PUMA
Istituto di Geoscienze e Georisorse     
Patella D., Rossi A., Tramacere A. First results of the application of the dipole electrical sounding method in the geothermal area of Travale-Radicondoli (Tuscany). In: Geothermics, vol. 8 pp. 111 - 134. Elsevier, 1979.
 
 
Abstract
(English)
A new geoelectric prospecting method has been testing in the Travale-Radicondoli geothermal area. This method is based on the dipolar technique that permits investigation at very great depths with much fewer problems than encoutered when using the classical electric prospecting techniques. The following steps were taken in order to operate with relatively low power from a 2kW generator: (i) the ground was energized with a series current square waves a at frequency of less than 0.05 Hz in order to avoid the effects electromagnetic coupling and induced polarization; (ii) the voltage was recorded digitally at measuring dipole; (iii) the voltage recordings were processed by spectral analysis method of "maximum likehood". The resulting apparent resistivity diagrams were trasformed into Schlumberger diagrams and then interpreted quantitatively. The six soundings are too limited in number to represent a real prospecting but refer to different geological and structural situations typical of a geothermal area. Two electrosoundings were sited for this purpose so as to be directly calibrated by the wells in the local geothermal field. The quantitative analysis of the resistivity diagrams in particular revealed the low resistivity values of the carbonate formation forming the geothermal reservoir, where the hot fluid circulation is particularly strong (15Om). The dipolar method has proved capable of distinguishing, in the geological situation of Travale Area, the various structural features of the geothermal field such as "cover", "reservoir", substratum, uplifted structures and tectonic depressions
URL: http://https://www.journals.elsevier.com/geothermics
Subject geoelectrics and electromagnetic methods
Travale


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