In carrying out geothermal-energy development projects, an exhaustive
study has to be conducted on the local subsurface geothermal system ba
sed on extensive geothermal surveys and well data. The New Energy and
industrial Development Organization has had an extensive geothermal re
search program under way since 1987, known as the ''Nationwide Geother
mal Resources Exploration Project. ''In this program, the total analys
is system, which is called the ''Geothermal Expert Modelling System (G
EMS),'' has been developed to systematize all processes of building mo
dels of geothermal systems based on the various regional exploration d
ata. The aim of the system is to select narrow promising areas (about
50-60 square kilometers) for more elaborate exploration from within a
region extending over hundreds of square kilometers, by analyzing the
various explorations, and by building a geothermal system model of the
area. This scheme includes studies to consolidate individual geotherm
al survey data into an integrated data base and to work out a computer
-aided support system for building geothermal models. It calls for the
integration of these processes into a system on a user-friendly, engi
neering work-station that has sufficient graphic functions. An attempt
was made to actually identify promising areas in regions covered by w
ide-area surveys on hydrothermal systems, using the proposed total ana
lysis system.