Preliminary Geothermal Favorability Map of the Great Basin

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Originator: Mark Coolbaugh

Originator: Richard Zehner

Originator: Corne Kreemer

Originator: David Blackwell

Originator: Gary Oppliger

Originator: Don Sawatzky

Originator: Geoff Blewitt

Originator: Aasha Pancha

Originator: Maria Richards

Originator: Catie Helm-Clark

Originator: Lisa Shevenell

Originator: Gary Raines

Originator: Gary Johnson

Originator: Tim Minor

Originator: Tonya Boyd

Publication_Date: 20050505

Title: Preliminary Geothermal Favorability Map of the Great Basin

Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: University of Nevada, Reno

Publisher: Nevada Bureau of Mines and Geology

Other_Citation_Details:

REFERENCES: Blackett, R.E. and Wakefield, S.I., 2002, Geothermal resources of Utah, a digital atlas of Utah's geothermal resources: Utah Geological Survey Open-File Report 397, D-ROM. Blackwell, D.D. and Richards, M., 2004, Geothermal Map of North America, AAPG, map item number 423, scale 1:6,500,000. Coolbaugh, M.F. and Shevenell, L.A., 2004, A method for estimating undiscovered geothermal resources in Nevada and the Great Basin: Geothermal Resources Council Transactions, v. 28, p. 13-18. Higgins, C.T. and Martin, R.C., 1980, Geothermal resources of California: California Geologic Data Map Series Map No. 4 Mariner, R.H., Presser, T.S., and Evans, W.C., 1983, Geochemistry of active geothermal systems in the northern Basin and Range province: Geothermal Resources Council, Special Report No. 13, p. 95-119. Mitchell, J.C., Johnson, L.L., and Anderson, J.E., 1980, Geothermal investigations in Idaho, Part 9, Potential for direct heat application of geothermal resources: Idaho Department of Water Resources Water Information Bulletin No. 30. Peterson, N.V., Priest, G.R., Black, G.L., Brown, D.E., and Woller, N.M., 1982, Geothermal resources of Oregon: Oregon Department of Geology and Mineral Industries. Prudic, D.E., Harrill, J.R., and Burbey, T.J., 1995, Conceptual evaluation of regional groundwater flow in the carbonate-rock province of the Great Basin, Nevada, Utah, and adjacent states: U.S. Geological Survey Professional Paper 1409-D, 102 pp. Raines, G.L., Sawatzky, D.L., and Connor, K.A., Great Basin Geoscience Data Base: USGS Digital Data Series DDS-041. Shevenell, L., Garside, L.J. and Hess, R.H., 2000, Nevada Geothermal Resources: Nevada Bureau of Mines and Geology, Map 126. Trexler, D. T., Flynn, T., Koenig, B. A., and Ghusn, G. Jr., 1983, Geothermal resources of Nevada: Map produced by the National Geophysical Data Center, National Oceanic and Atmospheric Administration for the Geothermal and Hydropower Technologies Division, U.S. Department of Energy, 1 map. Witcher, J.C., Stone, C., and Hahman, W.R., 1982, Geothermal Resources of Arizona: Arizona Bureau of Geology and Mineral Technology, University of Arizona, Tucson, AZ.

Online_Linkage:

\\palido.unr.edu\geothermal\_projects\metadata_updates\_auth\tdozet\09_Favorabilities_both\final\09_Geothermal_Favorability_Layer_Data\GeothermalFavorability2005\GeothermalFavorability2005\geofav05

Description:

Abstract:

This ESRI real number GRID provides information for assessing regional geothermal potential in the Great Basin. The values provide a ranking of favorability for high-temperature (> 150°C) extensional- type geothermal systems. The favorability calculation is based on a logistic regression posterior probability statistic, with the GRID value being proportional to the log-transformed (posterior logit) logistic regression posterior probability. A total of 51 geothermal systems were used as training sites for weights-of-evidence and logistic regression spatial statistics. These 51 geothermal systems are either producing electrical power today or have geothermometer temperatures ? 150°C.

Purpose:

This ESRI floating point GRID was developed for a weights of evidence/logistic regression analysis of geothermal potential of the Great Basin (Coolbaugh and others, 2005).

