オクラホマ州の誘発性地震は,下水注入の深さと強く関連しています

Thea Hincks^1,2, Willy Aspinall^1,2,3, Roger Cooke^4,5

¹School of Earth Science, University of Bristol, Bristol BS8 1RJ, UK.

Science (New York, N.Y.)

|February 9, 2018

まとめ

汚染水の注入深さは,オクラホマ州に大きな影響を与える.

科学分野:

地震科学
地理学
環境科学

背景:

オクラホマ州は2009年以来荒水の注入に関連して震度が急増しました
誘発性地震における注入深さの正確な役割は,危険評価と規制のための複雑で重要な問題です.

研究の目的:

流水注入パラメータと地震性の関係を理解するための高度なモデルを開発する.
地震によるリスクを軽減するための最適な注入深さの戦略を特定する.

主な方法:

空間的,運用的,地震性パラメータ間の共同条件依存性をモデル化するための高度なベイジアンネットワークを開発した.
注入深さ,体積,速度,地震モメントの放出との相関を分析した.

主要な成果:

結晶底層に対する注入深さは,地震モメントの放出と最も強い相関を示した.
注射の深さと量の組み合わせは重要で,注射速度は地下層の接点の近くでより影響を与える.
地下から200~500メートルまでの注入深さを制限することで,地震モメントの放出を年間1.4~2.8倍減らすことができます.

結論:

地震による危険を大幅に軽減できます.
開発されたベイジアン・ネットワーク・アプローチは,廃棄水処理のための高リスクサブリージョンを特定するのにオペレーターと規制当局を助けます.

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