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The other existing datasets used [AAPG Geothermal Survey Well Data, Gulf Coast Geopressure, and Freestone County Wells] were already reviewed for errors by their respective authors. Next, the SMU-TX RRC data were combined with the other data sets and compared within a 1° by 1° area for similar temperatures and depths between the different data sets. Wells with temperatures greater than the local standard deviation (±27°F) were removed as outliers and noted in the database. Temperature Correction There are various types of temperature corrections that can be applied to the BHT value to calculate the approximate in-situ temperature. This is usually done based on the time since circulation recorded with the BHT reading, or derived from an empirical correction for the depth of the measurement. The Gregory et al. (1980) report states the Harrison correction was applied to the temperature values to represent in-situ values. This is the same correction used previously by Blackwell and Richards (2004a) on the Geothermal Map of North America, and Harrison et al. (1983) for oil and gas wells in Oklahoma. This is similar to the correction used by Kehle et al., (1970) for the Geothermal Gradient Map of North America (Equation 1). The correction used by SMU Geothermal Laboratory is based on the Harrison correction, which is a second order polynomial that correlates the BHT measurement to depth (Equation 2). It was applied to the SMU-TX RRC data, AAPG Geothermal Survey Well data, Freestone County Well data, and Fairway Field data using SMU-Harrison Equation 1. This correction value is then added to the well log header BHT measurement to calculate an approximate in-situ temperature. Kehle Correction Equation 1. °F = -8.819 x 10-12 z3 - 2.143 x 10-8 z2 + 4.375 x 10-3 z -1.018 where z = depth in feet. (Gregory et al., 1980, p. 59). SMU-Harrison Equation 2. °C = -16.51213476+0.01826842109 z - 0.000002344936959 z2 where z = depth in meters. 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 effectively corrects BHTs between the depths of 3,000 and 12,900 feet. Deeper than 20PDF Image | Texas Geothermal Assessment for the I35 Corridor East
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