In the petroleum industry, well logging is a well-developed discipline that has matured over a fifty-year period, this, geothermal well logging is a very new field of activity. Compared to The current practice is to use the same logging equipment and the same log interpretation techniques for geothermal wells as had been used for petroleum wells, However, this approach has proven either inadequate or ineffective in most geothermal areas, The problems here are of two types (1) those associated with logging equipment and operation, and (2) those connected with log interpretation techniques, Temperatures encountered in geothermal wells are normally higher (greater than 175'C or 350'F) than those in petroleum wells. In many geothermal wells, some of the standard well logs cannot be run due to the well temperatures being higher than the maximum temperature for which those logging tools are designed. Lack of financial incentive has so far discouraged large investments by logging service companies in developing new logging instrumentation or interpretation techniques for geothermal wells, U.S. Department of Energy (formerly U.S. ERDA) has established a new geothermal logging hardware development program at the Sandia Laboratories in New Mexico. The U.S. Geological Survey also has a similar program of hardware development for geothermal logging. These programs have progressed well and there is a strong hope that most of the hardware-related problems of logging geothermal wells will be resolved over the next few years. Sanyal and Meidav (1977) have discussed the differences in the objectives of well logging in the geothermal reservoirs from those in the petroleum reservoirs, and their implications on the state-of-the-art of geothermal well logging. These authors have also discussed the problems associated with the logging operation, log quailty problems and log interpretation problems in the geothermal industry. interpretation aspects only.

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