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Figure 2.2 All BHT sites in the conterminous United States in the AAPG database. BHT symbols are based on depth and temperature (heat flow is not available for all of the sites, so some were not used for preparation of the Geothermal Map of North America). The named wells are the calibration points. The regional heat flow and geothermal database sites are also shown. 2.2.1 Heat flow Before calculation of the heatflow grid values, individual data points were ranked for quality, based on the uncertainty of the data points (see Blackwell et al., 1991, for a discussion of quality ranking). Hydrothermal systeminfluenced data (very high values, i.e., generally greater than 120 mW/m2) were excluded from the contouring. All of the heatflow values obtained from the regional data sets were then merged and contoured using a gridding interval of 5’ (0.08333°) of latitude/longitude (about 8 km point spacing) with a minimum curvature algorithm. The resulting heatflow grid (see Figure 2.1) is the starting point for all of the calculations described in this chapter. Figure 2.2 illustrates that, at the present stage of the analysis, there are still large geographic areas that are undersampled with respect to the 8 km grid interval, such that the contours are not well constrained in places where the data are sparse. For example, Kentucky and Wisconsin have no conventional heatflow data at all (although there are some BHT data points), and there are large gaps in several other areas, especially the eastern part of the United States. Areas in the Appalachian basin may have low thermal conductivity and high heat flow (as is the case in northwestern Pennsylvania), but data are limited in this region. Heat flow for AAPG database BHT points in the eastern United States was not calculated, due to the small and generally scattered nature of the drilling there and limited thermal conductivity information. The deeper wells were used in the preparation of the temperature maps, however. Chapter 2 10°C – 50°C 50°C – 75°C 75°C – 150°C 150°C – 265°C Geothermal ResourceBase Assessment 27 AAPG 1972 BHT Well Temps. Heat Flow Database Geothermal Database Equilibrium LogsPDF Image | Geothermal Resource Base Assessment
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