Multiple tracers for dis-connectivity of shallow aquifers, alluvium, and coal seam gas wells in the Great Artesian Basin

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dc.contributor.authorPearce, JKen_AU
dc.contributor.authorGolding, SDen_AU
dc.contributor.authorBaublys, KAen_AU
dc.contributor.authorHofmann, Hen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorHerbert, SJen_AU
dc.contributor.authorHayes, PJen_AU
dc.date.accessioned2024-12-06T03:51:57Zen_AU
dc.date.available2024-12-06T03:51:57Zen_AU
dc.date.issued2022-05-13en_AU
dc.date.statistics2024-07-11en_AU
dc.description.abstractThe potential for connectivity between water supply aquifers and gas reservoirs raises community, government, and scientific concerns. Methane can occur naturally, making it difficult to determine whether water bore methane levels are being influenced by nearby gas operations. This poses a challenge in the Surat Basin, where coal seam gas production operates alongside groundwater using industries (including feedlots, agriculture, mines). Water and gas samples were taken from water bores and coal seam gas (CSG) wells in the Walloon Coal Measures and from overlying aquifers (nominally, the Springbok, Gubberamunda, Orallo, and Mooga sandstones) and the Condamine Alluvium, for stable isotopes of gases, groundwater and dissolved inorganic carbon, as well as strontium isotopes. Most of the sampled water bores had isotopic signatures distinct from CSG wells, though a minority from gassy Springbok Sandstone and Walloon Coal Measure water bores could not be distinguished from CSG wells. In those few cases, neither connectivity or dis-connectivity could be confirmed. Alluvium and shallow aquifer samples have higher R36Cl values distinct from the older CSG production waters, as is the case with most 14C measurements. Waters from the Condamine River indicate potential surface water connectivity with the alluvium. The use of multiple tracers has shown that groundwater in some aquifers can be differentiated from groundwater in the coal seam gas reservoir and hence are useful tools in identifying where groundwater connectivity occurs. Understanding this connectivity forms another line of evidence to improve impact prediction models on a regional scale as well as providing information on connectivity in local groundwater investigations. © 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of APPEA.en_AU
dc.identifier.citationPearce, J. K., Golding, S. D., Baublys, K. A., Hofmann, H., Cendón, D. I., Herbert, S. J., & Hayes, P. J. (2022). Multiple tracers for dis-connectivity of shallow aquifers, alluvium, and coal seam gas wells in the Great Artesian Basin. The APPEA Journal, 62, S480-S486. doi:doi.org/10.1071/AJ21082en_AU
dc.identifier.issn1326-4966en_AU
dc.identifier.issn2206-8996en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleThe APPEA Journalen_AU
dc.identifier.paginations480-s486en_AU
dc.identifier.urihttps://doi.org/10.1071/aj21082en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15809en_AU
dc.identifier.volume62en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherCSIRO Publishingen_AU
dc.subjectAquifersen_AU
dc.subjectCoal gasen_AU
dc.subjectNatural gas wellsen_AU
dc.subjectArtesian basinsen_AU
dc.subjectMethaneen_AU
dc.subjectDissolved gasesen_AU
dc.subjectInorganic compoundsen_AU
dc.subjectStrontiumen_AU
dc.subjectIsotopesen_AU
dc.subjectGround wateren_AU
dc.subjectSandstonesen_AU
dc.titleMultiple tracers for dis-connectivity of shallow aquifers, alluvium, and coal seam gas wells in the Great Artesian Basinen_AU
dc.typeJournal Articleen_AU
dcterms.dateAccepted2022-02-24en_AU
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