Origin of continuous hydrogen flux in gas manifestations at the Larderello geothermal field, Central Italy

2021 ◽  
Vol 585 ◽  
pp. 120564
Author(s):  
Mahmoud Leila ◽  
Dan Lévy ◽  
Anne Battani ◽  
Luigi Piccardi ◽  
Branimir Šegvić ◽  
...  
Keyword(s):  
Central Italy ◽  
Geothermal Field ◽  
Hydrogen Flux

scholarly journals Extensional shear zones as imaged by reflection seismic lines: the Larderello geothermal field (central Italy)

2003 ◽  
Vol 363 (1-2) ◽  
pp. 127-139 ◽  
Author(s):  
Andrea Brogi ◽  
Antonio Lazzarotto ◽  
Domenico Liotta ◽  
Giorgio Ranalli
Keyword(s):  
Central Italy ◽  
Shear Zones ◽  
Geothermal Field ◽  
Reflection Seismic ◽  
Seismic Lines

Fluid geochemistry and geothermometry in the unexploited geothermal field of the Vicano–Cimino Volcanic District (Central Italy)

2014 ◽  
Vol 371 ◽  
pp. 96-114 ◽  
Author(s):  
D. Cinti ◽  
F. Tassi ◽  
M. Procesi ◽  
M. Bonini ◽  
F. Capecchiacci ◽  
...  
Keyword(s):  
Central Italy ◽  
Geothermal Field ◽  
Fluid Geochemistry

scholarly journals Origin of the gases released from the Acqua Passante and Ermeta wells (Mt. Amiata, central Italy) and possible environmental implications for their closure

2014 ◽  
Vol 57 (4) ◽  
Author(s):  
Barbara Nisi ◽  
Orlando Vaselli ◽  
Franco Tassi ◽  
Javier de Elio ◽  
Marcelo Ortega ◽  
...  
Keyword(s):  
Central Italy ◽  
Geothermal Field ◽  
Surrounding Area ◽  
Environmental Implications ◽  
Gas Discharges ◽  
Soil Degassing ◽  
Local Municipality ◽  
The 19Th Century ◽  
Soil Flux ◽  
Soil Gases

<div class="page" title="Page 2"><div class="layoutArea"><div class="column"><p>The Mt. Amiata volcano (Tuscany, central Italy) hosts the second largest geothermal field of Italy. Its SW and NE sectors are characterized by the presence of several CO<span><sub>2</sub></span>-rich (&gt;95% by vol.) gas discharges. An intense Hg mining activity had taken place from the 19th century up to the end of the ’70s, particularly close to Abbadia San Salvatore, during which two drillings (Acqua Passante and Ermeta) intercepted a CO<span><sub>2</sub></span>-rich gas fertile horizon. The related gases are emitted in the atmosphere since 1938 and 1959, respectively, causing severe concerns for the local air quality. In this work the results of a geochemical and isotopic survey carried out on these gas emissions from March 2009 to January 2014 are presented. CO<span><sub>2</sub></span> fluxes from both the two wells and soil from an area of about 653,500 m<span><sup>2</sup></span> located between them were measured. The two wells are emitting up to 15,000, 92 and 8 tons y<span><sup>-1</sup></span> of CO<span><sub>2</sub></span>, CH<span><sub>4</sub></span> and H<span><sub>2</sub></span>S, respectively, while the computed soil CO<span><sub>2</sub></span> output was estimated at 4,311 ton y<span><sup>-1</sup></span>. The spatial distribution of the CO<span><sub>2</sub></span> soil flux suggests the presence of preferential patterns, indicating sites of higher permeability. Since the local municipality is evaluating the possibility to plug the Ermeta vent, a temporarily closure should first be carried out to test the possible influence of this operation on the diffuse soil degassing of deep-originated CO<span><sub>2</sub></span> in the surrounding area. This implies that diffuse soil gases should carefully be monitored before proceeding with its definitive closure.</p></div></div></div>

scholarly journals Drilling super-hot horizons of the Larderello geothermal field: insights from noble gases

2019 ◽  
Vol 98 ◽  
pp. 12012
Author(s):  
Gabriella Magro ◽  
Enrica Droghieri ◽  
Fabrizio Gherardi
Keyword(s):  
Supercritical Fluids ◽  
Noble Gases ◽  
Noble Gas ◽  
Central Italy ◽  
Geothermal Field ◽  
Drilling Fluids ◽  
Chemical Conditions ◽  
Seismic Reflectors ◽  
Binary Mixing ◽  
Deep Seated Fluids

