Magnetotellurics

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Exploration Technique: Magnetotellurics

Exploration Technique Information
Exploration Group: Geophysical Techniques
Exploration Sub Group: Electrical Techniques
Parent Exploration Technique: Magnetotelluric Techniques
Information Provided by Technique
Lithology: Rock composition, mineral and clay content
Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults
Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water
Thermal: Resistivity influenced by temperature
Cost Information
Low-End Estimate (USD): 522.2252,222 centUSD
0.522 kUSD
5.2222e-4 MUSD
5.2222e-7 TUSD
/ station
Median Estimate (USD): 1,738.83173,883 centUSD
1.739 kUSD
0.00174 MUSD
1.73883e-6 TUSD
/ station
High-End Estimate (USD): 2,297.62229,762 centUSD
2.298 kUSD
0.0023 MUSD
2.29762e-6 TUSD
/ station
Time Required
Low-End Estimate: 1.67 days0.00457 years
40.08 hours
0.239 weeks
0.0549 months
/ 10 stn
Median Estimate: 3.77 days0.0103 years
90.48 hours
0.539 weeks
0.124 months
/ 10 stn
High-End Estimate: 7.50 days0.0205 years
180 hours
1.071 weeks
0.246 months
/ 10 stn
Additional Info
Cost/Time Dependency: Location, Size, Resolution, Terrain, Weather
Dictionary.png
Magnetotellurics:
Magnetotellurics (MT) is a natural-source (i.e., passive), electromagnetic method that measures the ratio of earth’s naturally varying electric and magnetic fields over a wide range of frequencies to determine the resistivity structure of the subsurface (Reynolds, 1997).
Other definitions:Wikipedia Reegle


 
Introduction
See Magnetotelluric Techniques

MT is currently the resistivity method of choice for many geothermal exploration companies due in large part to its superior range of depth of penetration (several tens of meters to several tens of kilometers) over other resistivity methods.
 
Use in Geothermal Exploration
See Electrical Techniques: Use in Geothermal Exploration

In geothermal applications MT can be used to delineate the resource by indirectly mapping the smectite clay ring (where low temperature clay alteration transits to more resistive higher temperature alteration) that typically exists around a geothermal resource. MT is commonly used in the volcanic settings (such as the Cascades Region), because most projects are relatively deep, and most successful conventional resources will have a thick clay cap.

 
Field Procedures
A magnetotelluric survey consists of electric and magnetic measurements at the earth's surface.

Typical layout for a standard MT recording station, indicating relative electrode line and induction magnetometer positions.[1]

 
Data Access and Acquisition
Metronix ADU07 data logger.[2]


Magnetotelluric time series with each recorded channel indicated. Ex and Ey are the electrical measurements while Hx, Hy and Hz are the three components of the magnetic field measurements.[2]

 
Potential Pitfalls



 
References
  1. (Moombariga Geoscience, 2009) "Magnetotelluric Methods "
  2. 2.0 2.1 (Metronix, n.d.) "ADU-07e Product Memo "


Page Area Activity Start Date Activity End Date Reference Material
Magnetotellurics (Laney, 2005) Unspecified


Magnetotellurics (Muse, 1973) Unspecified


Magnetotellurics At Akutan Fumaroles Area (Kolker, Et Al., 2010) Akutan Fumaroles Area


Magnetotellurics At Alum Area (DOE GTP) Alum Geothermal Area


Magnetotellurics At Beowawe Hot Springs Area (Garg, Et Al., 2007) Beowawe Hot Springs Area


Magnetotellurics At Brady Hot Springs Area (Combs 2006) Brady Hot Springs Area


Magnetotellurics At Central Nevada Seismic Zone Region (Pritchett, 2004) Central Nevada Seismic Zone Geothermal Region


Magnetotellurics At Coso Geothermal Area (2004) Coso Geothermal Area 2004 2004


Magnetotellurics At Coso Geothermal Area (2006) Coso Geothermal Area 2006 2006


Magnetotellurics At Cove Fort Area (Toksoz, Et Al, 2010) Cove Fort Geothermal Area


Magnetotellurics At Dixie Hot Springs Area (Combs 2006) Dixie Hot Springs Area


Magnetotellurics At Dixie Valley Geothermal Area (Iovenitti, Et Al., 2013) Dixie Valley Geothermal Area 2012 2012


Magnetotellurics At Dixie Valley Geothermal Area (Laney, 2005) Dixie Valley Geothermal Area 2003 2003


Magnetotellurics At Dixie Valley Geothermal Area (Wannamaker, Et Al., 2006) Dixie Valley Geothermal Area 2006 2006


Magnetotellurics At Dixie Valley Geothermal Area (Wannamaker, Et Al., 2007) Dixie Valley Geothermal Area 2006 2007


