Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/14231
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dc.date.accessioned2021-01-18T07:04:47Z-
dc.date.available2021-01-18T07:04:47Z-
dc.date.issued2020-
dc.identifier.urihttp://hdl.handle.net/2122/14231-
dc.description.abstractWe studied a large dataset of 2600 shale gas samples from 76 geological formations in 38 sedimentary basins located in eleven countries. Shale gases contain mostly hydrocarbons dominated by methane. Shale gases can have primary microbial, secondary microbial and thermogenic origin. However, gases produced from most commercially successful shale plays (e.g., the Marcellus, Haynesville, Eagle Ford and Barnett in the USA, the Vaca Muerta in Argentina and the Wufeng-Longmaxi in China) are thermogenic. It appears that formations with greater gas endowment such as the Marcellus and the Haynesville contain late-mature thermogenic gas. Shale plays with early-mature thermogenic and secondary microbial gas such as the Antrim (USA) and the New Albany (USA) formations have relatively low endowments of recoverable gas. Shale plays with primary microbial gas are not significant from commercial exploration perspective. Isotope reversals (d13C of methane > d13C of ethane) are observed in shale plays with mature organic matter (vitrinite reflectance > 2%) that experienced significant uplift (>2 km). It appears that isotope fractionation during desorption from depressurized late-mature shales leads to isotope reversal in the residual gas produced from shale formations (e.g., the Wufeng-Longmaxi). Significant contribution of adsorbed gas (enriched in 13C-rich C2+ hydrocarbons relative to the co-occurring free gas) in the production from some plays (e.g., the Fayetteville, USA) may result in isotope rollovers.en_US
dc.language.isoEnglishen_US
dc.publisher.nameElsevieren_US
dc.relation.ispartofOrganic Geochemistryen_US
dc.relation.ispartofseries/143 (2020)en_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.titleGeochemistry of shale gases from around the world: Composition, origins, isotope reversals and rollovers, and implications for the exploration of shale playsen_US
dc.typearticleen
dc.description.statusPublisheden_US
dc.description.pagenumber103997en_US
dc.identifier.doi10.1016/j.orggeochem.2020.103997en_US
dc.description.obiettivoSpecifico6A. Geochimica per l'ambiente e geologia medicaen_US
dc.description.journalTypeJCR Journalen_US
dc.contributor.authorMilkov, Alexei V.-
dc.contributor.authorFaiz, Mohinudeen-
dc.contributor.authorEtiope, Giuseppe-
dc.contributor.departmentColorado School of Mines, Golden, CO, USAen_US
dc.contributor.departmentCSIRO, Pullenvale, Queensland, Australiaen_US
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italiaen_US
item.grantfulltextrestricted-
item.languageiso639-1en-
item.fulltextWith Fulltext-
item.openairetypearticle-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
crisitem.author.deptCSIRO, Pullenvale, Queensland, Australia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.orcid0000-0002-1082-4674-
crisitem.author.orcid0000-0001-8614-4221-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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