Texas Geothermal Assessment for the I35 Corridor

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Texas Geothermal Assessment for the I35 Corridor ( texas-geothermal-assessment-i35-corridor )

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ANALYSIS OF THE DATA The data from the SMU-TX RRC database, the AAPG Geothermal Well Survey (AAPG, 1994), Gulf Coast Geopressure database (Gregory et al., 1980), Freestone County (Burns, 2004), and Fairway Field (Hunt Oil Company and Kweik, this report) were used to generate a series of temperature maps of the area of the study at various depths and at different scales. The maps were produced using software which developed a 3-dimensional lattice and second program for 2-dimensional grids. The 3-dimensional lattice is able to take into consideration the gradients of data in all directions to create smooth contour maps of temperatures at specific depths. These maps represent the general trend of the data and regional temperatures. Depths are slices of the lattice for a specific interval (Figure 13 a to h) shown at 1,000 feet intervals between the depths of 7,000 to 14,000 feet. The highest values are in the South Texas Wilcox formation zone (Counties: Zapata, Jim Hoggs, Webb, Duval, Live Oak, McMullen, etc.). The coldest area in this assessment was in the North Central portion of the state with Cooke and Grayson Counties having the lowest temperatures. The reason for this area being colder than other parts of eastern Texas is related to the basement rocks associated with the Wichita Mountains and the rift zone associated with them (Muehlberger et al., 1967). Next the data were used to generate a 2-dimensonal set of maps at 9,000 and 12,000 feet focused on the county level (Figure 14 a - b). Wells with depth values of ± 2,000 feet from the mapped depth were selected. The well gradient was used with the corrected temperature to interpolate to specific depths of 9,000 and/or 12,000 feet and then contoured to create temperature maps. The well locations are plotted showing where data were used for generating the maps to assist viewers in determining the accuracy of map values and data variability. At this level of detail, the individual counties can be viewed with the location of data points clearly shown. Although there are areas containing counties with little to no data, it is helpful to see where the county sits within the larger temperature trends for the region. Most of the wells are relatively densely located, with the average distance between wells approximately 3.6 miles. From this the map contours are based on a grid spacing of 13 square miles. The depths of 9,000 and 12,000 feet were chosen for the 2-dimensional detailed maps because 9,000 feet is the initial depth where most of Eastern Texas is near 200°F. This is the initial temperature needed in Texas, with the current binary turbine technology requirements. Temperatures at 12,000 feet were chosen because in this area the majority of “deep” oil and gas 28

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