Fluid Inclusion Analysis At Coso Geothermal Area (1999)

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Exploration Activity: Fluid Inclusion Analysis At Coso Geothermal Area (1999)

Exploration Activity Details
Location Coso Geothermal Area
Exploration Technique Fluid Inclusion Analysis
Activity Date 1999

Usefulness not indicated
DOE-funding Unknown

 
Exploration Basis
Well and steam sample comparison
 
Notes
Vein and alteration assemblages from eight Coso wells have been collected and their fluid-inclusion gases analyzed by quadrupole mass spectrometry. Four major types of alteration were sampled: 1) young calcite-hematite-pyrite veins; 2) wairakite or epidote veins and alteration that are spatially associated with deep reservoirs in the main field and eastern wells; 3) older sericite and pyrite wallrock alteration; and 4) stilbite-calcite veins that are common in cooler or marginal portions of the geothermal area. The gas compositions of the fluid inclusions display systematic differences among the secondary assemblages. This signature is similar to the present-day gas analyses from steam samples taken from both the Devil’s Kitchen fumarole area and from Coso production wells.

 
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