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Stanley Geothermal Feasibility Study

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Stanley Geothermal Feasibility Study ( stanley-geothermal-feasibility-study )

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above 50°C are viable for space heating and even lower temperatures are acceptable for aquaculture (Geo-Heat Center, 2012). Based on intended use and the goal to achieve the highest potential temperature and flow, two potential drilling locations are proposed. Site A is the preferred location for drilling of an exploration well along the fault intersection trace used by Autenreith (ISU, written communication, 2011) to develop the conceptual structural model and is in an area acceptable for drilling. If the faults dip at 55°, then Site A has a predicted depth to fault intersection of 481 meters. This depth would place it below the active surface ground water system, minimizing mixing and cooling of the resource. Depending on the dip of the faults in this area the depth of the targeted fault intersection could range from 389 meters to 662 meters. The coordinates for Site A are 665291, 4898891 (UTM Zone 11N). Site B is located north of Site A near the Cemetery access road. This location has the advantage of being located closer to the road thereby requiring less road construction for a drilling pad. The predicted depth to the fault intersection (with a 55° dip) at this location is estimated to be 545 meters but could range from 442 meters to 750 meters. The coordinates for Site B are 665289, 4898955 (UTM Zone 11N). By drilling small diameter exploration holes, referred to as slim holes, several important characteristics can be identified, such as: a stratigraphic section; reservoir characteristics (i.e. permeability and porosity); thermal gradients; chemistry of the fluids; and potential flow rates. Another option for a test well would be to drill a larger diameter, deeper gradient hole. If adequate temperatures and flows were encountered this gradient hole could be developed and used as the production well of geothermal water for the City of Stanley. The resource within the Stanley area may be suitable for different uses depending on the results from a successful test well. It would be suitable for space heating either through individual buildings in the shallower thermal systems or a district heating system in the deeper higher temperature portions of the reservoir. The hot water could also be used for greenhouse operations and recreational purposes. At the high end of the potential range of estimated temperatures and flow possibilities, it may also be suitable for power generation. Several companies have developed low temperature binary cycle, power generation units in modular form which can range from a few 10’s of KWe to 100’s of KWe. The low annual temperature in the Stanley area would be ideal for the cooling cycle resulting in efficient operation of such a unit. 8

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