Molecular hydrogen in surface and subsurface natural gases: Abundance, origins and ideas for deliberate exploration

Milkov, Alexei V.

doi:10.1016/j.earscirev.2022.104063

Cited by 28 publications

(21 citation statements)

References 259 publications

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“…Our findings suggest that hydrogen fuels a rich mosaic of microbial metabolisms leading to extensive microbial productivity in the studied aquifer ecosystems (Fig 9), underlining the importance of hydrogen in the terrestrial subsurface (58). Key guilds in these ecosystems were hydrogenotrophic methanogens which provide methane for abundant methanotrophs.…”

Section: Versatile Microbial Lineages Metabolisms and Niches In Groun...mentioning

confidence: 63%

Hydrogen and dark oxygen drive microbial productivity in diverse groundwater ecosystems

Ruff

Humez

Angelis

et al. 2022

Preprint

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Groundwater ecosystems are globally widespread yet still poorly understood. We investigated the age, aqueous geochemistry, and microbiology of 138 groundwater samples from 87 monitoring wells (<250m depth) located in 14 aquifers in the Canadian Prairie. Geochemistry and microbial ecology were tightly linked revealing large-scale aerobic and anaerobic hydrogen, methane, nitrogen, and sulfur cycling carried out by diverse microbial communities. Older groundwaters contained on average more cells (up to 1.4×107/mL) than younger groundwaters. Organic carbon-rich strata featured some of the highest abundances, challenging current estimates of global groundwater population sizes. Substantial concentrations of dissolved oxygen (n=57; 0.52±0.12 mg/L [mean ± SE]; 0.39 mg/L [median]) in older groundwaters could support aerobic lifestyles in subsurface ecosystems at an unprecedented scale. Metagenomics, oxygen isotope analyses and mixing models indicated that microbial ″dark oxygen″ contributed to the dissolved oxygen pool in subsurface ecosystems commonly assumed to be anoxic.

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Section: Versatile Microbial Lineages Metabolisms and Niches In Groun...mentioning

confidence: 63%

Hydrogen and dark oxygen drive microbial productivity in diverse groundwater ecosystems

Ruff

Humez

Angelis

et al. 2022

Preprint

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“…In some countries, H 2 is not classified as a minable resource; thus, a reclassification of natural H 2 , is necessary in order to obtain exploration and production permits in different geographical locations. Besides the search for large natural H 2 deposits, the degassing of water from wells drilled into fractured serpentines, 140 may also prove a viable H 2 source, to be further investigated, during which hydraulic fracturing technologies may be applicable.…”

Section: Complementary Overview Of Underground Hydrogen Storage and N...mentioning

confidence: 99%

Perspectives and prospects of underground hydrogen storage and natural hydrogen

Epelle

Obande

Udourioh

et al. 2022

Sustainable Energy Fuels

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“…Our aim is to differentiate between active (present-day) flows and stocks (i.e., accumulations), with the latter arising from a combination of ancient (possibly fossil) and ongoing H 2 generation processes. Although multiple sources of geologic H 2 in the subsurface are recognized ( 6 , 8 ), our analysis concentrates on three scenarios that are particularly relevant to the ophiolitic context ( 5 , 8 , 17 – 21 , 28 , 30 ).…”

Section: Revealing the Presence Of A Deep Reservoirmentioning

confidence: 99%

A deep reservoir for hydrogen drives intense degassing in the Bulqizë ophiolite

Truche,

Donzé,

Goskolli

et al. 2024

Science

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Deep crustal production of hydrogen (H 2 ) is a potential source of primary energy if recoverable accumulations in geological formations are sufficiently large. We report direct measurements of an elevated outgassing rate of 84% (by volume) of H 2 from the deep underground Bulqizë chromite mine in Albania. A minimum of 200 tons of H 2 is vented annually from the mine’s galleries, making it one of the largest recorded H 2 flow rates to date. We cannot attribute the flux solely to the release of paleo-fluids trapped within the rocks or to present-day active and pervasive serpentinization of ultramafic rocks; rather, our results demonstrate the presence of a faulted reservoir deeply rooted in the Jurassic ophiolite massif. This discovery suggests that certain ophiolites may host economically useful accumulations of H 2 gas.

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Molecular hydrogen in surface and subsurface natural gases: Abundance, origins and ideas for deliberate exploration

Cited by 28 publications

References 259 publications

Hydrogen and dark oxygen drive microbial productivity in diverse groundwater ecosystems

Hydrogen and dark oxygen drive microbial productivity in diverse groundwater ecosystems

Perspectives and prospects of underground hydrogen storage and natural hydrogen

A deep reservoir for hydrogen drives intense degassing in the Bulqizë ophiolite

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