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Carbon Dioxide Diffuse Soil Degassing: A Precious Tool For Identifying Productive Geothermal Reservoirs
Type
Oral presentation
Language
English
Obiettivo Specifico
4.5. Studi sul degassamento naturale e sui gas petroliferi
Editor(s)
Status
Published
Conference Name
Issued date
May 31, 2010
Conference Location
Puerto de la Cruz, Tenerife, Spain
Sponsors
Comission of Cities and Volcanoes (CaV) of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) Agencia Española de Cooperación Internacional para el Desarrollo (AECID), Gobierno de España Ministerio de Ciencia e Innovación (MICINN), Gobierno de España Unidad Militar de Emergencias (UME), Ministerio de Defensa, Gobierno de España Agencia Canaria de Investigación, Innovación y Sociedad de la Información (ACIISI), Gobierno de Canarias Viceconsejería de Infraestructuras y Planificación, Gobierno de Canarias Consejería de Turismo, Gobierno de Canarias Consejería de Medio Ambiente y Ordenación Territorial, Gobierno de Canarias Viceconsejería de Cultura y Deportes, Gobierno de Canarias Instituto Español de Oceanografía (IEO)Instituto Geológico y Minero de España (IGME)Instituto Geográfico Nacional (IGN)Academia Canaria de Seguridad Federación Canaria de Municipios (FECAM) Universidad de La Laguna (ULL)Instituto de Estudios Hispánicos de Canarias (IEHC) CajaCanarias
Keywords
Abstract
that deep wells find high temperatures but are not productive because they don’t cross any permeable fractured reservoir. Because of the high cost of deep drillings,
this aspect represents one of the main economic risk of geothermal exploration. The aim of this paper is to show that a detailed survey of diffuse CO2 soil flux allows
to identify from the surface the permeable portions of a deep-seated actively degassing geothermal reservoir, drastically reducing that risk. The first application
of the method has been made in the Quaternary Latera caldera, North of Rome. We will show that productive wells were all located on high CO2 flux zones, whereas
the not-productive wells were sited on low flux areas. In addition the survey allows to identify some as yet unexplored portions of the geothermal reservoir where future wells should be conveniently located. The same
technique has been applied in the geothermal exploration of Platanares and Azacualpa, Honduras and of Las Pailas, Costa Rica. Obviously, CO2 flux cannot provide
any estimate of temperature at depth, which has to be assessed with other geochemical or geophysical exploration techniques.
this aspect represents one of the main economic risk of geothermal exploration. The aim of this paper is to show that a detailed survey of diffuse CO2 soil flux allows
to identify from the surface the permeable portions of a deep-seated actively degassing geothermal reservoir, drastically reducing that risk. The first application
of the method has been made in the Quaternary Latera caldera, North of Rome. We will show that productive wells were all located on high CO2 flux zones, whereas
the not-productive wells were sited on low flux areas. In addition the survey allows to identify some as yet unexplored portions of the geothermal reservoir where future wells should be conveniently located. The same
technique has been applied in the geothermal exploration of Platanares and Azacualpa, Honduras and of Las Pailas, Costa Rica. Obviously, CO2 flux cannot provide
any estimate of temperature at depth, which has to be assessed with other geochemical or geophysical exploration techniques.
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Abstract
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