Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6191
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dc.contributor.authorallEtiope, G; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallZwahlen, C.; EAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerlanden
dc.contributor.authorallAnselmetti, F. S.; EAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerlanden
dc.contributor.authorallKipfer, R.; EAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Water Resources and Drinking Water, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerlanden
dc.contributor.authorallSchubert, C. J.; EAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, Seestrasse 79, CH-6047 Kastanienbaum, Switzerlanden
dc.date.accessioned2010-11-08T07:05:00Zen
dc.date.available2010-11-08T07:05:00Zen
dc.date.issued2010en
dc.identifier.urihttp://hdl.handle.net/2122/6191en
dc.description.abstractNatural gas seeps in the Alpine region are poorly investigated. However, they can provide useful information regarding the hydrocarbon potential of sedimentary Alpine units and related geofluid migration, typically controlled by pressurized gas accumulations and tectonics. A gas seep located near Giswil, in the Swiss Northern Alps, was investigated, for the first time, for molecular and isotopic gas composition, methane flux to the atmosphere, and gas flux variations over time. The analyses indicated that the gas was thermogenic (CH4 > 96%; d13C1: )35.5& to )40.2&) and showed evidence of subsurface petroleum biodegradation (13C-enriched CO2, and very low C3+ concentrations). The source rock in the region is marine Type II kerogen, which is likely the same as that providing thermogenic gas in the nearby Wilen shallow well, close to Lake Sarnen. However, the lack of d13CCO2 and d13C3 data for that well prevented us from determining whether the Wilen and Giswil seeps are fed by the same reservoir and seepage system. Gas fluxes from the Giswil seep, measured using a closedchamber system, were significant and mainly from two major vents. However, a substantial gas exhalation from the soil occurs diffusely in an area of at least 115 m2, leading to a total CH4 output conservatively estimated to be at least 16 tonnes per year. Gas flux variations, monitored over a 1-month period by a special tent and flowmeter, showed not only daily meteorological oscillations, but also an intrinsic ‘pulsation’ with periods of enhanced flux that lasted 2–6 h each, occurring every few days. The pulses are likely related to episodes of gas pressure build-up and discharge along the seepage system. However, to date, no relationship to seismicity in the active Sarnen strike-slip fault system has been established.en
dc.language.isoEnglishen
dc.publisher.nameBlackwell Publishing Ltden
dc.relation.ispartofGeofluidsen
dc.relation.ispartofseries4/ 10 (2010)en
dc.subjectAlpsen
dc.subjectisotopesen
dc.subjectmethaneen
dc.subjectorganic geochemistryen
dc.subjectseepsen
dc.subjectSwitzerlanden
dc.titleOrigin and flux of a gas seep in the Northern Alps (Giswil, Switzerland)en
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber476-485en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistryen
dc.identifier.doi10.1111/j.1468-8123.2010.00302.xen
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dc.description.obiettivoSpecifico4.5. Studi sul degassamento naturale e sui gas petroliferien
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.contributor.authorEtiope, Gen
dc.contributor.authorZwahlen, C.en
dc.contributor.authorAnselmetti, F. S.en
dc.contributor.authorKipfer, R.en
dc.contributor.authorSchubert, C. J.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerlanden
dc.contributor.departmentEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerlanden
dc.contributor.departmentEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Water Resources and Drinking Water, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerlanden
dc.contributor.departmentEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, Seestrasse 79, CH-6047 Kastanienbaum, Switzerlanden
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerland-
crisitem.author.deptEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerland-
crisitem.author.deptEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Water Resources and Drinking Water, U¨ berlandstrasse 133, CH-8600 Du¨bendorf, Switzerland-
crisitem.author.deptEAWAG, Swiss Federal Institute of Aquatic Science & Technology, Department of Surface Waters Research and Management, Seestrasse 79, CH-6047 Kastanienbaum, Switzerland-
crisitem.author.orcid0000-0001-8614-4221-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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