海洋沈殿物の有機炭素組成:酸素被曝が石油生成の可能性に与える影響
Y Gélinas1, J A Baldock, J I Hedges
1School of Oceanography, Box 357940, University of Washington, Seattle, WA 98195-7940, USA. ygelinas@alcor.concordia.ca
まとめ
沿岸地域のように,より短期間酸素にさらされた堆積有機物 (OM) は,石油生成の重要な指標である非タンパク質アルキル炭素を多く含んでいます. 深海の堆積物でよく見られる長時間の酸化物曝露は,この石油に弱い炭素を減少させます.
科学分野:
- 地質化学 地質化学
- オーガニック・ジオケミストリー
- 堆積地質学的地質学 堆積地質学的地質学
背景:
- 伝統的に,無酸素状態は,石油源岩の生成と関連しています.
- 新鮮な有機物質 (OM) の組成に対する堆積物の酸化還元条件の影響は不明である.
研究 の 目的:
- 酸化状態へのインシット被曝時間が,蓄積するOMの組成にどのように影響するか評価する.
- OMの組成と石油生産の可能性との関係を調査する.
主な方法:
- 固体13C核磁気共振 (NMR) スペクトロスコピーを使用した.
- 13C NMRスペクトルは,タンパク質および非タンパク質構造におけるアルキル炭素を定量化するために分析されました.
主要な成果:
- 酸化物曝露の期間と非タンパク質アルキル (アルキルNP) 炭素の豊富さとの間には逆の関係が観察されました.
- 短時間オキシトに曝露された沿岸の堆積物は,長期に曝露された深海の堆積物よりも,アルキルNPの炭素濃度が著しく高かった.
- アルキルNPに富んだサンプルには,タイプIの石油シェイルの特徴であるポリメチレン成分が含まれていた.
結論:
- 酸化物曝露の期間は,海洋堆積物中のOMの品質と石油生成の可能性に直接影響を与えます.
- 異なる酸化還元条件下でのOM組成を理解することは,石油探査において極めて重要です.
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