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A VLF Survey in Vinadio Geothermal Area

In this study, after a brief introduction concerning geothermal energy and the usual geologic environment, in which geothermal exploration is usually conducted, it is described a VLF (Very Low Frequencies) survey carried out across the geothermal field of Bagni di Vinadio (Cuneo, Italy).
The main goal is to confirm the effectiveness of the geophysical VLF method in delineating subsurface conductive structures across an area with sub-vertical contacts between formations having strong resistivity contrasts.
The survey occurred on 28th November 2011 across a profile about 2500 m long, using a combined magnetometer/VLF system called Omni-VLF. This system has been designed and manufactured by EDA Instruments Inc. located in Toronto (Canada). VLF data have been analysed at three different frequencies (16 kHz, 19,6 kHz and 22,1 kHz) and then filtered with Fraser and Karous-Hjelt filters.
This data processing led for each frequency to modeled current density pseudo-sections of the profile, at two different hypothesized site resistivities. Comparing these data with previous geological maps, the presence of many sub-vertical contacts, zones of conductive geologic material and probable local buried sources of potentially exploitable hot water was confirmed.
In this way, VLF surveys prove to be one of the most effective geophysical method in qualitatively detecting new geothermal fields.

Mostra/Nascondi contenuto.
Giuliano Cappato – A VLF survey in Vinadio geothermal area - 11 - III.a INTRODUCTION With the increase in world population, industrialization and improvement in the standard of living, there has been a continuously increasing energy consumption. Obviously, a very sincere effort needs to be made both to limit this energy consumption and to find new sources of energy to maintain present standards of living in the developed countries and improve those of the developing countries. The existing energy supply and demand situation is such that very soon all the energy that could be obtained from all possible available sources would need to be harnessed. To improve the energy situation, efforts need to be made in the following three directions: - utilization of new methods for recovery, power generation and distribution; - reduction of using non-renewable sources of energy; - development and utilization of other energy sources and techniques. In this global framework, geothermal energy promises to play a fundamental role in supplying electric power, industrial process heating and heat for buildings. In general, geothermal power is cost effective, reliable, sustainable, and environmentally friendly: Earth’s heat is one of the most powerful sources of energy. To appreciate the potential of geothermal energy, it has been calculated that, through the cooling of our planet by 1°C, enough heat would be released to keep the whole world supplied with all its present-day electrical power needs for some forty million years. This vast source of energy is now beginning to be considered as a potential future supplier of global energy requirements. During last years, in order to detect new geothermal fields, many geophysical surveying methods have been much utilized, because they have no effective costs and large areas

Laurea liv.I

Facoltà: Ingegneria

Autore: Giuliano Cappato Contatta »

Composta da 129 pagine.

 

Questa tesi ha raggiunto 134 click dal 22/01/2013.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.