Well logging in the petroleum industry developed over five decades into a mature industry, whereas geothermal well logging is a relatively new enterprise.

The present discussion focuses on the types of geothermal reservoirs encountered, geologic and reservoir engineering objectives, and qualitative and quantitative interpretive formation evaluation techniques based on geophysical wireline logs.

Specific field case studies illustrate the state-of-the-art technology, including examples from the Geyser dry

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steam field, California, hot water fields in California, Nevada, Utah, and Idaho, and the LASL hot dry rock project in the Valles Caldera of New Mexico.

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