Investigation of geothermal structures by magnetotellurics (MT): an example from the Mt. Amiata area, Italy

Volpi, Gianni; Manzella, Adele; Fiordelisi, A.

doi:10.1016/s0375-6505(03)00016-6

Cited by 57 publications

(24 citation statements)

References 11 publications

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“…Arango et al, 2009;Bernard et al, 1998;Volpia et al, 2003). MT can provide an excellent image of subsurface formations down to depths of 1e10 km and depending on the magnetometer features, the prospected depth can be increased to hundreds of kilometers.…”

Section: Introductionmentioning

confidence: 99%

Magnetotellurics applied to the study of the Guaraní aquifer in Entre Ríos Province, N–E Argentina

Favetto

Curcio

Pomposiello

2011

Journal of South American Earth Sciences

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Section: Introductionmentioning

confidence: 99%

Magnetotellurics applied to the study of the Guaraní aquifer in Entre Ríos Province, N–E Argentina

Favetto

Curcio

Pomposiello

2011

Journal of South American Earth Sciences

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“…For example, when permeability is supported by a few main fractures and faults, such as in the Amiata area in Italy, then alteration minerals are localized, and the decrease in resistivity is mainly caused by the presence of hydrothermal fluids and partial melt (Volpi et al, 2003).…”

Section: Clay Mineralsmentioning

confidence: 99%

“…Such methods (see Section 5.2 on Other methods) are usually unable to detect geothermal reservoirs deeper than 1-2 km. The natural-field MT method has also proved very useful for mapping near-surface low resistivity zones caused by rock alteration and saline pore fluids in geothermal areas (e.g., Hoover et al, 1976Hoover et al, , 1978Long and Kaufman, 1980;Ushijima et al, 1986;Haak et al, 1989;Ingham, 1991;Anderson et al, 1995;Uchida, 1995;Lagios et al, 1998;Mulyadi, 2000;Uchida et al, 2000;Bai et al, 2001;Hafizi et al, 2002;Caglar et al, 2005;Correia and Safanda, 2002;Risk et al, 2002;Pérez-Flores and Schultz, 2002;Wannamaker et al, 2002Wannamaker et al, , 2005Volpi et al, 2003;Ushijima et al, 2005).…”

Section: Magnetotelluric Studiesmentioning

confidence: 99%

Electromagnetic sounding of geothermal zones

Spichak

Manzella

2009

Journal of Applied Geophysics

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134

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“…Gravimetry is generally used as a prospecting method for underground structures at various scales (volcanoes, geothermal, gas and oil reservoirs, mineral resources, stratigraphy) and contributes to the static imagery in addition to other methods like magneto-tellurics (e.g., Volpi et al 2003, Newman et al 2008Geiermann and Schill 2010) or seismics (Concha et al 2010;Sanjuan et al 2010). Time-lapse gravimetry can also be a monitoring tool of any underground or surface mass redistribution and has many applications in volcanology (magmatic chamber evolution), hydrology (water storage changes in the critical zone), and geothermics.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of a geothermal reservoir by hybrid gravimetry; feasibility study applied to the Soultz-sous-Forêts and Rittershoffen sites in the Rhine graben

et al. 2015

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The study is devoted to the monitoring of a geothermal reservoir by hybrid gravimetry combining different types of instruments (permanent superconducting gravimeter, absolute ballistic gravimeter, and micro-gravimeters) and different techniques of measurements (both time-discrete and recording data collection). Using a micro-gravimetric repetition network around a reference station, which is regularly measured, leads to the knowledge of the time and space changes in surface gravity. Such changes can be linked to the natural or anthropic activities of the reservoir. A feasibility study using this methodology is applied to two geothermal sites in the Alsace region (France) of the Rhine graben. We show the results in terms of gravity double differences from weekly repetitions of a network of 11 stations around the geothermal reservoir of Soultz-sous-Forêts, separated into 5 loops during July-August 2013 and 2014 as well as preliminary results from 2 stations near Rittershoffen (ECOGI). We point out the importance of a precise leveling of the gravity points for the control of the vertical deformation. A first modeling of surface gravity changes induced by realistic geothermal density perturbations (Newtonian attraction) is computed in the frame of the existing geological model and leads to gravity changes below the μGal level being hence undetectable. However, and for the same case, borehole gravity modeling showed a significant anomaly with depth that can be used as a complementary monitoring method. We show that in the limit of our uncertainties (SD~5 μGal), we do not detect any significant gravity change on the geothermal site of Soultz in agreement with the fact that there was indeed no geothermal activity during our analysis period. On the contrary, the measurements near Rittershoffen show a signal above the noise level which correlates in time with a production test but cannot be explained in terms of Newtonian attraction effects according to our basic numerical simulation.

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Investigation of geothermal structures by magnetotellurics (MT): an example from the Mt. Amiata area, Italy

Cited by 57 publications

References 11 publications

Magnetotellurics applied to the study of the Guaraní aquifer in Entre Ríos Province, N–E Argentina

Magnetotellurics applied to the study of the Guaraní aquifer in Entre Ríos Province, N–E Argentina

Electromagnetic sounding of geothermal zones

Monitoring of a geothermal reservoir by hybrid gravimetry; feasibility study applied to the Soultz-sous-Forêts and Rittershoffen sites in the Rhine graben

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