Geothermal Resource­ Base Assessment

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

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2­36 Chapter 2 Geothermal Resource­Base Assessment Table 2.5 Summary of nonhydrothermal U.S. geothermal resource­base estimates. Source and Category Thermal Energy, Volume of Total Gas + and Alaska Alaska – 26 systems 9,000 (low) Hawaii – 2 systems 1,535 MW ­ Alaska – all EGS 3,200,000 ­ Hawaii N/A 18 in 10 J = EJ Methane, Thermal Energy, Geopressured (Papadopulos et al.,1975). 46,000 23,700 71,000 Geopressured (Wallace et al.,1979). 110,000 59,000 170,000 Coproduced Resources 0.0944 – 0.451 favorable than implied by the map contours. In the western United States, where the resource is almost ubiquitous, the local variations may not be as significant. In the central and eastern United States, however, there will be areas of moderate to small size that are much higher grade than the maps in Figure 2.7 imply; these areas would obviously be the initial targets of development. EGS ­ Sedimentary EGS (lower 48 states) 100,000 ­ Basement EGS (lower 48 states) 13,300,000 ­ Volcanic EGS Excluding Yellowstone 65,000 (high) (depends on water temperature) The highest temperature regions represent areas of favorable configurations of high heat flow, low thermal conductivity, plus favorable local situations. For example, there are lateral variations of almost 100% in the mean thermal conductivity within the sedimentary section. In addition, there are high heat flow areas in the eastern United States, due to the high crustal radioactivity, such as the White Mountains in New Hampshire (Birch et al., 1968) and northern Illinois (Roy et al., 1989). The most favorable resource areas in the eastern United States will have high crustal radioactivity, low average thermal conductivity, and other favorable circumstances (such as aquifer effects). Detailed exploration studies are necessary to identify the highest temperature locations, because the data density is lowest in the eastern United States, where smaller targets require a higher density of data points. 12 18 x 10 SCF* in 10 J = EJ * SCF = standard cubic feet of methane (ideal gas conditions) at 1 atm, 60°F.

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