カ

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Abstract

To investigate a possibility of oil and gas accumulation, we analyzed surface sedimentary rocks and subsurface gases from the Neogene to the Mesozoic in the southern Kii Peninsula, Japan. Rock samples yielded total organic carbon (TOC of 0.20〜1.94% (av. 0.53%) and extractable hydrocarbon (HyR) of 9〜53 ppm (av.22 ppm). Plot of HyR versus TOC suggested most samples to be a lean oil source or a possible source of methane. Atomic H/C ratio of kerogen from the rock samples was 0.40〜0.66 (av. 0.49). Van Krevelen Diagram showed high maturities of these samples, but could not determine kerogen types. CH4 content of gas samples was 0.000〜93.7%, mostly being higher than 1%. Plot of C1/(C2+C3) versus δ13C(CH4)PDB indicated their hydrocarbons to be thermocatalytic products of organic matter. CH4 was likely to have been concentrated against other hydrocarbons during migration.

Journal

  • Chikyukagaku

    Chikyukagaku 21 (2), 65-74, 1987

    The Geochemical Society of Japan

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