Tephra Airborne particles of rock and ash produced by an explosive volcanic eruption. Tephra commonly deposits as a...

THMC Acronym that stands for thermal, hydrological, mechanical, and chemical effects that is evaluated simultaneously...

Transcurrent Fault (Strike-Slip Fault) Vertically dipping fault that results from horizontal shear stress. Slip...

Two-Phase Flow A condition that is attained in production wells associated with high temperature (>200°C)...

Turbine Spinning axle mounted with fan blades that converts a fluid flow stream into mechanical energy. To produce...

Unconformity Geological term that refers to an ancient surface that has been buried and now represents a discontinuity...

Vadose Zone A hydrogeological term that represents the volume of rock and unconsolidated materials between the ground...

Vapor-Dominated Reservoir he highest grade of geothermal resource in which self-flowing wells produce dry steam from a...

Wairakite A zeolite mineral of hydrothermal origin that was first identified in the Wairakei geothermal field in New...

Well Casing Large diameter pipe that is assembled and inserted into newly drilled intervals of a well. The upper...

Wellhead Surface equipment at the top of a well (oil, gas, geothermal) that provides a structural and...

Well Logging Methods used to survey and characterize the physical and geological characteristics along and near the...