Natural H 2 in Kansas: Deep or shallow origin?

Abstract : A geochemical study of gas coming from three wells in northeastern Kansas supplements previous studies from the 1980s and points to a persistent regional phenomenon of H2 production. In 2008, a new well showed, just after drilling, a free gas phase with more than 80 mole % of H2, followed by water production associated with gas. This gas is mainly composed of N2, He, H2, and occasionally CH4, with changing proportions through time. A drastic decrease in H2 at the well was observed since the aquifer is produced, along with occasional recharges in H2 evidenced notably in the early phases of gas sampling. We demonstrate that this evolution of gas composition is closely associated to the well completion story. Accordingly, two distinct origins of H2 are proposed: (1) deep crustal H2: water reduction associated to iron oxidation in the Precambrian basement; (2) reactions occurring in the tubing, primarily attributed to high contents of reduced iron and/or dissolved organic carbon (DOC = 4.1 mg L−1) in the water. The low δD values averaging −760‰ are attributed to a low temperature process, possibly a re-equilibration with water. Furthermore, the suggested origins are supported by the observed gas associations: (a) deep crustal H2 with radiogenic gases (4He and 40Ar) and metamorphic N2 (δ15N averaging +2.5‰); (b) surficial H2 with methane produced in the sedimentary aquifer and the tubing by methanogenic organisms.
Type de document :
Article dans une revue
Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2017, 18 (5), pp.1841-1865. 〈10.1002/2016GC006544〉
Liste complète des métadonnées

Littérature citée [83 références]  Voir  Masquer  Télécharger
Contributeur : Françoise Bertrand <>
Soumis le : mercredi 13 septembre 2017 - 10:42:58
Dernière modification le : jeudi 7 février 2019 - 15:16:16
Document(s) archivé(s) le : jeudi 14 décembre 2017 - 12:20:02


Fichiers produits par l'(les) auteur(s)




Julia Guélard, Valérie Beaumont, Virgile Rouchon, F. Guyot, Daniel Pillot, et al.. Natural H 2 in Kansas: Deep or shallow origin?. Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2017, 18 (5), pp.1841-1865. 〈10.1002/2016GC006544〉. 〈hal-01582129〉



Consultations de la notice


Téléchargements de fichiers