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HomeMy WebLinkAboutGeothermal Resource Council Pilgrim Hot Springs Nome Alaska An Update - Oct 2012Pilgrim Hot Springs: An Updatep 36th GRC Annual Meetingg Reno, NV 10/02/2012 OVERVIEW: -Geologic Setting Gbtt-Geoprobe temperatures -Well Data -Locations-Locations -Temperatures -Natural Gamma, Conductivity,,y, Resistivity Logs -Cuttings Logs -Preliminary MT data -Geologic cross-section Geologic Setting PHS USGS Geologic Map of Seward Peninsula Drillingg Temperature map of Temperature map of geothermal aquifer from Geoprobe holes (60-130 feet geothermal aquifer from Geoprobe holes (60-130 feetholes (60 130 feet depth) holes (60 130 feet depth) Fig. by Ronald Daanen SS--11 SS--99 PSPS--1212--11 PSPS--1212--22PSPS--1212--33 2012 wells (996 – 1296 ft)2012 wells (996 – 1296 ft) 2011 wells (500ft) Existing wells (80-900 ft) 2011 wells (500ft) Existing wells (80-900 ft)200 meters Pilgrim Hot Springs Static Temperature Logs Temperature (F) 0 100 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 S1 S9 PS-12-1100 200 300 400 h (feet)PS 12 1 PS-12-2 PS-1 500 600 700 800Dept PS-2 PS-3 PS-4 800 900 1000 1100 PS-5 MI-1 Basement 1200 1300 Basement contact PS-12-3 Fig. from William Cumming Fig. from William Cumming Fig. from William Cumming Fig. from William Cumming Fig. from William Cumming SS--11Cross-section Line NE SS--99 PSPS--1212--11 PSPS--1212--22PSPS--1212--33 2012 wells (996 – 1296 ft)2012 wells (996 – 1296 ft) 2011 wells (500ft) Existing wells (80-900 ft) 2011 wells (500ft) Existing wells (80-900 ft)200 meters PSPS--55 SW In Progress… Processing the lithologic data for model development-Processing the lithologic data for model development -Correlating lithologic, well logs -Overlay final results from MT survey -Target date is mid-NovemberTarget date is mid November -Next step is reservoir stimulation model -Sample analysis -Bedrock, clays, indurated sediments -XRD, XRF, Spectrometry Early conclusions: -Indurated zones indicate past geothermal fluid pathways and occur in hottest temperature zone -Major clay layers correlate with high conductivity in the MT cross-section -Thinner, yet laterallyextensiveclay layersdirect outflow andcontrol reversalse , yet ate a y e te s e c ay aye s d ect out o a d co t o e e sa s in temperature curves -Tightly-spaced anomalous indurated zones, high conductivity, and high temperatures (both well and Geoprobe holes)temperatures (both well and Geoprobe holes) -proximity to upflow? Additi l SlidAdditional Slides Isostatic Gravity Processed by Jonathan Glen USGS Menlo Park Differential resistivity @ 5m depthDifferential resistivity @ 5m depth stivitystivityctivityctivityHigh resisHigh resisLow conducLow conducsistivitysistivityonductivityonductivityLow resLow resHigh coHigh coData processed by Darcy McPhee, USGS Menlo Park Differential resistivity @ 15m depthDifferential resistivity @ 15m depth stivitystivityctivityctivityHigh resisHigh resisLow conducLow conducsistivitysistivityonductivityonductivityLow resLow resHigh coHigh coData processed by Darcy McPhee, USGS Menlo Park Differential resistivity @ 40m depthDifferential resistivity @ 40m depth stivitystivityctivityctivityHigh resisHigh resisLow conducLow conducsistivitysistivityonductivityonductivityLow resLow resHigh coHigh coData processed by Darcy McPhee, USGS Menlo Park Differential resistivity @ 60m depthDifferential resistivity @ 60m depth stivitystivityctivityctivityHigh resisHigh resisLow conducLow conducsistivitysistivityonductivityonductivityLow resLow resHigh coHigh coData processed by Darcy McPhee, USGS Menlo Park Differential resistivity @ 80m depthDifferential resistivity @ 80m depth Data processed by Darcy McPhee, USGS Menlo Park stivitystivityctivityctivityDifferential resistivity @ 100m depthDifferential resistivity @ 100m depth High resisHigh resisLow conducLow conducsistivitysistivityonductivityonductivityLow resLow resHigh coHigh coData processed by Darcy McPhee, USGS Menlo Park Magnetic field anomaly map Magnetic field anomaly map Data processed by Jonathan Glen, USGS Menlo Park