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Widespread natural methane and oil leakage from sub-marine Arctic reservoirs

Author

Listed:
  • Pavel Serov

    (UiT–The Arctic University of Norway)

  • Rune Mattingsdal

    (NPD—Norwegian Petroleum Directorate, Harstad Office)

  • Monica Winsborrow

    (UiT–The Arctic University of Norway)

  • Henry Patton

    (UiT–The Arctic University of Norway)

  • Karin Andreassen

    (UiT–The Arctic University of Norway)

Abstract

Parceling the anthropogenic and natural (geological) sources of fossil methane in the atmosphere remains problematic due to a lack of distinctive chemical markers for their discrimination. In this light, understanding the distribution and contribution of potential geological methane sources is important. Here we present empirical observations of hitherto undocumented, widespread and extensive methane and oil release from geological reservoirs to the Arctic Ocean. Methane fluxes from >7000 seeps significantly deplete in seawater, but nevertheless reach the sea surface and may transfer to the air. Oil slick emission spots and gas ebullition are persistent across multi-year observations and correlate to formerly glaciated geological structures, which have experienced km-scale glacial erosion that has left hydrocarbon reservoirs partially uncapped since the last deglaciation ~15,000 years ago. Such persistent, geologically controlled, natural hydrocarbon release may be characteristic of formerly glaciated hydrocarbon-bearing basins which are common across polar continental shelves, and could represent an underestimated source of natural fossil methane within the global carbon cycle.

Suggested Citation

  • Pavel Serov & Rune Mattingsdal & Monica Winsborrow & Henry Patton & Karin Andreassen, 2023. "Widespread natural methane and oil leakage from sub-marine Arctic reservoirs," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37514-9
    DOI: 10.1038/s41467-023-37514-9
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