Origins of acid fluids in geothermal reservoirs



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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 HCl (Larderello, The Geysers) forms acid where it condenses or mixes with liquid at moderate temperatures (<300??C). The origin of steam with HCl is reaction of NaCl solid with rock minerals at high temperatures (>325??C). Cryptoacidity occurs at Los Humeros where HCl acidity is formed and neutralized without reaching the surface.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Origins of acid fluids in geothermal reservoirs
ISBN 0934412693
Volume 15
Year Published 1991
Language English
Publisher Publ by Geothermal Resources Council
Publisher location Davis, CA, United States
Larger Work Title Transactions - Geothermal Resources Council
First page 289
Last page 296
Conference Title 1991 Annual Meeting of the Geothermal Resources Council
Conference Location Sparks, NV, USA
Conference Date 6 October 1991 through 9 October 1991
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