Carbon dioxide degassing at Latera caldera (Italy): Evidence of geothermal reservoir and evaluation of its potential energy
Identifieur interne : 000141 ( Main/Exploration ); précédent : 000140; suivant : 000142Carbon dioxide degassing at Latera caldera (Italy): Evidence of geothermal reservoir and evaluation of its potential energy
Auteurs : G. Chiodini [Italie] ; A. Baldini [Italie] ; F. Barberi [Italie] ; M. L. Carapezza [Italie] ; C. Cardellini [Italie] ; F. Frondini [Italie] ; D. Granieri [Italie] ; M. Ranaldi [Italie]Source :
- Journal of Geophysical Research: Solid Earth [ 0148-0227 ] ; 2007-12.
English descriptors
- KwdEn :
- Acta, Active volcanoes, Anomalous, Anomaly, Aquifer, Average value, Barberi, Caldera, Carbon dioxide, Carbon dioxide degassing, Carbonate, Cardellini, Cavarretta, Central italy, Chemical composition, Chiodini, Cosmochim, Deep source, Degassing, Degassing process, Diffuse degassing, Diffuse emission, Dioxide, Earth planet, Endogenous, Experimental variogram, Fco2, Flux measurements, Flux surveys, Frondini, Geochemical, Geol, Geophys, Geothermal, Geothermal reservoir, Geothermal system, Geothermal systems, Geothermal wells, Gianelli, Giggenbach, Granieri, Hydrothermal, Hydrothermal systems, Isotopic, Isotopic composition, July, Kerrick, Latera, Latera caldera, Latera gases, Latera volcano, Latera wells, Lett, Liquid phase, Marini, Metamorphic, Naoh solution, Normal scores, October, October survey, Open circles, Pco2, Probability plot, Productive wells, Puzzolaie, Redox, Redox conditions, Southern italy, Statistical parameters, Sulphur mine, Tectonic, Total amount, Trds, Trds gases, Variogram, Volcanic, Volcano, Volcanol.
- Teeft :
- Acta, Active volcanoes, Anomalous, Anomaly, Aquifer, Average value, Barberi, Caldera, Carbon dioxide, Carbon dioxide degassing, Carbonate, Cardellini, Cavarretta, Central italy, Chemical composition, Chiodini, Cosmochim, Deep source, Degassing, Degassing process, Diffuse degassing, Diffuse emission, Dioxide, Earth planet, Endogenous, Experimental variogram, Fco2, Flux measurements, Flux surveys, Frondini, Geochemical, Geol, Geophys, Geothermal, Geothermal reservoir, Geothermal system, Geothermal systems, Geothermal wells, Gianelli, Giggenbach, Granieri, Hydrothermal, Hydrothermal systems, Isotopic, Isotopic composition, July, Kerrick, Latera, Latera caldera, Latera gases, Latera volcano, Latera wells, Lett, Liquid phase, Marini, Metamorphic, Naoh solution, Normal scores, October, October survey, Open circles, Pco2, Probability plot, Productive wells, Puzzolaie, Redox, Redox conditions, Southern italy, Statistical parameters, Sulphur mine, Tectonic, Total amount, Trds, Trds gases, Variogram, Volcanic, Volcano, Volcanol.
Abstract
In order to test the potentiality of soil CO2 diffuse degassing measurements for the study of underground mass and heat transfer in geothermal systems detailed surveys were performed at Latera caldera, which is an excellent test site, because of the abundant available subsurface data. Over 2500 measurements of soil CO2 flux revealed that endogenous CO2 at Latera caldera concentrates on a NE‐SW band coinciding with a structural high of fractured Mesozoic limestones hosting a water‐dominated high‐enthalpy geothermal reservoir. The total hydrothermal CO2 degassing from the structural high has been evaluated at 350 t d−1 from an area of 3.1 km2. It has been estimated that such a CO2 release would imply a geothermal liquid flux of 263 kg s−1, with a heat release of 239 MW. The chemical and isotopic composition of the gas indicates a provenance from the geothermal reservoir and that CO2 is partly originated by thermal metamorphic decarbonation in the hottest deepest parts of the system and partly has a likely mantle origin. The ratios of CO2, H2, CH4, and CO to Ar were used to estimate the T‐P conditions of the reservoir. Results cluster at T ∼ 200–300°C and PCO2 ∼ 100–200 bars, close to the actual well measurements. Finally, the approach proved to be an excellent tool to investigate the presence of an active geothermal reservoir at depth and that the H2‐CO2‐CH4‐CO‐Ar gas composition is a useful T‐P geochemical indicator for such CO2 rich geothermal systems.
