1887

Abstract

Summary

In this paper Magnetotelluric data were used to investigate the electrical resistivity structures of the Larderello-Travale geothermal system (LTGS) in southern Tuscany, Italy. MT data acquired by ENEL (Italian power company) in the ‘90 were re-analysed and two-dimensional inversions were performed along a E-W profile crossing the LTGS. The near surface inhomogeneity effects have been reduced by means of tensor decomposition and inversion for static shift. The integration of geological, geophysical and well data was performed in a three-dimensional environment (Petrel, Schlumberger) in order to improve the 2D MT inversion by setting a well-constrained a-priori model and to check inversion results supporting the interpretation. Despite the lithological features, it was clear that an important reduction of the electrical resistivity was required in the crystalline basement to fit experimental data. The results of the MT inversion along the profile have been compared with available public geophysical data.

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/content/papers/10.3997/2214-4609.201413727
2015-09-06
2019-12-15
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References

  1. Bertani, R., BertiniG., Cappetti, G., Fiordelisi, A., Marocco, B.M.
    [2005] An update of the Larderello-Travale/Radicondoli deep geothermal system. Proceedings World Geothermal Congress 2005, Antalya, Turkey.
    [Google Scholar]
  2. Bertani, R.
    [2015] Geothermal Power Generation in the World 2010–2014 Update Report. Proceedings World Geothermal Congress 2015, Melbourne, Australia, 1–19.
    [Google Scholar]
  3. Boccaletti, M., Gianelli, G. and Sani, F.
    [1997] Tectonic regime, granite emplacement and crustal structure in the inner zone of the Northern Apennines (Tuscany, Italy): A new hypothesis. Tectonophysics, 270, 127–143.
    [Google Scholar]
  4. Brogi, A., Lazzarotto, A., Liotta, D.
    and CROP 18 Working Group [2005] Structural features of southern Tuscany and geological interpretation of the CROP 18 Seismic Reflection Survey (Italy). Bollettino della Società Geologica Italiana, Special volume 3, 213–236.
    [Google Scholar]
  5. Cameli, G.M., Dini, I. and LiottaD.
    [1998] Brittle/Ductile boundary from seismic reflection lines of southern Tuscany (Northern Apennines, Italy). Memorie Società Geologica Italiana, 52, 152–162.
    [Google Scholar]
  6. De Matteis, R., Vanorio, T., Zoilo, A., Ciuffi, S., Fiordelisi, A. and Spinelli, E.
    [2008] Three-dimensional tomography and rock properties of the Larderello-Travale geothermal area, Italy. Physics of the Earth and Planetary Interiors, 168, 37–48.
    [Google Scholar]
  7. Dini, A., Gianelli, G., Puxeddu, M. and Ruggieri, G.
    [2005] Origin and evolution of Pliocene-Pleistocene granites from the Larderello geothermal field (Tuscan Magmatic Province, Italy), Lithos, 81, 1–31.
    [Google Scholar]
  8. Fiordelisi, A., Mackie, R., Manzella, A. and Zaja, A.
    [1998] Electrical features of deep structures in Southern Tuscany (Italy), Annals of Geophysics, 41(3), 333–341.
    [Google Scholar]
  9. Gamble, T.D., Goubau, W.M. and ClarkeJ.
    [1979] Magnetotellurics with a remote reference. Geophysics, 44, 53–68.
    [Google Scholar]
  10. Gianelli, G.
    [2008] A comparative analysis of the geothermal fields of Larderello and Mt Amiata, Italy. In: Ueckermann, H.I. (Eds) Geothermal energy research trends, Nova Science Publisher, 59–85.
    [Google Scholar]
  11. Larsen, J.C., Mackie, R.L., Manzella, A., Fiordelisi, A. and Rieven, S.
    [1996] Robust smooth magnetotelluric transfer functions, Geophysical Journal International, 124, 801–819.
    [Google Scholar]
  12. Manzella, A.
    [2004] Resistivity and heterogeneity of Earth crust in an active tectonic region, Southern Tuscany (Italy). Annals of Geophysics, 47(1), 107–118.
    [Google Scholar]
  13. Manzella, A., Spichak, V., Pushkarev, P., Sileva, D., Oskooi, B., Ruggieri, G. and Sizov, Y.
    [2006] Deep fluid circulation in the travale geothermal area and its relation with tectonic structure investigated by a magnetotelluric survey. Proceedings, Thirty-First Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California.
    [Google Scholar]
  14. Rodi, W., and Mackie, R.L.
    [2001] Nonlinear conjugate gradients algorithm for 2-D magnetotelluric inversion. Geophysics, 66, 174–187.
    [Google Scholar]
  15. Romagnoli, P., Arias, A., Barelli, A., Cei, M. and Casini, M.
    [2010] An updated numerical model of the Larderello-Travale geothermal system, Italy. Geothermics, 39, 292–313.
    [Google Scholar]
  16. Smith, J.T.
    [1995] Understanding telluric distortion matrices. Geophysical Journal International, 122(1), 219–226.
    [Google Scholar]
  17. Tuscan Region web site
    Tuscan Region web site, [2015] Continuum Geologico at scale 1:10000. Last accessed April 2015. http://www.regione.toscana.it/-/banche-dati-cartografia-geologica#Carta%20Geologica%20Regionale%201:10.000
    [Google Scholar]
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