Geothermal Resource­ Base Assessment

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Geothermal Resource­ Base Assessment ( geothermal-resource­-base-assessment )

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Chapter 2 Geothermal Resource­Base Assessment kg/m3 and 1,000 J/kg°C, for the density (Ú) and heat capacity (Cp) of the rock, respectively. If this mass of rock is cooled through a temperature difference of 200°C to a final temperature of 50°C, then the heat removed is given by This quantity of thermal energy, which could potentially be released from a 200 km2 area of rock, is equivalent to the total amount of energy consumed annually in the United States, which has a total land area close to 10 million km2. This illustration demonstrates the substantial size of the U.S. geothermal resource. Of course, the size of the accessible resource is much smaller than implied by this simplistic analysis. Details relating to the development scenarios are described elsewhere in this report, including Chapter 3. The validity of the calculations of temperature at depth is important. In the areas of hydrocarbon development, there are wells that have been drilled to 3 to 6 km (10,000 to 19,000 ft) depths, so that the predicted temperatures can be checked against measurements in deep wells. In the case of the areas represented in the AAPG BHT database, this has been done and the agreement is within ± 20°C in the 3 to 6 km depth range. In the areas of geothermal drilling, there is some information outside of the immediate influence of geothermal systems, and there are a few research wells that serve as data points at depth. This information has been compared to the calculated values with similar results to the BHT comparison. 2­15 Figure 2.7a Average temperature at 3.5 km. 3.5 km 50°C 100°C 150°C 200°C 250°C 300°C

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