Water-Gas Sampling At Fenton Hill HDR Geothermal Area (Trujillo, Et Al., 1983)

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Exploration Activity: Water-Gas Sampling At Fenton Hill HDR Geothermal Area (Trujillo, Et Al., 1983)

Exploration Activity Details
Location Fenton Hill HDR Geothermal Area
Exploration Technique Water-Gas Sampling
Activity Date - 1983

Usefulness not indicated
DOE-funding Unknown

Samples of the geothermal fluids and gases were collected at regular intervals during each of the heat-extraction experiments from the production wellhead, the injection wellhead, and at the make-up pump that supplied water from storage ponds to replace the water lost downhole by permeation into the reservoir walls. Samples were analyzed to identify compositional changes in the produced fluid in order to study the reservoir behavior under normal (recirculating) operating conditions. Concentrations of certain dissolved species appear to be derived from the displacement of an indigenous pore-fluid, while others appear to be derived from dissolution of minerals present in the reservoir rock. Water sampled from the production well is relatively low in total dissolved solids and shows little tendency for corrosion or scaling. The authors attempt to relate the changes in the liquid and gas chemistry of the geothermal fluids to geochemical processes that resulted from the heat-extraction and flow testing experiments. Specifically, the application of the silica and Na-K-Ca geothermometers and the implications of the pore-fluid displacement theory are examined to evaluate the long-term effects of fluid geochemistry on heat extraction from HDR reservoirs. The results of the flow testing and heat-extraction experiments and of the chemical analysis of the geothermal fluids are reported by Dash et al. (1983) and Grigsby et al. (1983), and are summarized in numerous reports by other authors.


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