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Volume 3, Issue 1
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Abstract

An integrated understanding of H generation, migration, trapping and preservation is required to facilitate H exploration. Hydrogen-rich gas discoveries in the São Francisco Basin in Brazil enable investigation of these processes in intracratonic settings. We used major gas, stable isotope and noble gas isotope geochemistry to develop an advanced geochemical framework that demonstrates, via multiple lines of evidence, migration of components into the basin from underlying cratonic basement. Mass balance shows that hydrogen and helium derive from outside of the fracture-controlled reservoirs from which they were sampled. Radiogenic noble gas data indicate at least two crustal sources for the accumulated gas, from different thermal environments; neon isotope data suggest that one of these is the Archean crystalline basement. The H- and He-bearing gases are associated with the eastern part of the basin, above the Pirapora Aulocagen, where thick-skinned deformation associated with the Araçuaí Orogeny may provide fluid-migration pathways between the basement and the basin fill. The Precambrian crystalline basement has a high H generation potential, but it was previously unknown whether basement-derived H gases could survive migration and accumulation without being entirely consumed by chemical and microbial reactions. While several wells contain an abiotic contribution to the alkane gases, indicating hydrogen consumption, H concentrations of up to 39% imply that, as with noble gases, it is possible for H to survive migration and accumulation on a regional scale. This discovery of natural H gas reservoirs supports a source–migration–trapping model, critical to define effective natural hydrogen plays, enabling economic exploration of this low-carbon resource.

© 2025 The Author(s). Published by The Geological Society of London for GSL and EAGE

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2025-07-29
2026-02-09

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Generation, migration and accumulation of natural hydrogen and helium in the intracratonic São Francisco Basin, eastern Brazil: implications for the understanding and exploration of natural H2 systems
Geoenergy 3, geoenergy2024-042 (2025); https://doi.org/10.1144/geoenergy2024-042
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