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A comparison of the SMU-Harrison equation and the Kehle equation shows the largest difference at shallow depths, i.e., 4.5 °F at 6,000 feet, with the SMU-Harrison correction the lesser of the two. At depths of 12,000 feet or greater, the corrections are the same. The SMU-Harrison equation is used to correct BHTs between the depths of 3,000 and 12,900 feet. 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. As a result, the correction is assumed to not increase at the same rate as the shallower depths. In order to assess the validity of the calculated in-situ temperature, the values were checked against wells in Texas logged by the SMU Geothermal Laboratory. The well locations (Republic, Chapman, Garcia, and West Ranch) were chosen because of their equilibrium temperatures logs made with high-accuracy, high precision temperature logging equipment (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. That well was logged in 1988 by Panex (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 BHT data were selected within ±0.5° of latitude and longitude (~30 mile radius) around the equilibrium well location. By limiting the distance from the equilibrium well, the data are assumed to be most comparable. The equilibrium temperature graphs show that the well log header BHTs are generally too cold in comparison to the in-situ temperature. After applying the SMU-Harrison correction, the data fall more tightly around the logged equilibrium temperature line. The West Ranch well (Figure 9d) has the poorest 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. 21PDF Image | Texas Geothermal Assessment for the I35 Corridor
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