Url:
DOI: 10.1029/2006JB004896
Affiliations:
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Chiodini</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Osservatorio Vesuviano, Istituto Nazionale di Geofisica e Vulcanologia, Naples</wicri:regionArea><wicri:noRegion>Naples</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Italie</country></affiliation></author><author><name sortKey="Baldini, A" sort="Baldini, A" uniqKey="Baldini A" first="A." last="Baldini">A. Baldini</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Scienze della Terra, Università di Perugia, Perugia</wicri:regionArea><wicri:noRegion>Perugia</wicri:noRegion></affiliation></author><author><name sortKey="Barberi, F" sort="Barberi, F" uniqKey="Barberi F" first="F." last="Barberi">F. Barberi</name><affiliation wicri:level="3"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Scienze Geologiche, Università di Roma Tre, Rome</wicri:regionArea><placeName><settlement type="city">Rome</settlement><region nuts="2">Latium</region></placeName></affiliation></author><author><name sortKey="Carapezza, M L" sort="Carapezza, M L" uniqKey="Carapezza M" first="M. L." last="Carapezza">M. L. Carapezza</name><affiliation wicri:level="3"><country xml:lang="fr">Italie</country><wicri:regionArea>Istituto Nazionale Geofisica e Vulcanologia, Rome</wicri:regionArea><placeName><settlement type="city">Rome</settlement><region nuts="2">Latium</region></placeName></affiliation></author><author><name sortKey="Cardellini, C" sort="Cardellini, C" uniqKey="Cardellini C" first="C." last="Cardellini">C. Cardellini</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Scienze della Terra, Università di Perugia, Perugia</wicri:regionArea><wicri:noRegion>Perugia</wicri:noRegion></affiliation></author><author><name sortKey="Frondini, F" sort="Frondini, F" uniqKey="Frondini F" first="F." last="Frondini">F. Frondini</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Scienze della Terra, Università di Perugia, Perugia</wicri:regionArea><wicri:noRegion>Perugia</wicri:noRegion></affiliation></author><author><name sortKey="Granieri, D" sort="Granieri, D" uniqKey="Granieri D" first="D." last="Granieri">D. Granieri</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Osservatorio Vesuviano, Istituto Nazionale di Geofisica e Vulcanologia, Naples</wicri:regionArea><wicri:noRegion>Naples</wicri:noRegion></affiliation></author><author><name sortKey="Ranaldi, M" sort="Ranaldi, M" uniqKey="Ranaldi M" first="M." last="Ranaldi">M. Ranaldi</name><affiliation wicri:level="3"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Scienze Geologiche, Università di Roma Tre, Rome</wicri:regionArea><placeName><settlement type="city">Rome</settlement><region nuts="2">Latium</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Geophysical Research: Solid Earth</title><title level="j" type="alt">JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><biblScope unit="vol">112</biblScope><biblScope unit="issue">B12</biblScope><biblScope unit="page-count">17</biblScope><date type="published" when="2007-12">2007-12</date></imprint><idno type="ISSN">0148-0227</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acta</term><term>Active volcanoes</term><term>Anomalous</term><term>Anomaly</term><term>Aquifer</term><term>Average value</term><term>Barberi</term><term>Caldera</term><term>Carbon dioxide</term><term>Carbon dioxide degassing</term><term>Carbonate</term><term>Cardellini</term><term>Cavarretta</term><term>Central italy</term><term>Chemical composition</term><term>Chiodini</term><term>Cosmochim</term><term>Deep source</term><term>Degassing</term><term>Degassing process</term><term>Diffuse degassing</term><term>Diffuse emission</term><term>Dioxide</term><term>Earth planet</term><term>Endogenous</term><term>Experimental variogram</term><term>Fco2</term><term>Flux measurements</term><term>Flux surveys</term><term>Frondini</term><term>Geochemical</term><term>Geol</term><term>Geophys</term><term>Geothermal</term><term>Geothermal reservoir</term><term>Geothermal system</term><term>Geothermal systems</term><term>Geothermal wells</term><term>Gianelli</term><term>Giggenbach</term><term>Granieri</term><term>Hydrothermal</term><term>Hydrothermal systems</term><term>Isotopic</term><term>Isotopic composition</term><term>July</term><term>Kerrick</term><term>Latera</term><term>Latera caldera</term><term>Latera gases</term><term>Latera volcano</term><term>Latera wells</term><term>Lett</term><term>Liquid phase</term><term>Marini</term><term>Metamorphic</term><term>Naoh solution</term><term>Normal scores</term><term>October</term><term>October survey</term><term>Open circles</term><term>Pco2</term><term>Probability plot</term><term>Productive wells</term><term>Puzzolaie</term><term>Redox</term><term>Redox conditions</term><term>Southern italy</term><term>Statistical parameters</term><term>Sulphur mine</term><term>Tectonic</term><term>Total