主要なN2-Heガスのフィールド形成
Anran Cheng1, Barbara Sherwood Lollar2, Jon G Gluyas3
1Department of Earth Sciences, University of Oxford, Oxford, UK. anran.cheng@earth.ox.ac.uk.
Nature
|March 1, 2023
まとめ
地殻の深層にある窒素は,沈殿体盆地でガス相を形成し,ヘリウムと水素資源を集中させることができる. この発見は既存のガス輸送モデルに挑戦し,資源探査にも影響を及ぼします.
科学分野:
- 地化学
- 地質学
- 地理学
背景:
- 大陸の深い地殻は ヘリウム,窒素,水素を絶えず生成しています
- 現在のモデルは,ガスが水に溶け,拡散によって運ばれていると仮定しています.
- ヘリウムを利用可能な資源に集中させるには,ガス相の溶解が不可欠です.
研究 の 目的:
- 地殻の窒素が沈殿体盆地で自由気相を形成できるかどうかを調査する.
- このガス相形成がヘリウムと水素資源に及ぼす影響を決定する.
- 大陸地殻の概念的な脱ガスモデルを精製する.
主な方法:
- ガス拡散モデルと堆積層の進化を組み合わせる
- ウィリストン流域のデータを使っています クラシックな内層流域です
- 窒素とヘリウムの濃度と相性を分析する.
主要な成果:
- 地殻の窒素は,安定した状態で脱ガスし,堆積層の底部で飽和状態に達します.
- フリーガスの相,主に窒素-ヘリウム, ウィリストン盆地で約1億4000万年前に形成された.
- このメカニズムは,観察された窒素-ヘリウムガスの堆積を説明し,同時に発生する水素ガスを予測します.
結論:
- 窒素ガスの形成は,沈殿盆地におけるヘリウムと水素資源を集中させるための重要なメカニズムである.
- このプロセスは,相溶性バッファリングにより,ヘリウムの流れを約30%減少させます.
- この調査結果は,世界の海域内のヘリウムと水素の潜在能力を評価するための定量的な洞察を提供します.
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