Basalt grey fine grained volcanic rock

Basalt

Dark grey fine grained volcanic rock composed of plagioclase, pyroxene and olivine, with relatively low silica (45-52 wt %). The composition reflects an upper mantle origin. Basalt is the most common type of volcanic rock on Earth, and it erupts from mid-ocean spreading ridges and hot spots (e.g., Hawaii and Iceland). The intrusive coarsely crystalline igneous rock equivalent is called gabbro.

Geothermal Glossary

Word of the Week – Steam-heated Water

Word of the Week – Steam-heated Water

Steam-heated water A shallow formed water resulting from condensation of steam into groundwater accompanied by absorption of carbon dioxide to form a bicarbonate water or by absorption of H2S that oxidizes to sulfate to produce an acid-sulfate water.

Word of the Week – Stimulation

Word of the Week – Stimulation

Stimulation An operation carried out on a well that increases production or injection by improving the flow characteristics of the reservoir and enhancing the flow between the reservoir and the wellbore.

Word of the Week – Stored Heat

Word of the Week – Stored Heat

Stored Heat Calculated thermal energy stored in a volume of hot rock. It is calculated using the rock volume, porosity, rock density, specific heat of rock, and the difference between the reservoir temperature and the background temperature given by the geothermal...

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