Scale Refers to deposition of minerals (e.g., calcite, silica, anhydrite, clays) in the well and reservoir that reduce...

Seismometer An instrument that records ground movement most often caused by earthquakes, volcanic eruptions and quarry...

Shear Fracture A pre-existing joint or fracture that accommodates shear displacement due to frictional slippage,...

Silica Sinter Horizontally banded deposit of amorphous silica that precipitates around neutral pH hot springs that are...

Slickwater Water that is injected during reservoir stimulation. It is modified with low concentrations of chemical...

Slotted Liner In geothermal wells, this is a type of production casing that does not go to the surface, and instead...

Spudding In Denotes the start of the well. The term originated from cable tool drilling where spudding is the act of...

Stable Isotopes Refers to non-radioactive isotopes of elements, including those of oxygen, hydrogen, carbon, sulfur,...

Steaming Ground Hot thermal ground associated with diffuse steam discharge. Vegetation is typically stunted or...

Steam-heated water A shallow formed water resulting from condensation of steam into groundwater accompanied by...

Stimulation An operation carried out on a well that increases production or injection by improving the flow...

Stored Heat Calculated thermal energy stored in a volume of hot rock. It is calculated using the rock volume,...