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Assessment of Identified Geothermal Resources

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Assessment of Identified Geothermal Resources ( assessment-identified-geothermal-resources )

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Contents Abstract................................................................................................................................................................ 1 Introduction .......................................................................................................................................................... 1 Background .......................................................................................................................................................... 2 Geothermal Resource Terminology ..................................................................................................................... 2 The Volume Method............................................................................................................................................. 3 Temperature and Chemical Geothermometers .................................................................................................... 5 Reservoir Volume................................................................................................................................................. 8 Geothermal Recovery Factor ............................................................................................................................... 9 Electric Power Estimates and Monte Carlo Uncertainty Analyses...................................................................... 12 Summary............................................................................................................................................................ 13 Acknowledgements ............................................................................................................................................ 14 References......................................................................................................................................................... 14 Figures Figure 1. McKelvey diagram representing geothermal resource and reserve terminology. ......................... 18 Figure 2. Utilization efficiency as a function of temperature for existing geothermal power plants........................................................................................................................................................... 19 Figure 3. Graph of the solubility curves for quartz and chalcedony. ............................................................ 20 Figure 4. Histogram for 10oC increments of temperatures calculated with the Na-K-Ca-Mg geothermometer for the geothermal systems identified in USGS Circular 790. ............................................ 21 Figure 5. Histogram for 10oC increments of temperatures calculated with the K-Mg geothermometer for the geothermal systems (with reported Mg concentrations) identified in USGS Circular 790................................................................................................................................................... 22 Figure 6. Distribution of flow capacity across the reservoir permeable volume for the fractured reservoir model of Bodvarsson and Tsang and the Beowawe and Dixie Valley) geothermal fields............... 23 Figure 7. Fracture flow distributions for the uniform fracture model and self-similar models. ...................... 24 Figure 8. Distribution of flow capacity from figure 6 with the predictions of self-similar models with three different fractal dimensions. .......................................................................................................... 25 Figure 9. Variations in recovery factor with fracture spacing for example models incorporating planar fractures with uniform flow properties and fractal distributions of flow properties among the producing fractures. ...................................................................................................................................... 26 Figure 10. Schematic of the Monte Carlo uncertainty analysis applied in the calculation of reservoir thermal energy, wellhead thermal energy, and electric power generation potential for liquid-dominated geothermal systems........................................................................................................... 27 iii

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