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Chapter 2 Geothermal ResourceBase Assessment Figure 2.3 Flow chart for calculation of temperature and heat content at depth. Note: 1 kWsec = 1 kJ and angle brackets denote depthaveraging. Use of the extensive BHT data set is a new feature of the heatflow map and this temperatureatdepth analysis used in previous studies. The BHT data were calibrated by comparison to a series of precision temperature measurements made in hydrocarbon wells in thermal equilibrium, and a BHT error was thus established (Blackwell and Richards, 2004b; Blackwell et al., 1999). Data up to a maximum depth of 3,000 m were used (4,000 m in southern Louisiana). The basic correction was similar to the AAPG BHT correction, with modifications as proposed by Harrison et al. (1983). A secondary correction that is a function of the gradient was applied, so that a bias associated with average geothermal gradient in the well was removed. This correction was checked against the approximately 30 sites in the United States with accurate thermal logs (Figure 2.2). We contend the correction for the average gradient of a group of wells is accurate to about ± 10°C at 200°C, based on the direct comparisons described by Blackwell and Richards (2004b). With the inclusion of the BHT data, there is a higher confidence level in the interpreted temperatures at depth. For geothermal resource potential purposes, the corrected BHT data can be used directly in 29PDF Image | Geothermal Resource Base Assessment
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