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Chapter5 SubsurfaceSystemDesignIssuesandApproaches Table 5.1 Example of site-fracturing information. Depth to 250°C, km Completion temperature, °C Depth to top of granite, km Completion depth, km Stress type E. Texas Basin 5.75 200 5 5 Tension Soft grading to harder cements Nampa 43 5.5 265 4.5 5 Tension Granite Basalt to about 1.5km Sisters Area 50 4.6 250 3.5 5 Tension Tuffs, andesite/ basaltic lavas, andesite Poplar Dome 37 6.5 135 4 2.2 Strike slip Madison limestone Sandstone/ limestone/ shale Clear Lake 76 3 415 3 6 Tension Conway Granite Average temperature gradient to 250°C , °C/km 40 24 10 200 0 7 Strike slip Completion formation (bedrock) Sandstone, silicified Granite Granite Rhyolite/ hydro- thermally altered meta- sediments Granite None 5-16 Overlying formations The sites with crystalline basement will be similar to many of the EGS sites studied so far for research purposes. All of these sites have significant stress histories that should have produced pre-existing fractures. The two sites in sedimentary basins are routinely fractured for oil and gas production and resemble the situation at Horstberg. Water is available from oil and gas production for fracturing and for circulation makeup. Water costs for the other sites assumed purchase from the local water utility, although the New Hampshire site is very close to a river, and there should be ample water available in the long term for cooling and makeup, as well as fracturing, because the run of the river water law is followed in the east.PDF Image | The Future of Geothermal Energy
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