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首页> 美国政府科技报告 >Evaluation of Low-Temperature Geothermal Potential in Cache Valley, Utah. Report of Investigation No. 174
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Evaluation of Low-Temperature Geothermal Potential in Cache Valley, Utah. Report of Investigation No. 174

机译：犹他州卡什谷的低温地热潜力评价。第174号调查报告

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Field work consisted of locating 90 wells and springs throughout the study area, collecting water samples for later laboratory analyses, and field measurement of pH, temperature, bicarbonate alkalinity, and electrical conductivity. Na exp + , K exp + , Ca exp +2 , Mg exp +2 , SiO sub 2 , Fe, SO sub 4-2 , Cl exp - , F exp - , and total dissolved solids were determined in the laboratory. Temperature profiles were measured in 12 additional, unused walls. Thermal gradients calculated from the profiles were approximately the same as the average for the Basin and Range province, about 35 exp 0 C/km. One well produced a gradient of 297 exp 0 C/km, most probably as a result of a near-surface occurrence of warm water. Possible warm water reservoir temperatures were calculated using both the silica and the Na-K-Ca geothermometers, with the results averaging about 50 to 100 exp 0 C. If mixing calculations were applied, taking into account the temperatures and silica contents of both warm springs or wells and the cold groundwater, reservoir temperatures up to about 200 exp 0 C were indicated. Considering measured surface water temperatures, calculated reservoir temperatures, thermal gradients, and the local geology, most of the Cache Valley, Utah area is unsuited for geothermal development. However, the areas of North Logan, Benson, and Trenton were found to have anomalously warm groundwater in comparison to the background temperature of 13.0 exp 0 C for the study area. The warm water has potential for isolated energy development but is not warm enough for major commercial development. (ERA citation 08:017701)

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