Aeromagnetic Survey

GEOTHERMAL ENERGY

Exploration Technique: Aeromagnetic Survey

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Exploration Technique Information
Exploration Group:	Geophysical Techniques
Exploration Sub Group:	Magnetic Techniques
Parent Exploration Technique:	Magnetic Techniques
Information Provided by Technique
Lithology:
Stratigraphic/Structural:	map structure, basin fill thickness, and magnetic mineral concentrations in ore bodies
Hydrological:
Thermal:
Cost Information
Low-End Estimate (USD):	22.53 2,253 centUSD 0.0225 kUSD 2.253e-5 MUSD 2.253e-8 TUSD / mile
Median Estimate (USD):	167.34 16,734 centUSD 0.167 kUSD 1.6734e-4 MUSD 1.6734e-7 TUSD / mile
High-End Estimate (USD):	1,126.30 112,630 centUSD 1.126 kUSD 0.00113 MUSD 1.1263e-6 TUSD / mile
Time Required
Low-End Estimate:	0.26 days 7.118412e-4 years 6.24 hours 0.0371 weeks 0.00854 months / 100 mile
Median Estimate:	0.86 days 0.00235 years 20.64 hours 0.123 weeks 0.0283 months / 100 mile
High-End Estimate:	2.33 days 0.00638 years 55.92 hours 0.333 weeks 0.0766 months / 100 mile

Aeromagnetic Survey:

Aeromagnetic surveys measure variations in Earth’s magnetic field using high-precision magnetometers (0.1 nanoTesla sensitivity) and are flown using a helicopter, fixed wing, or ultra light aircraft, depending on location and topographic relief.

Other definitions:Wikipedia Reegle

 

Use in Geothermal Exploration

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  Mapping Structure

  • In geothermal exploration, magnetic surveys are used to determine basement depth and to locate concealed intrusive, faults, and areas of hydrothermal alteration.
  • Intrusive rocks are associated with magnetic highs (alternatively sedimentary rocks are associated with lows); while the location of faults and zones of hydrothermally altered rocks are associated with magnetic lows.'"`UNIQ--ref-00000000-QINU`"'
  • In general, the use of magnetic methods provide useful first-order datasets that can be used to define prospects in a broad context." cannot be used as a page name in this wiki.
  • The given value was not understood.

Mapping Structure

• In geothermal exploration, magnetic surveys are used to determine basement depth and to locate concealed intrusive, faults, and areas of hydrothermal alteration.
• Intrusive rocks are associated with magnetic highs (alternatively sedimentary rocks are associated with lows); while the location of faults and zones of hydrothermally altered rocks are associated with magnetic lows.
• In general, the use of magnetic methods provide useful first-order datasets that can be used to define prospects in a broad context.

 

Data Access and Acquisition

The given value was not understood.

• On a regional scale, aeromag data has flown at 2-5 km line spacings over much of the western U.S.
• Higher resolution, prospect-scale data is typically collected at constant, low elevation (80-150 m above ground surface) on 0.25-0.50 km line spacings using an ultra-light aircraft.

 

Best Practices

The given value was not understood.

• As with gravity data, magnetic results are rarely unique and other data are needed to fully interpret and understand them.
• As a standalone method, magnetic surveys tend to be less informative than other methods due to low depth of penetration and resolution, complexity of interpretation, and insensitivity to the presence of water.
• Joint inversion of magnetic data with gravity or other geophysical data types, however, makes it more useful.

 

Potential Pitfalls

• In the past, magnetic surveys were used to determine Curie isotherm depths (i.e., the depth at which temperatures are high enough to cause rock demagnetization), which could be used to indicate depth to thermal anomalies, but subsequent work has proven otherwise.

The given value was not understood.

 

