Formation evaluation is of great importance in geothermal development because of the high capital costs and the fact that successful exploration will only pay off through a subsequent decision to construct a power plant or other utilization f a c i l i t y . Since much formation data is available from well logging, development of new techniques of log interpretation for application to geothermal wells is called for. An analysis of potential nearterm benefits from this program and the types of formation data called for is discussed. Much useful information can be developed by adaptation of techniques used in oil and gas reservoirs, but the different demands of geothermal development from hydrocarbon production also open up new data requirements.

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