Some Problems in Exploring Geothermal Resources

Abstract

Exploration of geothermal field should be regarded experimental because the condition of geothermal fields varies so greatly from one field to another. Practically geothermal condition in Italy differs greatly from New Zealand's geothermal fields. Nevertheless, the resemblance of geothermal structure between geothermal fields may be pointed out. Such a resemblance is basement fault which acts as the path of geothermal energy, geothermal reservoir and sometimes cap rock of reservoir.
Nature of geothermal fluids depends upon the characteristics of original fluids and geothermal structures.
To clarify these geothermal conditions, the following should be explored : nature of surface heat output, temperature distribution near the surface, hydrothermal alterations of rocks, geological structure, physical properties of rocks, underground water, magmatic mass, . heat output from drillhole, pressure and temperature distribution, chemistry of the discharge.
These exploration should be carried out systematically in accordance with regional survey, . preliminary reconnaissance, comprehensive survey and proving.
Methods and techniques used in these surveys are geological, geophysical and geochemical works, land surveying and drilling.
If we could develop our knowledge regarding geothermal features and techniques of exploration in geothermal fields, it would be possible to obtain more information concerning underground geothermal condition and consequently to develop the valuable resources of geothermal energy.