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  • Open Access
    Authors: 
    Monia Procesi; Giancarlo Ciotoli; Adriano Mazzini; Giuseppe Etiope;
    Publisher: Elsevier
    Countries: Italy, Germany
    Project: EC | LUSI LAB (308126)

    The Sediment-Hosted Geothermal Systems are hybrid geological systems, where geothermal and sedimentary domains interact, leading to mixtures of inorganic and biotic gases. They are named Sediment-Hosted Geothermal Systems (SHGS) or Sediment-Hosted Hydrothermal Systems (SHHS), a clear and univocal definition is not available. They are generally characterized by geothermal (thermometamorphic or mantle-derived) CO2 and thermogenic CH4, and occur in sedimentary basins crossed by magmatic intrusions or involved in volcanic plumbing systems. These systems can be of considerable interest for petroleum exploration and global climate change studies but systematic studies aimed to pinpoint an univocal definition, a detailed characterization and a worldwide location, are quite scarce. Here, we offer a first global review of the potential Sediment-Hosted Geothermal (or Hydrothermal) Systems focusing on: definition; development of an investigation methodology; geochemical and geological characterization of the new identified systems; worldwide mapping of potential SHG(H)S areas and discussion of the environmental and energy implications. We clarify the different meaning between hydrothermal and geothermal and we propose the univocal use of the term Sediment-Hosted Geothermal Systems (SHGS). We propose an investigation methodology and, following it, eight new SHG(H)Ss have been identified. These are located in Italy, Western U.S.A.-Wyoming, Japan and Taiwan. The identified SHGSs have CO2 mean concentration between 66 and 98 vol.% and CH4 mean concentration between 0.95 and 32 vol.%. The CO2 is inorganic and related to the decarbonation processes and magma/mantle degassing whereas the CH4 is thermogenic and associated to the last stages of catagenesis. The sites are mainly located in geodynamic active regimes as back-arc basins, rift zones and foredeep basins. They are not far from volcano complexes and hydrocarbon fields, the distance is within 75 km. They are characterized by anomalous heat flux (>50mW/m2), included between 75 and 190 mW/m2, and basin sediment thickness major than 1000 meters. Following these parameters, a first global map of potential SHGS areas has been created. The obtained results represent an important step toward a better knowledge of the SHGSs providing essential information for the climate change studies, petroleum exploration and development of new energy scenarios.

Include:
1 Research products, page 1 of 1
  • Open Access
    Authors: 
    Monia Procesi; Giancarlo Ciotoli; Adriano Mazzini; Giuseppe Etiope;
    Publisher: Elsevier
    Countries: Italy, Germany
    Project: EC | LUSI LAB (308126)

    The Sediment-Hosted Geothermal Systems are hybrid geological systems, where geothermal and sedimentary domains interact, leading to mixtures of inorganic and biotic gases. They are named Sediment-Hosted Geothermal Systems (SHGS) or Sediment-Hosted Hydrothermal Systems (SHHS), a clear and univocal definition is not available. They are generally characterized by geothermal (thermometamorphic or mantle-derived) CO2 and thermogenic CH4, and occur in sedimentary basins crossed by magmatic intrusions or involved in volcanic plumbing systems. These systems can be of considerable interest for petroleum exploration and global climate change studies but systematic studies aimed to pinpoint an univocal definition, a detailed characterization and a worldwide location, are quite scarce. Here, we offer a first global review of the potential Sediment-Hosted Geothermal (or Hydrothermal) Systems focusing on: definition; development of an investigation methodology; geochemical and geological characterization of the new identified systems; worldwide mapping of potential SHG(H)S areas and discussion of the environmental and energy implications. We clarify the different meaning between hydrothermal and geothermal and we propose the univocal use of the term Sediment-Hosted Geothermal Systems (SHGS). We propose an investigation methodology and, following it, eight new SHG(H)Ss have been identified. These are located in Italy, Western U.S.A.-Wyoming, Japan and Taiwan. The identified SHGSs have CO2 mean concentration between 66 and 98 vol.% and CH4 mean concentration between 0.95 and 32 vol.%. The CO2 is inorganic and related to the decarbonation processes and magma/mantle degassing whereas the CH4 is thermogenic and associated to the last stages of catagenesis. The sites are mainly located in geodynamic active regimes as back-arc basins, rift zones and foredeep basins. They are not far from volcano complexes and hydrocarbon fields, the distance is within 75 km. They are characterized by anomalous heat flux (>50mW/m2), included between 75 and 190 mW/m2, and basin sediment thickness major than 1000 meters. Following these parameters, a first global map of potential SHGS areas has been created. The obtained results represent an important step toward a better knowledge of the SHGSs providing essential information for the climate change studies, petroleum exploration and development of new energy scenarios.

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