Hot Dry Rock

Hot Dry Rock

Hot crystalline rock with essentially no porosity and lacking producible hot water. Geothermal production from hot dry rock reservoirs is the primary goal of EGS (enhanced geothermal system) research in which cold water is injected and hot fluid is produced.

Geothermal Glossary

Word of the Week – Cement Bond Log

Word of the Week – Cement Bond Log

Cement Bond Log A geophysical well log that is obtained using a sonic-type tool on a wireline. The result helps to confirm the integrity of the hardened cement that was injected to form a bond between well casing and the adjacent rock formation.

Word of the Week – Chemical Geothermometer

Word of the Week – Chemical Geothermometer

Chemical Geothermometer A temperature that is calculated based on the chemical composition of a hydrothermal fluid and involves knowing a ratio (e.g., Na/K) or knowing the absolute concentration of a species (e.g., SiO2). Temperature is computed using a simple...

Word of the Week – Chlorite

Word of the Week – Chlorite

Chlorite A micaceous mineral that is commonly green-colored, composed of iron and/or magnesium, and forms due to hydrothermal alteration of amphiboles, pyroxenes, and feldspars.

Utah FORGE

Advancing innovative technologies to unlock Earth’s limitless geothermal energy.