ABSTRACT
In any geothermal power generation project, whether it is a low-or high-enthalpy system, it is very important to know the geology, structural and tectonic regime of the area, and subsurface characteristics based on surface geophysical methods, as well as geochemical characteristics of the geothermal waters and gases. This pre-drilling stage of investigation helps to locate the exact sites for undertaking deep exploration/production drilling and hence reduces the cost of drilling. The selected examples of geothermal provinces described in this chapter will provide information on a variety of geological and tectonic features that control the circulation of fluids providing heat to the systems and evolution of geothermal waters and gases. The geological, geophysical and geochemical aspects are dealt with in detail.
