TY - GEN
T1 - Geothermal play fairway analysis, Phase 3
T2 - Geothermal Resources Council 2018 Annual Meeting: Geothermal's Role in Today's Energy Market, GRC 2018
AU - Shervais, John W.
AU - Glen, Jonathan M.
AU - Siler, Drew
AU - Liberty, Lee M.
AU - Nielson, Dennis L.
AU - Garg, Sabodh
AU - Dobson, Patrick
AU - Gasperikova, Erika
AU - Sonnenthal, Eric
AU - Newell, Dennis L.
AU - Neupane, Ghanashyam
AU - DeAngelo, Jacob
AU - Ritzinger, Brent
AU - Peacock, Jared
AU - Snyder, Neil
AU - Mink, Leland L.
N1 - Publisher Copyright:
© 2018 International Journal of Caring Sciences. All rights reserved.
PY - 2018
Y1 - 2018
N2 - The Snake River Plain (SRP) Geothermal Play Fairway Analysis team identified two regions of interest during Phase 2 studies: the western SRP near Mountain Home, Idaho and Camas Prairie, Idaho. New geological, geochemical, and geophysical (gravity, magnetic, MT, seismic) studies of both areas led to a focus on Camas Prairie for validation during Phase 3. Camas Prairie is an EW-trending half-graben bounded on the north by the Idaho Batholith and on the south by the Mount Bennett Hills. Camas Prairie is bisected by a major NW-trending fault system (The Pothole fault) that separates NW-trending faults to east from ENE-trending faults to the west. The Camas Prairie geothermal system is indicated by warm springs and wells, geophysical evidence of buried faults and basins, mapped faults, elevated 3 He/ 4 He ratios, moderate calculated reservoir temperatures, and the occurrence of young basalt vents and lava flows along the range front. High permeability is suggested by the confluence of intersecting faults, including the range front system and the Pothole fault system, the presence of springs along mapped structural features, and dilational stress along major NW-trending fault systems. Basaltic vents as young as 692 ka along the range front are offset by late Pleistocene faults, indicating relatively recent magmatic flux and tectonic activity. Prolonged heat flux is inferred to result from mid- to shallow crustal sills, similar to those observed farther south. Magnetotelluric studies suggest the presence of a clay seal over the prospective target area that may result in part from hydrothermal alteration. Our model is similar to that proposed for the western SRP but is less energetic due to the smaller volume of magma inferred. It is also similar to Basin-and-Range geothermal systems, but differs by including a distinct magmatic heat component.
AB - The Snake River Plain (SRP) Geothermal Play Fairway Analysis team identified two regions of interest during Phase 2 studies: the western SRP near Mountain Home, Idaho and Camas Prairie, Idaho. New geological, geochemical, and geophysical (gravity, magnetic, MT, seismic) studies of both areas led to a focus on Camas Prairie for validation during Phase 3. Camas Prairie is an EW-trending half-graben bounded on the north by the Idaho Batholith and on the south by the Mount Bennett Hills. Camas Prairie is bisected by a major NW-trending fault system (The Pothole fault) that separates NW-trending faults to east from ENE-trending faults to the west. The Camas Prairie geothermal system is indicated by warm springs and wells, geophysical evidence of buried faults and basins, mapped faults, elevated 3 He/ 4 He ratios, moderate calculated reservoir temperatures, and the occurrence of young basalt vents and lava flows along the range front. High permeability is suggested by the confluence of intersecting faults, including the range front system and the Pothole fault system, the presence of springs along mapped structural features, and dilational stress along major NW-trending fault systems. Basaltic vents as young as 692 ka along the range front are offset by late Pleistocene faults, indicating relatively recent magmatic flux and tectonic activity. Prolonged heat flux is inferred to result from mid- to shallow crustal sills, similar to those observed farther south. Magnetotelluric studies suggest the presence of a clay seal over the prospective target area that may result in part from hydrothermal alteration. Our model is similar to that proposed for the western SRP but is less energetic due to the smaller volume of magma inferred. It is also similar to Basin-and-Range geothermal systems, but differs by including a distinct magmatic heat component.
KW - Basaltic heat source
KW - Camas Prairie
KW - Conceptual model
KW - Snake River Plain
UR - http://www.scopus.com/inward/record.url?scp=85059908933&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85059908933
T3 - Transactions - Geothermal Resources Council
SP - 553
EP - 563
BT - Geothermal's Role in Today's Energy Market - Geothermal Resources Council 2018 Annual Meeting, GRC 2018
Y2 - 14 October 2018 through 17 October 2018
ER -