Supplemental_Information:

Potential Influence of Aquifers: Most known high-temperature geothermal systems in the Great Basin (? 150°C) occur outside regional groundwater aquifers (Fig. 1), including the Snake River Plain and Northwest Basalt aquifers in the northern Great Basin (USGS Principal Aquifers of the US HTTP://nationalatlas.gov/aquifersm.html) and the carbonate aquifer in eastern Nevada and western Utah (Prudic et al., 1995). It is hypothesized that lateral groundwater flow could be capturing and entraining rising thermal fluids in these aquifers, and suppressing the formation of hot springs, thereby rendering those areas less completely explored for geothermal systems than elsewhere in the Great Basin. In order to minimize a potential bias with regard to aquifers in the favorability model, the geological and geophysical maps used as evidence were selected for their ability to model the geothermal potential independent of the presence of those aquifers (at least at economic depths). As a first step, weights-of-evidence and logistic regression model weights for each evidence map were calculated for the non-aquifer areas (Figure 1). Those weights were then used to extrapolate geothermal favorability beneath areas having overlying regional aquifers. The logistic regression model accurately predicted 33 known geothermal training sites in non-aquifer regions, but predicted 24 training sites in the aquifer areas, whereas only 18 are known. This suggests that the regional aquifers may be under-explored relative to non-aquifer areas. It is important to note that this model is not designed to predict undiscovered geothermal systems. The model is meant to predict the relative geothermal favorability within the Great Basin, and significant numbers of undiscovered geothermal systems are likely to occur in both the aquifer and non-aquifer regions (Coolbaugh and Shevenell, 2004). MODEL LAYERS: Six geological/geophysical maps were combined into four evidence layers and were used to model geothermal favorability. A description of each of these four layers follows: 1) Combined Gravity/Topographic Gradient Map (Gary Oppliger; Arthur Brant Laboratory for Exploration Geophysics, University of Nevada, Reno): As a proxy for measuring the effective vertical displacement on late Tertiary and Quaternary faults in the Great Basin, a residual gravity map was combined with a topographic digital elevation model (DEM), and then the total surface slope (horizontal gradient) was calculated. The residual gravity map, a 20-km upward continued residual isostatic gravity anomaly Lisa: remove preceding phrase between the commas, was further reduced by removing bedrock-only regional gravity trends to produce a basins-only gravity anomaly map. This gravity map was converted to an approximate equivalent amount of subsurface basement relief using 60 meters/mgal (equivalent to a density contrast of 0.4 g/cm3), and then added to the 1-km DEM. The combined bedrock surface slope was then calculated by computing the total horizontal gradient for each 1-km cell. Lisa: site reference 2) Combined Global Positioning System (GPS) and Fault Dilation Map (Corné Kreemer, Geoff Blewitt; Nevada Geodetic Laboratory): Crustal dilation rates derived from GPS velocity measurements (interseismic strain) were added to dilation rates calculated from Quaternary fault slip rate data (long-term seismic strain) to produce a more geographically complete estimate of crustal dilation in the Great Basin. The geodetic strain rates were based on 476 GPS velocity measurements located throughout and just outside the Great Basin. These velocities were compiled from multiple networks, including the BARGEN continuous network, multiple USGS campaign networks, and several other groups. Velocities affected by known magmatic/volcanic activity were excluded. A Quaternary faults database, obtained from the USGS Quaternary Fault and Fold Database HTTP://gldims.cr.usgs.gov/qfault/viewer.htm) was updated with more recent slip rate estimates compiled in 1996 and 2002 HTTP://eqhazmaps.usgs.gov/html/faults2002.html). Slip rate parameters were converted to long-term strain rate tensors, from which dilation was calculated for every 20 km square grid cell in the Great Basin. 3) Temperature Gradient Map (David Blackwell, Maria Richards; Southern Methodist University (SMU) Geothermal Laboratory): A shallow crustal (0-1 km) temperature gradient map was generated using the SMU geothermal well database, which includes wells compiled by SMU (<http://www.smu.edu/geothermal/>), the USGS (Sass et al., 1999; <http://wrgis.wr.usgs.gov/open-file/of99-425/webmaps/home.html>), and other sources. Temperature gradients were derived in a multi-step process beginning with calculation of heat flux at individual wells, interpolation of heat flux between wells to produce heat flux maps (e.g., Blackwell and Richards, 2004), and conversion of the heat flux map to a temperature gradient map using thermal conductivities assigned for grouped geological formations. Improvements in the spatial resolution of the gradient map in the Great Basin were obtained by assigning separate thermal conductivities to graben-filled Quaternary sediments, basement rocks in horst blocks, and regions of late Tertiary and Quaternary volcanic rocks. Purposely excluded from the calculations used to make this map were geothermal wells and other wells drilled in known geothermal areas, so that the predicted temperature gradients would be independent of the degree of geothermal exploration 4) Seismicity Map (Aasha Pancha; Nevada Seismological Laboratory): The seismicity map was generated by adding up all historical earthquake magnitudes within a 40 km radius of each grid cell in the model. The distance from the epicenter to the center of each cell was used to inversely weight individual earthquake magnitudes. To avoid a bias in the detection of earthquakes near seismograph stations, earthquakes were not included in the seismicity calculation unless they were strong enough to be detected anywhere in the Great Basin. Earthquakes with a magnitude of ³4.8 were considered strong enough to meet this criterion regardless of the year of occurrence, and Pancha et al. (in review) compiled these earthquakes from multiple catalogs. Due to improvements in the seismograph network that occurred around 1970, all earthquakes with a magnitude of 4.0 and greater that occurred during or after 1970 were considered detectable regardless of their epicenter location, and were added to this compilation. These lower-magnitude earthquakes came from two main catalog sources: the USGS National Earthquake Information Center and the Berkeley Advanced National Seismic System.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:

REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.

Currentness_Reference:

REQUIRED: The basis on which the time period of content information is determined.

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -121.762980

East_Bounding_Coordinate: -111.489634

North_Bounding_Coordinate: 44.311450

South_Bounding_Coordinate: 33.115972

Keywords:

Theme:

Theme_Keyword_Thesaurus:

REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.

Theme_Keyword: Dilational Strain

Theme_Keyword: Quaternary Faults

Theme_Keyword: GPS

Theme_Keyword: Geodesy

Theme_Keyword: Strain Tensors

Theme_Keyword: Weights of Evidence

Theme_Keyword: Logistic Regression

Theme_Keyword: Temperature Gradient

Theme_Keyword: Gravity Gradient

Place:

Place_Keyword: USA

Place_Keyword: Western United States

Place_Keyword: Great Basin

Place_Keyword: Nevada

Place_Keyword: California

Place_Keyword: Utah

Place_Keyword: Idaho

Place_Keyword: Arizona

Place_Keyword: Oregon

Place_Keyword: Wyoming

Access_Constraints:

Although these data have been processed successfully on the computer system at the Nevada Bureau of Mines and Geology, no warranty expressed or implied is made regarding the accuracy or utility of the data on any system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data be directly acquired from the Nevada Bureau of Mines and Geology. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with the data. The Nevada Bureau of Mines and Geology shall not be held liable for improper use of the data described and/or contained herein. By using this data you hereby agree to these conditions.

Use_Constraints:

Reference and acknowledge the Nevada Bureau of Mines and Geology or specific author in products derived from this map. Do not reproduce for commercial purposes. This data is not surveyed data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Nevada Bureau of Mines and Geology

Contact_Person: web/GIS/database person

Contact_Position: web/GIS/database person

Contact_Address:

Address_Type: mailing and physical address

Address: University of Nevada, Reno MS178

City: Reno

State_or_Province: NV

Postal_Code: 89557-0178

Country: USA

Contact_Voice_Telephone: 775-784-6691

Contact_Electronic_Mail_Address: nbmg@unr.edu

Hours_of_Service: 8:00 a.m. - 3:00 p.m. (PST)

Contact_Instructions: web/GIS/database person

Native_Data_Set_Environment:

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Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: See references for each evidence layer comprising this GRID

Logical_Consistency_Report: Unknown

Completeness_Report: Should be complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: unknown

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: unknown

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Title: Preliminary Geothermal Favorability Map of the Great Basin

Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: University of Nevada, Reno

Publisher: Nevada Bureau of Mines and Geology

Other_Citation_Details:

