Title:

Application of Mineralogical Methods to Assess the Thermal Stabilities of Geothermal Reservoirs

Authors:

P.R.L. Browne

Conference:

Stanford Geothermal Workshop

Year:

1993

Session:

Geoscience

Language:

English

File Size:

586KB

View File:

Abstract:

Estimates of temperatures, past and present, in geothermal reservoirs can be made by using now standard mineralogical techniques, including fluid inclusion geothermometry, vitrinite reflectance, calc-silicate and clay occurrence, the extent of clay interlayering, and measuring clay crystallinity. Recent studies of clays in 60 drillcores from 6 wells at Wairakei, for example, show an inverse relationship between reservoir temperatures and crystallinities from 90' to 225'C (195 to 435?F) (Kiibler Indices: 1.40 to 0.44 A-28). Fluid inclusion geothermometry results require careful interpretation but the method need not be calibrated with respect to the reservoir, as do other geothermometric methods.


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