References

Page	Area	Activity Start Date	Activity End Date	Reference Material
Aeromagnetic Survey (Nannini, 1986)		1986	1986	Some Aspects Of Exploration In Non-Volcanic Areas
Aeromagnetic Survey At Baltazor Hot Springs Area (Isherwood & Mabey, 1978)	Baltazor Hot Springs Area			Evaluation Of Baltazor Known Geothermal Resources Area, Nevada
Aeromagnetic Survey At Blue Mountain Geothermal Area (Fairbank Engineering Ltd, 2003)	Blue Mountain Geothermal Area	1988	1988	Phase I Report U.S. DOE GRED II Program
Aeromagnetic Survey At Blue Mountain Geothermal Area (U.S. Geological Survey, 2012)	Blue Mountain Geothermal Area	2008	2009	Geophysical Studies in the Vicinity of Blue Mountain and Pumpernickel Valley near Winnemucca, North-Central Nevada
Aeromagnetic Survey At Chena Area (Erkan, Et. Al., 2008)	Chena Geothermal Area		2008	Understanding The Chena Hot Springs, Alaska, Geothermal System Using Temperature And Pressure Data From Exploration Boreholes
Aeromagnetic Survey At Chena Geothermal Area (Kolker, 2008)	Chena Geothermal Area	2005	2007	Geologic Setting of the Central Alaskan Hot Springs Belt: Implications for Geothermal Resource Capacity and Sustainable Energy Production
Aeromagnetic Survey At Clear Lake Area (Skokan, 1993)	Clear Lake Area			Overview Of Electromagnetic Methods Applied In Active Volcanic Areas Of Western United States
Aeromagnetic Survey At Coso Geothermal Area (1977)	Coso Geothermal Area	1977	1977	Low-altitude aeromagnetic survey of a portion of the Coso Hot Springs KGRA, Inyo County, California
Aeromagnetic Survey At Coso Geothermal Area (1980)	Coso Geothermal Area	1980	1980	Aeromagnetic and gravity surveys in the Coso Range, California
Aeromagnetic Survey At Dixie Valley Geothermal Area (Grauch, 2002)	Dixie Valley Geothermal Area	2002	2002	High-Resolution Aeromagnetic Survey to Image Shallow Faults, Dixie Valley Geothermal Field, Nevada Geothermal Resource Analysis and Structure of Basin and Range Systems, Especially Dixie Valley Geothermal Field, Nevada Exploration and Development at Dixie Valley, Nevada- Summary of Doe Studies Why Basin and Range Systems are Hard to Find II- Structural Model of the Producing Geothermal System in Dixie Valley, Nevada
Aeromagnetic Survey At Glass Buttes Area (DOE GTP)	Glass Buttes Area			GTP ARRA Spreadsheet
Aeromagnetic Survey At Hualalai Northwest Rift Area (Thomas, 1986)	Hualalai Northwest Rift Area			Geothermal Resources Assessment In Hawaii
Aeromagnetic Survey At Kawaihae Area (Thomas, 1986)	Kawaihae Area			Geothermal Resources Assessment In Hawaii
Aeromagnetic Survey At Kilauea East Rift Geothermal Area (Gardner, Et Al., 1995)	Kilauea East Rift Geothermal Area	1986	1986	History and Results of Surface Exploration in the Kilauea East Rift Zone Aeromagnetic study of the Island of Hawaii
Aeromagnetic Survey At Kilauea East Rift Geothermal Area (Thomas, 1986)	Kilauea East Rift Geothermal Area	1978	1987	Geothermal Resources Assessment In Hawaii
Aeromagnetic Survey At Kilauea Southwest Rift And South Flank Area (Thomas, 1986)	Kilauea Southwest Rift And South Flank Area			Geothermal Resources Assessment In Hawaii
Aeromagnetic Survey At Kilauea Summit Area (Zablocki, 1978)	Kilauea Summit Area			Applications of the VLF Induction Method For Studying Some Volcanic Processes of Kilauea Volcano, Hawaii
Aeromagnetic Survey At Lightning Dock Area (Cunniff & Bowers, 2005)	Lightning Dock Area			Final technical report geothermal resource evaluation and definition (GRED) Program - Phase I, II and III for the Animas Valley, NM Geothermal Resource: special proprietary report to Lightning Dock Geothermal, Inc.
Aeromagnetic Survey At Lightning Dock Area (Warpinski, Et Al., 2002)	Lightning Dock Area			Geothermal Resource Exploration And Definition Project
Aeromagnetic Survey At Maui Area (DOE GTP)	Maui Area			GTP ARRA Spreadsheet
Aeromagnetic Survey At Mauna Loa Northeast Rift Area (Thomas, 1986)	Mauna Loa Northeast Rift Area			Geothermal Resources Assessment In Hawaii
Aeromagnetic Survey At Mokapu Penninsula Area (Thomas, 1986)	Mokapu Penninsula Area			Geothermal Resources Assessment In Hawaii
Aeromagnetic Survey At Mt Princeton Hot Springs Geothermal Area (Case, Et Al., 1984)	Mt Princeton Hot Springs Geothermal Area	1984	1984	Geologic interpretation of gravity and magnetic data in the Salida region, Colorado
Aeromagnetic Survey At Mt St Helens Area (Towle, 1983)	Mt St Helens Area			Vlf Electromagnetic Investigations Of The Crater And Central Dome Of Mount St Helens, Washington
Aeromagnetic Survey At Raft River Geothermal Area (1978)	Raft River Geothermal Area	1978	1978	Reconnaissance geophysical studies of the geothermal system in southern Raft River Valley, Idaho
Aeromagnetic Survey At Raft River Geothermal Area (1981)	Raft River Geothermal Area	1981	1981	Total field aeromagnetic map of the Raft River known Geothermal Resource Area, Idaho by the US Geological Survey
Aeromagnetic Survey At Roosevelt Hot Springs Geothermal Area (Faulder, 1991)	Roosevelt Hot Springs Geothermal Area	1991	1991	Conceptual Geologic Model and Native State Model of the Roosevelt Hot Springs Hydrothermal System
Aeromagnetic Survey At Roosevelt Hot Springs Geothermal Area (Ward, Et Al., 1978)	Roosevelt Hot Springs Geothermal Area	1978	1978	A Summary of the Geology, Geochemistry, and Geophysics of the Roosevelt Hot Springs Thermal Area, Utah
Aeromagnetic Survey At Waunita Hot Springs Geothermal Area (Lange, 1981)	Waunita Hot Springs Geothermal Area	1972	1972	The Geophysical Environment Around Waunita Hot Springs
Aeromagnetic Survey At Yellowstone Region (Finn & Morgan, 2002)	Yellowstone Caldera Geothermal Region			High-Resolution Aeromagnetic Mapping Of Volcanic Terrain, Yellowstone National Park

1. Baltazor Hot Springs Area
2. Blue Mountain Geothermal Area
3. Chena Geothermal Area
4. Clear Lake Area
5. Coso Geothermal Area
6. Dixie Valley Geothermal Area
7. Glass Buttes Area
8. Hualalai Northwest Rift Area
9. Kawaihae Area
10. Kilauea East Rift Geothermal Area
11. Kilauea Southwest Rift And South Flank Area
12. Kilauea Summit Area
13. Lightning Dock Area
14. Maui Area
15. Mauna Loa Northeast Rift Area
16. Mokapu Penninsula Area
17. Mt Princeton Hot Springs Geothermal Area
18. Mt St Helens Area
19. Raft River Geothermal Area
20. Roosevelt Hot Springs Geothermal Area
21. Waunita Hot Springs Geothermal Area
22. Yellowstone Caldera Geothermal Region

1. Yellowstone Caldera Geothermal Region

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