Abstract
In the geothermal Euganean area (Veneto region, NE Italy) water temperatures range from 60 to 86°C. The aquifer considered is rocky and the production wells in this study have a depth ranging from 300 to 500 m. For exploitation purposes, it is important to identify zones with a high probability that the temperature is more than 80°C and zones with a high probability that the temperature is less than 70°C. First, variographic analysis was conducted from 186 temperature data of thermal ground waters. This analysis gave results that are consistent with the main regional tectonic structure, the NW-SE trending “Schio-Vicenza” fault system. Then indicator variograms of the second, fifth, and eighth decile were compared to identify the spatial continuity at different thresholds. The unacceptability of a multigaussian hypothesis of the random function and the necessity to know the cumulative distribution function in any location, suggested the use of a nonparametric geostatistical procedure such as indicator kriging. Thus, indicator variograms at the cutoffs of 65, 70, 73, 75, 78, 80, 82, and 84°C were analyzed, fitted, and used during the indicator kriging procedure. Finally, probability maps were derived from postprocessing indicator kriging results. These maps identified scarcely exploited areas with a high probability of the temperature being higher than 80°C, between 70 and 80°C and areas with high probability of the temperature being below 70°C.
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REFERENCES
Antonelli, R., Fabbri, P., Iliceto, V., Majorana, C., Previatello, P., Schrefler, B. A., and Sedea, R., 1995, The hydrothermal Euganean field: A subsidence modelling approach: World Geothermal Congress, 18–31 May, Florence, p. 1263–1268.
Dal Piaz, G. V., Antonelli, R., Bellucci, L., Fabbri, P., Iliceto, V., Noto, P., Panichi, P., and Sedea, R., 1994, Relazione finale sulle ricerche sul Bacino Termale Euganeo: Unpubl. final report, Università di Padova—Regione Veneto, 40 p.
Deutsch, C. V., 1989, DECLUS: A Fortran 77 program for determining optimum spatial declustering weights: Computers & Geosciences, v. 15, no. 3, p. 325–332.
Deutsch, C.V., and Journel, A. J., 1998, GSLIB Geostatistical software library and user's guide: Oxford University Press, New York, 369 p.
Fabbri, P., 1997, Transmissivity in the Euganean Geothermal Basin: A geostatistical analysis: Ground Water, v. 35, no. 5, p. 881–887.
Goovaerts, P., 1997, Geostatistics for natural resource evaluation: Oxford University Press, New York, 483 p.
Isaaks, E. H., and Srivastava, M. R., 1989, An introduction to applied geostatistics: Oxford University Press, New York, 561 p.
Norton, D., and Panichi, C., 1978, Determination of the source and circulation paths of thermal fluids: The Abano region, northern Italy: Geochimica et Cosmochimica Acta, v. 42, p. 1283–1294.
Pannatier, Y., 1996, Variowin: Software for spatial data analysis in 2D: Springer, New York, 91 p.
Piccoli, G., Dal Prà, A., Sedea, R., Bellati, R., Di Lallo, E., Cataldi, R., Baldi, P., and Ferrara, G. C., 1973, Contributo alla conoscenza del sistema idrotermale Euganeo-Berico: Atti Acc. Naz. Lincei, v. XI, p. 103–131.
Sartori, S., Boaretto, E., Fabbri, P., Sveinbjornsdottir, A. E., and Heinemeier, J., 1997, 14C content of Euganean geothermal waters (Veneto, Italy): XVI International Radiocarbon conference, Groningen NL. (abstract).
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Fabbri, P. Probabilistic Assessment of Temperature in the Euganean Geothermal Area (Veneto Region, NE Italy). Mathematical Geology 33, 745–760 (2001). https://doi.org/10.1023/A:1011030900322
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DOI: https://doi.org/10.1023/A:1011030900322