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Modelisation des aquiferes thermaux avec des methodes geophysiques integrees

Belghazal, Hajar (2012) Modelisation des aquiferes thermaux avec des methodes geophysiques integrees. [Doctoral Thesis]



Written work here was undertaken in order to investigate geothermal reservoirs associated with major faults, located in Caldes de Montbui, Spain, and Sardara, Sardinia. This thesis has two independent parts. The first is a theoretical profile of geophysical methods applied in this work. The second focuses on the development of a methodology for cross-validation between the electromagnetic model (EM), densities models, and models of resistivity. The development and application of this methodology were in two hydrothermal environments. To improve the knowledge of the structural context of thermal aquifers, different complementary techniques, audio magnetotelluric measures (AMT), Time Domain Electromagnetic (TDEM), Tomography of the electrical resistivity (ERT) and Gravimetry, were made around the two areas of applications. The important physical parameter identified by MT methods is the electrical resistivity, which is particularly sensitive to the presence and the mineralization of the water. The three-dimensional modeling of the data allowed us to define the depth and the extent of hydrothermal levels. Despite some limitations, the MT method has proved well suited to study geothermal sites. There are several geophysical methods that have become industry standards, but they should not be used in isolation. However, the resistivity method is very useful, because it is directly related to the characteristics of geothermal reservoirs. In addition, because of the terrain of most geothermal areas and the profound nature of the reservoir, the TDEM combined with MT resistivity methods are becoming the methods of choice for geothermal exploration.

Item Type:Doctoral Thesis
Date:06 March 2012
Tutor:Ranieri, Gaetano, El Messari, Stitou Jamal
PhD classes:Ciclo 24 > Ingegneria del territorio
Coordinator:Querzoli, Giorgio
Institution:Universita' degli Studi di Cagliari
Divisions:Dipartimenti (fino a dicembre 2011) > Dipartimento di Ingegneria del territorio
Subjects:Area 04 - Scienze della terra > GEO/11 Geofisica applicata
Uncontrolled Keywords:geotermia, sistemi idrotermali, AMT, TDEM, TRI, gravimetria, Geothermic, modeling, hydrothermal systems, Structure, Audio magnetotelluric, Time Domain Electromagnetic, Tomography of the electrical resistivity, gravimetry
ID Code:699
Deposited On:20 Mar 2012 16:08

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