| Title | Origins of Acid Fluids in Geothermal Reservoirs |
|---|---|
| Authors | Truesdell, Alfred H. |
| Year | 1991 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Reservoir Engineering; Reservoir Parameters; Brine Technology; Thermodynamic Properties; Volcanos; Chloride; Chemical Analysis; Super Heat; Water Rock Reaction; HCI |
| Abstract | Acid fluids in geothermal reservoirs are rare. Their occurrence in geothermal systems associated with recent volcanism (Tatun, Sumikawa, Miravalles) probably indicates that the geothermal reservoir fluid was derived from volcanic fluid incompletely neutralized by reaction with feldspars and micas. Superheated steam containing HC1 (Larderello, the Geysers) forms acid where it condenses or mixes with liquid at moderate temperatures (<300°C). The origin of steam with HC1 is reaction of NaC1 solid with rock minerals at high temperatures (>325°C). Cryptoacidity occurs at Los Humeros where HC1 acidity is formed and neutralized without reaching the surface. |