amount</term><term>Trds</term><term>Trds gases</term><term>Variogram</term><term>Volcanic</term><term>Volcano</term><term>Volcanol</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Acta</term><term>Active volcanoes</term><term>Anomalous</term><term>Anomaly</term><term>Aquifer</term><term>Average value</term><term>Barberi</term><term>Caldera</term><term>Carbon dioxide</term><term>Carbon dioxide degassing</term><term>Carbonate</term><term>Cardellini</term><term>Cavarretta</term><term>Central italy</term><term>Chemical composition</term><term>Chiodini</term><term>Cosmochim</term><term>Deep source</term><term>Degassing</term><term>Degassing process</term><term>Diffuse degassing</term><term>Diffuse emission</term><term>Dioxide</term><term>Earth planet</term><term>Endogenous</term><term>Experimental variogram</term><term>Fco2</term><term>Flux measurements</term><term>Flux surveys</term><term>Frondini</term><term>Geochemical</term><term>Geol</term><term>Geophys</term><term>Geothermal</term><term>Geothermal reservoir</term><term>Geothermal system</term><term>Geothermal systems</term><term>Geothermal wells</term><term>Gianelli</term><term>Giggenbach</term><term>Granieri</term><term>Hydrothermal</term><term>Hydrothermal systems</term><term>Isotopic</term><term>Isotopic composition</term><term>July</term><term>Kerrick</term><term>Latera</term><term>Latera caldera</term><term>Latera gases</term><term>Latera volcano</term><term>Latera wells</term><term>Lett</term><term>Liquid phase</term><term>Marini</term><term>Metamorphic</term><term>Naoh solution</term><term>Normal scores</term><term>October</term><term>October survey</term><term>Open circles</term><term>Pco2</term><term>Probability plot</term><term>Productive wells</term><term>Puzzolaie</term><term>Redox</term><term>Redox conditions</term><term>Southern italy</term><term>Statistical parameters</term><term>Sulphur mine</term><term>Tectonic</term><term>Total amount</term><term>Trds</term><term>Trds gases</term><term>Variogram</term><term>Volcanic</term><term>Volcano</term><term>Volcanol</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">In order to test the potentiality of soil CO2 diffuse degassing measurements for the study of underground mass and heat transfer in geothermal systems detailed surveys were performed at Latera caldera, which is an excellent test site, because of the abundant available subsurface data. Over 2500 measurements of soil CO2 flux revealed that endogenous CO2 at Latera caldera concentrates on a NE‐SW band coinciding with a structural high of fractured Mesozoic limestones hosting a water‐dominated high‐enthalpy geothermal reservoir. The total hydrothermal CO2 degassing from the structural high has been evaluated at 350 t d−1 from an area of 3.1 km2. It has been estimated that such a CO2 release would imply a geothermal liquid flux of 263 kg s−1, with a heat release of 239 MW. The chemical and isotopic composition of the gas indicates a provenance from the geothermal reservoir and that CO2 is partly originated by thermal metamorphic decarbonation in the hottest deepest parts of the system and partly has a likely mantle origin. The ratios of CO2, H2, CH4, and CO to Ar were used to estimate the T‐P conditions of the reservoir. Results cluster at T ∼ 200–300°C and PCO2 ∼ 100–200 bars, close to the actual well measurements. Finally, the approach proved to be an excellent tool to investigate the presence of an active geothermal reservoir at depth and that the H2‐CO2‐CH4‐CO‐Ar gas composition is a useful T‐P geochemical indicator for such CO2 rich geothermal systems.</div></front></TEI><affiliations><list><country><li>Italie</li></country><region><li>Latium</li></region><settlement><li>Rome</li></settlement></list><tree><country name="Italie"><noRegion><name sortKey="Chiodini, G" sort="Chiodini, G" uniqKey="Chiodini G" first="G." last="Chiodini">G. Chiodini</name></noRegion><name sortKey="Baldini, A" sort="Baldini, A" uniqKey="Baldini A" first="A." last="Baldini">A. Baldini</name><name sortKey="Barberi, F" sort="Barberi, F" uniqKey="Barberi F" first="F." last="Barberi">F. Barberi</name><name sortKey="Carapezza, M L" sort="Carapezza, M L" uniqKey="Carapezza M" first="M. L." last="Carapezza">M. L. Carapezza</name><name sortKey="Cardellini, C" sort="Cardellini, C" uniqKey="Cardellini C" first="C." last="Cardellini">C. Cardellini</name><name sortKey="Chiodini, G" sort="Chiodini, G" uniqKey="Chiodini G" first="G." last="Chiodini">G. Chiodini</name><name sortKey="Frondini, F" sort="Frondini, F" uniqKey="Frondini F" first="F." last="Frondini">F. Frondini</name><name sortKey="Granieri, D" sort="Granieri, D" uniqKey="Granieri D" first="D." last="Granieri">D. Granieri</name><name sortKey="Ranaldi, M" sort="Ranaldi, M" uniqKey="Ranaldi M" first="M." last="Ranaldi">M. Ranaldi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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