In the frame of EU-funded DESCRAMBLE project, the Venelle 2 well was deepened down to 2900 m b.g.l. to test novel drilling techniques, and to improve the knowledge of physical-chemical conditions of super-hot horizons in the Larderello geothermal field, Central Italy. The major seismic reflectors present in the area were the target of the drilling, to verify their potential as geothermal reservoirs of supercritical fluids. No significant fluid entries were observed during the operations. Noble gases were analysed in the emerging drilling fluids to determine whether deep-seated fluids with a different signature than those currently discharged by productive wells entered the borehole. Despite the predominant atmospheric signature of the noble gas suite, 3He/4He values up to 1.59 Ra were measured, and the contribution of a deep component with ~4 Ra was hypothesised by extrapolation of binary mixing trends.

scholarly journals Modeling Highly Buoyant Flows in the Castel Giorgio: Torre Alfina Deep Geothermal Reservoir

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19 ◽  
Author(s):  
Giorgio Volpi ◽  
Fabien Magri ◽  
Francesca Colucci ◽  
Thomas Fisher ◽  
Mattia De Caro ◽  
...  
Keyword(s):  
Central Italy ◽  
Geothermal Field ◽  
Coupled Systems ◽  
Geothermal Reservoir ◽  
Geothermal System ◽  
Thermal Plumes ◽  
Buoyant Flows ◽  
Carbonate Formation ◽  
Deep Wells ◽  
Geothermal Wells

The Castel Giorgio-Torre Alfina (CG-TA, central Italy) is a geothermal reservoir whose fluids are hosted in a carbonate formation at temperatures ranging between 120°C and 210°C. Data from deep wells suggest the existence of convective flow. We present the 3D numerical model of the CG-TA to simulate the undisturbed natural geothermal field and investigate the impacts of the exploitation process. The open source finite-element code OpenGeoSys is applied to solve the coupled systems of partial differential equations. The commercial software FEFLOW® is also used as additional numerical constraint. Calculated pressure and temperature have been calibrated against data from geothermal wells. The flow field displays multicellular convective patterns that cover the entire geothermal reservoir. The resulting thermal plumes protrude vertically over 3 km at Darcy velocity of about7⁎10-8 m/s. The analysis of the exploitation process demonstrated the sustainability of a geothermal doublet for the development of a 5 MW pilot plant. The buoyant circulation within the geothermal system allows the reservoir to sustain a 50-year production at a flow rate of 1050 t/h. The distance of 2 km, between the production and reinjection wells, is sufficient to prevent any thermal breakthrough within the estimated operational lifetime. OGS and FELFOW results are qualitatively very similar with differences in peak velocities and temperatures. The case study provides valuable guidelines for future exploitation of the CG-TA deep geothermal reservoir.

Stress-induced changes to the flora in a geothermal field in central Italy

2015 ◽  
Vol 37 (10) ◽  
Author(s):  
Alice Pippucci ◽  
Roberto Lorenzi ◽  
Carmelina Spanò ◽  
Carlo Sorce
Keyword(s):  
Central Italy ◽  
Geothermal Field ◽  
Induced Changes

Fluid-driven anthropogenic micro-seismic activity while drilling towards supercritical conditions in the Larderello-Travale geothermal field

2020 ◽  
Author(s):  
Domenico Montanari ◽  
Riccardo Minetto ◽  
Thomas Plànes ◽  
Marco Bonini ◽  
Chiara Del Ventisette ◽  
...  
Keyword(s):  
Seismic Activity ◽  
Central Italy ◽  
Causal Link ◽  
Geothermal Field ◽  
Phase Changes ◽  
Critical Conditions ◽  
Periodic Pattern ◽  
Well Drilling ◽  
Geothermal Fluids ◽  
Geothermal Wells

&lt;p&gt;This study investigates the seismic activity occurring at the Larderello-Travale geothermal field (LTGF), central Italy, from June 2017 to January 2018. We deployed a network composed of 9 broadband stations around the Venelle 2 well drilling for supercritical fluids. During the experiment, we recognise a group of events that usually occur in swarms and that show a periodic pattern, a narrow frequency band, and almost identical waveforms. Their source is estimated to be located near the well, and their occurrence ceases after about 3 weeks from the conclusion of the drilling. We propose a causal link with the drilling operations where pressure fronts inside the well may promote phase changes and fluid flow across the drilled formations.&lt;/p&gt;&lt;p&gt;Our study sheds light on the anthropogenic seismic activity at the LTGF. More generally, we show that microseismic activity occurring during drilling in high-pressure and high-temperature conditions can remain at low magnitudes and that geothermal wells targeting geothermal fluids in such systems may be handled safely despite the critical conditions encountered at depth. The drilling of the Venelle 2 well is an encouraging example for the development of geothermal energy in critical conditions.&lt;/p&gt;

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