Magnetotellurics At Glass Mountain Area (Cumming And Mackie, 2007) Glass Mountain Geothermal Area


Magnetotellurics At Grass Valley Area (Morrison, Et Al., 1979) Grass Valley Area


Magnetotellurics At International Geothermal Area, Indonesia (Laney, 2005) International Geothermal Area Indonesia


Magnetotellurics At Jemez Pueblo Area (DOE GTP) Jemez Pueblo Area


Magnetotellurics At Kilauea East Rift Geothermal Area (Laney, 2005) Kilauea East Rift Geothermal Area 2003 2004


Magnetotellurics At Kilauea Southwest Rift And South Flank Area (Laney, 2005) Kilauea Southwest Rift And South Flank Area


Magnetotellurics At Long Valley Caldera Geothermal Area (Hermance, Et Al., 1988) Long Valley Caldera Geothermal Area 1988 1991


Magnetotellurics At Long Valley Caldera Geothermal Area (Nordquist, 1987) Long Valley Caldera Geothermal Area 1986


Magnetotellurics At Mccoy Geothermal Area (DOE GTP) Mccoy Geothermal Area


Magnetotellurics At Mcgee Mountain Area (DOE GTP) Mcgee Mountain Area


Magnetotellurics At New River Area (DOE GTP) New River Area


Magnetotellurics At Newberry Caldera Area (DOE GTP) Newberry Caldera Area


Magnetotellurics At Northern Basin & Range Region (Pritchett, 2004) Northern Basin and Range Geothermal Region


Magnetotellurics At Nw Basin & Range Region (Pritchett, 2004) Northwest Basin and Range Geothermal Region


Magnetotellurics At Raft River Geothermal Area (1977) Raft River Geothermal Area 1977 1977


Magnetotellurics At Rio Grande Rift Region (Aiken & Ander, 1981) Rio Grande Rift Geothermal Region


Magnetotellurics At Roosevelt Hot Springs Area (Combs 2006) Roosevelt Hot Springs Area


Magnetotellurics At Roosevelt Hot Springs Geothermal Area (Ward, Et Al., 1978) Roosevelt Hot Springs Geothermal Area 1978 1978


Magnetotellurics At Salt Wells Area (Bureau of Land Management, 2009) Salt Wells Geothermal Area 2008 2008


Magnetotellurics At Silver Peak Area (DOE GTP) Silver Peak Area


Magnetotellurics At Socorro Mountain Area (Owens, Et Al., 2005) Socorro Mountain Area


Magnetotellurics At Soda Lake Area (Combs 2006) Soda Lake Area


Magnetotellurics At Stillwater Area (Laney, 2005) Stillwater Area


Magnetotellurics At Truckhaven Area (Layman Energy Associates, 2010) Truckhaven Area


Magnetotellurics At Truckhaven Area (Warpinski, Et Al., 2004) Truckhaven Area


Magnetotellurics At U.S. West Region (Aiken & Ander, 1981) U.S. West Region


Magnetotellurics At Valles Caldera - Redondo Geothermal Area (Wilt & Haar, 1986) Valles Caldera - Redondo Geothermal Area 1986


Magnetotellurics At Valles Caldera - Sulphur Springs Geothermal Area (Wilt & Haar, 1986) Valles Caldera - Sulphur Springs Geothermal Area 1986


Magnetotellurics At Walker-Lane Transitional Zone Region (Pritchett, 2004) Walker-Lane Transition Zone Geothermal Region

Document # Analysis
Type
Applicant Geothermal
Area
Lead
Agency
District
Office
Field
Office
Mineral
Manager
Surface
Manager
Development
Phase(s)
Techniques
DOI-BLM-NV-B020-2010-0106-CX CX Sierra Geothermal Power Alum Geothermal Area Bureau of Land Management BLM Battle Mountain District Office Bureau of Land Management Bureau of Land Management Geothermal/Exploration Hyperspectral Imaging
Magnetotellurics
Slim Holes
Z-Axis Tipper Electromagnetics
Magnetic Techniques
NVN-084629 CU Vulcan Energy Patua Geothermal Area BLM Nevada State Office BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Magnetotellurics
NVN-086285 CU Magma Energy Desert Peak Geothermal Area BLM BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Magnetotellurics
NVN-086286 CU Magma Energy Desert Queen Geothermal Area BLM Nevada State Office BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Magnetotellurics
NVN-086761 CU Colado Project, LLC BLM Nevada State Office BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Magnetotellurics
NVN-087791 CU TGP Dixie Development Company New York Canyon Geothermal Area BLM Nevada State Office BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Magnetotellurics
NVN-087811 CU TGP Dixie Development Co New York Canyon Geothermal Area BLM Nevada State Office BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Magnetotellurics
NVN-89306 CU Terra Gen Dixie Valley Development Co BLM Nevada State Office BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Magnetotellurics


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