Characterization of a geothermal system in the Upper Arkansas Valley, CO

2009 ◽  
Author(s):  
Thomas Blum ◽  
Kasper van Wijk ◽  
Lee Liberty ◽  
Michael Batzle ◽  
Richard Krahenbuhl ◽  
...  
Keyword(s):  
Geothermal System

scholarly journals FLUID GEOCHEMISTRY INVESTIGATIONS ON THE VOLCANIC SYSTEM OF METHANA

2007 ◽  
Vol 40 (2) ◽  
pp. 712
Author(s):  
W. D'Alessandro ◽  
L. Brusca ◽  
K. Kyriakopoulos ◽  
M. Margaritopoulos ◽  
G. Michas ◽  
...  
Keyword(s):  
Geothermal System ◽  
Volcanic System ◽  
Spatially Correlated ◽  
Co2 Output ◽  
Active Tectonic ◽  
Soil Site ◽  
Gas Hazard ◽  
Tectonic System ◽  
Cold Groundwaters

An extensive geochemical survey on the fluids released by the volcanic/geothermal system of Methana was undertaken. Characterization of the gases was made on the basis of the chemical and isotopie (He and C) analysis of 14 samples. CO2 soil gas concentration and fluxes were measured on the whole peninsula at more than 100 sampling sites. 31 samples of thermal and cold groundwaters were also sampled and analysed to characterize the geochemistry of aquifers. Anomalies referable to the geothermal system, besides at known thermal manifestations, were also recognized at some anomalous degassing soil site and in some cold groundwater. These anomalies were always spatially correlated to the main active tectonic system of the area. The total CO2 output of the volcanic system has been preliminary estimated in about 0.2 kg s~ . Although this value is low compared to other volcanic systems, anomalous C02 degassing at Methana may pose gas hazard problems. Such volcanic risk, although restricted to limited areas, cannot be neglected and further studies have to be undertaken for its better assessment.

Characterization of the geothermal system beneath the Northwest Geysers steam field, California, from seismicity and velocity patterns

Geothermics ◽  
1995 ◽  
Vol 24 (4) ◽  
pp. 471-487 ◽  
Author(s):  
Arturo E. Romero ◽  
Thomas V. McEvilly ◽  
Ernest L. Majer ◽  
Don Vasco
Keyword(s):  
Geothermal System

Reservoir characterization of the Paka geothermal system in Kenya: Insights from borehole PK-01

Geothermics ◽  
2022 ◽  
Vol 98 ◽  
pp. 102293
Author(s):  
Geoffrey Mibei ◽  
Björn S. Harðarson ◽  
Hjalti Franzson ◽  
Enikő Bali ◽  
Halldór Geirsson ◽  
...  
Keyword(s):  
Reservoir Characterization ◽  
Geothermal System

scholarly journals Degassing at the Volcanic/Geothermal System of Kos (Greece): Geochemical Characterization of the Released Gases and CO2 Output Estimation

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Kyriaki Daskalopoulou ◽  
Antonina Lisa Gagliano ◽  
Sergio Calabrese ◽  
Lorenza Li Vigni ◽  
Manfredi Longo ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Total Output ◽  
Geothermal System ◽  
Geothermal Systems ◽  
Geochemical Parameters ◽  
Co2 Output ◽  
Before And After ◽  
Flux Measurements ◽  
Of Greece

Forty-five gas samples have been collected from natural gas manifestations at the island of Kos—the majority of which are found underwater along the southern coast of the island. On land, two anomalous degassing areas have been recognized. These areas are mainly characterized by the lack of vegetation and after long dry periods by the presence of sulfate salt efflorescence. Carbon dioxide is the prevailing gas species (ranging from 88 to 99%), while minor amounts of N2 (up to 7.5%) and CH4 (up to 2.1%) are also present. Significant contents of H2 (up to 0.2%) and H2S (up to 0.3%) are found in the on-land manifestations. Only one of the underwater manifestations is generally rich in N2 (up to 98.9%) with CH4 concentrations of up to 11.7% and occasionally extremely low CO2 amounts (down to 0.09%). Isotope composition of He ranges from 0.85 to 6.71 R/RA, indicating a sometimes-strong mantle contribution; the highest values measured are found in the two highly degassing areas of Paradise beach and Volcania. C-isotope composition of CO2 ranges from -20.1 to 0.64‰ vs. V-PDB, with the majority of the values being concentrated at around -1‰ and therefore proposing a mixed mantle—limestone origin. Isotope composition of CH4 ranges from -21.5 to +2.8‰ vs. V-PDB for C and from -143 to +36‰ vs. V-SMOW for H, pointing to a geothermal origin with sometimes-evident secondary oxidation processes. The dataset presented in this work consists of sites that were repeatedly sampled in the last few years, with some of which being also sampled just before and immediately after the magnitude 6.6 earthquake that occurred on the 20th of July 2017 about 15 km ENE of the island of Kos. Changes in the degassing areas along with significant variations in the geochemical parameters of the released gases were observed both before and after the seismic event; however, no coherent model explaining those changes was obtained. CO2 flux measurements showed values of up to about 104 g×m−2×d−1 in both the areas of Volcania and Kokkino Nero, 5×104 g×m−2×d−1 at Paradise beach, and 8×105 g×m−2×d−1 at Therma spring. CO2 output estimations gave values of 24.6, 16.8, 12.7, and 20.6 t×d−1, respectively, for the above four areas. The total output of the island is 74.7 t×d−1 and is comparable to those of the other active volcanic/geothermal systems of Greece (Nisyros, Nea Kameni, Milos, Methana, and Sousaki).

Resistivity characterization of the Arjuno-Welirang volcanic geothermal system (Indonesia) through 3-D Magnetotelluric inverse modeling

2019 ◽  
Vol 174 ◽  
pp. 352-363 ◽  
Author(s):  
Yunus Daud ◽  
Wambra Aswo Nuqramadha ◽  
Fikri Fahmi ◽  
Rhyno Senbyla Sesesega ◽  
Fitrianita ◽  
...  
Keyword(s):  
Inverse Modeling ◽  
Geothermal System
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