Hawthorne Nevada Deep Direct-Use Feasibility Study - Data Used for Geothermal Resource Conceptual Modeling and Power Capacity Estimates Hawthorne_fracture_data_HWAAD-2A_HWAAD-3.xlsx

Thursday, May 7, 2020 4:35 pm

This data submission includes several data components that were used to develop a conceptual model and power capacity-estimates of two low-temperature geothermal resources that define geothermal prospect A at Hawthorne, Nevada. Data are sourced from a combination of legacy publicly-available data and more recent data acquisition conducted by the US Navy Geothermal Program Office (2008-2013) and the Great Basin Center for Geothermal Energy at the University of Nevada, Reno (2008-2010). Data sets include compiled fluid geochemistry data, down-hole temperature logs for wells in the vicinity of prospect A, 2 meter temperature survey data, temperature-spinner logs acquired in well HWAAD-2A, fracture picks from image log data acquired in wells HWAAD-2 and HWAAD-3, and XRD analyses on cuttings from wells HWAAD-2A and HWAAD-3. These data have been reviewed for errors and inconsistencies, but it is not guaranteed that some errors could still remain. The resource conceptual model and power capacity estimates are included in the final report to the US Department of Energy, and are presented in a manuscript by Ayling and Hinz (accepted: Geothermics). A link to the manuscript will be added to this dataset when published. Kelly Blake from the US Navy Geothermal Program Office conducted the fracture analysis. Results and methods are reported in Blake, K. (2011), HWAAD-2A and HWAAD-3: Fracture and Stress Analysis, Hawthorne Army Deport, Hawthorne, NV Initial Assessment. Internal Navy Geothermal Program Office Technical Report, 8p. WellCAD was used to analyze the HWAAD-2A and HWAAD-3 ABI43 image logs acquired in 2009 by Southwest Exploration Services LLC. Two lengths of borehole were imaged in HWAAD-2A: 495'-1500' (151-457 m) (top section) and 1500'-4722' ( 457-1439 m) (bottom section). One length of borehole was imaged in HWAAD-3, between ~1500 ft and 4000 ft (457-1219 meters). WellCAD was used to identify natural fractures and borehole induced structures. These fracture and structure picks were then transferred to a text file and analyzed in Matlab. The Matlab analysis provided the average fracture orientation and average principal stress orientations. Natural fractures and borehole induced structures were both identified in the image log. Only tensile fractures and petal-centerline fractures were identified, no breakouts.