REFERENCES: Blackett, R.E. and Wakefield, S.I., 2002, Geothermal resources of Utah, a digital atlas of Utah's geothermal resources: Utah Geological Survey Open-File Report 397, D-ROM. Blackwell, D.D. and Richards, M., 2004, Geothermal Map of North America, AAPG, map item number 423, scale 1:6,500,000. Coolbaugh, M.F. and Shevenell, L.A., 2004, A method for estimating undiscovered geothermal resources in Nevada and the Great Basin: Geothermal Resources Council Transactions, v. 28, p. 13-18. Higgins, C.T. and Martin, R.C., 1980, Geothermal resources of California: California Geologic Data Map Series Map No. 4 Mariner, R.H., Presser, T.S., and Evans, W.C., 1983, Geochemistry of active geothermal systems in the northern Basin and Range province: Geothermal Resources Council, Special Report No. 13, p. 95-119. Mitchell, J.C., Johnson, L.L., and Anderson, J.E., 1980, Geothermal investigations in Idaho, Part 9, Potential for direct heat application of geothermal resources: Idaho Department of Water Resources Water Information Bulletin No. 30. Peterson, N.V., Priest, G.R., Black, G.L., Brown, D.E., and Woller, N.M., 1982, Geothermal resources of Oregon: Oregon Department of Geology and Mineral Industries. Prudic, D.E., Harrill, J.R., and Burbey, T.J., 1995, Conceptual evaluation of regional groundwater flow in the carbonate-rock province of the Great Basin, Nevada, Utah, and adjacent states: U.S. Geological Survey Professional Paper 1409-D, 102 pp. Raines, G.L., Sawatzky, D.L., and Connor, K.A., Great Basin Geoscience Data Base: USGS Digital Data Series DDS-041. Shevenell, L., Garside, L.J. and Hess, R.H., 2000, Nevada Geothermal Resources: Nevada Bureau of Mines and Geology, Map 126. Trexler, D. T., Flynn, T., Koenig, B. A., and Ghusn, G. Jr., 1983, Geothermal resources of Nevada: Map produced by the National Geophysical Data Center, National Oceanic and Atmospheric Administration for the Geothermal and Hydropower Technologies Division, U.S. Department of Energy, 1 map. Witcher, J.C., Stone, C., and Hahman, W.R., 1982, Geothermal Resources of Arizona: Arizona Bureau of Geology and Mineral Technology, University of Arizona, Tucson, AZ.

Process_Step:

Process_Description: See above and Coolbaugh and others (2005)

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Direct_Spatial_Reference_Method: Vector

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Entity_Type_Label: Preliminary Geothermal Favorability Map of the Great Basin

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Overview_Description:

Entity_and_Attribute_Overview:

This real number ESRI GRID file contains probability values measured in log probability.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Nevada Bureau of Mines and Geology

Contact_Person: web/GIS/database person

Contact_Position: web/GIS/database person

Contact_Address:

Address_Type: mailing and physical address

Address: University of Nevada, Reno MS178

City: Reno

State_or_Province: NV

Postal_Code: 89557-0178

Country: USA

Contact_Voice_Telephone: 775-784-6691

Contact_Electronic_Mail_Address: nbmg@unr.edu

Hours_of_Service: 8:00 a.m. - 3:00 p.m. (PST)

Contact_Instructions: web/GIS/database person

Resource_Description: Downloadable Data

Distribution_Liability:

Requestor hereby releases the Nevada Bureau of Mines and Geology, the University of Nevada, Reno, and their agents, consultants, contractors or employees from any and all claims, action, or causes of action for damages including, but not limited to any costs of recovering, reprogramming or reproducing any programs or data stored in or used with the GIS data, damage to property, damages for personal injury or for any lost profits, lost savings, or other special, incidental or consequential damages arising out of the use of or inability to use the GIS data, even if said parties have been advised of the possibility of such damage. Requestor agrees to indemnify and hold harmless the Nevada Bureau of Mines and Geology, the University of Nevada, Reno, and their agents, consultants, contractors and employees from any and all liability claims or damages to any person arising from or connected with the use of this GIS data.

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Contact_Organization: Nevada Bureau of Mines and Geology

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Contact_Position: web/GIS/database person

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Address_Type: mailing and physical address

Address: University of Nevada, Reno, MS 178

City: Reno

State_or_Province: NV

Postal_Code: 89557-0178

Country: USA

Contact_Voice_Telephone: 775-784-6691

Contact_Electronic_Mail_Address: nbmg@unr.edu

Hours_of_Service: 8:00 a.m. - 3:00 p.m. (PST)

Contact_Instructions: web/GIS/database person

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