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this, the correction begins to decrease rather the increase. Therefore deeper than 12,900 feet the BHT data were given a linear increase starting with the maximum value of the SMU-Harrison correction (34.3°F) and increasing slightly by 0.05°F every 500 feet. The deeper wells are expected to have longer times between drilling circulation and BHT measurements and as a result the correction does not increase at the same rate as the shallower depths. In order to assess the validity of the calculated in-situ temperature, the new values were checked against wells logged by the SMU Geothermal Laboratory in Texas. The well locations (Republic, Chapman, Lackland, Garcia, and West Ranch) were chosen because of their previously logged equilibrium temperatures using high-accuracy temperature logging gear (Figures 8 and 9; Wisian et al., 1996 and 1998; Blackwell and Richards, 2004b; and Negraru et al., 2008). An additional temperature log from the Pleasant Bayou well (DOE #2) was used. It was logged in 1988 by Panex after updates of the surface equipment (Randolph et al., 1992). The difference between the well log header BHT values, the Harrison corrected temperature values, and the equilibrium well measured temperature - depth curves is shown in Figures 9 a - f. The area data are determined according to their location being within ±0.5° of latitude and longitude (~50 mile radius) around the primary equilibrium well location. By limiting the radius distance from the equilibrium well, it reduces the impact of changes in geologic formations. The equilibrium temperature graphs show that the well log header BHTs are generally too cold in comparison to the corrected in-situ temperature. By applying the SMU-Harrison correction, the data fall more tightly around the logged equilibrium line. The West Ranch well (Figure 9e) has the least correlation to the corrected data. This limited correlation could be due to the influence of shallow water sources for waterflooding of the West Ranch field to push the oil out of the deeper formations. The West Ranch well was measured by the SMU Geothermal Laboratory in 1983. The Lackland well (Figure 9c) is much shallower than the area values and is therefore difficult to compare with area values. 21PDF Image | Texas Geothermal Assessment for the I35 Corridor East
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