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Appendix A Summary of Major Geopressure - Geothermal Reports The following section is a brief description of the major geothermal - geopressure reports based on the research completed during the 1970s to 1990s. The reports are listed in alphabetical order by the last name of the first author. Bebout et al., 1982: This report did regional studies of the lower Eocene Wilcox Group in Texas to assess the potential for producing heat energy and solution methane from geopressured fluids in the deep-subsurface growth-faulted zone. However, in addition to assembling the necessary data for the geopressured geothermal project, this study has provided regional information of significance to exploration for other resources such as lignite, uranium, oil, and gas. Because the focus of this study was on the geopressured section, emphasis was placed on correlating and mapping those sandstones and shales occurring deeper than about 10,000 ft. The Wilcox and Midway Groups comprise the oldest thick sandstone/shale sequence of the Tertiary of the Gulf Coast. The Wilcox crops out in a band 10 to 20 miles wide located 100 to 200 miles inland from the present-day coastline. The Wilcox sandstones and shales in the outcrop and updip shallow subsurface were deposited primarily in fluvial environments; versus the downdip environment in the deep subsurface, the Wilcox sediments there were deposited in large deltaic systems, some of which were reworked into barrier-bar and strandplain systems. Growth faults developed within the deltaic systems, where they prograded basinward beyond the older, stable Lower Cretaceous shelf margin onto the less stable basinal muds. Continued displacement along these faults during burial resulted in: (1) entrapment of pore fluids within isolated sandstone and shale sequences, and (2) buildup of pore pressure greater than hydrostatic pressure and development of geopressure. Bebout et al., 1983: From this research detailed geological, geophysical, and engineering studies conducted on the Frio Formation have delineated a geothermal test well site in the Austin Bayou Prospect which extends over an area of 60 square miles. A total of 800 to 900 feet of sandstone occurs between the depths of 13,500 and 16,500 feet. At least 30 percent of the sand has core permeabilities of 20 to 60 millidarcys. Temperatures at the top of the sandstone section are 300°F. 66PDF Image | Texas Geothermal Assessment for the I35 Corridor East
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