Difference between revisions of "Magnetotellurics"
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| − | Magnetotellurics (MT) is | + | Magnetotellurics (MT) is an electrical geophysical technique that measures the resistivity of the subsurface. Although MT cannot provide the resolution of [[Seismic data|seismic surveys]], it is less expensive and, more importantly, can be used in places where seismic data collection is impractical or gives poor results. This is the same physical parameter that is measured in a borehole resis- tivity log. |
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| + | ==How MT differs from electric logs== | ||
| + | MT differs from an inductive electric log in three major ways: | ||
| + | |||
| + | {| | ||
| + | | class = "wikitable" | ||
| + | |- | ||
| + | ! Magnetotellurics Measurements || Electric Log Measurements | ||
| + | |- | ||
| + | | Made from the surface || Made subsurface from inside a borehole | ||
| + | |- | ||
| + | | Depth of investigation is a function of both frequency at which the measurement is taken and the average resistivity of the subsurface || Depth of investigation is the depth of the borehole measuring device below the surface | ||
| + | |- | ||
| + | | Respond only to changes in average bulk resistivity || Respond to individual rock layers along the wall of the borehole | ||
| + | |} | ||
==See also== | ==See also== | ||
Revision as of 18:55, 17 April 2014
| Exploring for Oil and Gas Traps | |
| |
| Series | Treatise in Petroleum Geology |
|---|---|
| Part | Predicting the occurrence of oil and gas traps |
| Chapter | Applying magnetotellurics |
| Author | Arnie Ostrander |
| Link | Web page |
| Store | AAPG Store |
Magnetotellurics (MT) is an electrical geophysical technique that measures the resistivity of the subsurface. Although MT cannot provide the resolution of seismic surveys, it is less expensive and, more importantly, can be used in places where seismic data collection is impractical or gives poor results. This is the same physical parameter that is measured in a borehole resis- tivity log.
How MT differs from electric logs[edit]
MT differs from an inductive electric log in three major ways:
| class = "wikitable" | |
| Magnetotellurics Measurements | Electric Log Measurements |
|---|---|
| Made from the surface | Made subsurface from inside a borehole |
| Depth of investigation is a function of both frequency at which the measurement is taken and the average resistivity of the subsurface | Depth of investigation is the depth of the borehole measuring device below the surface |
| Respond only to changes in average bulk resistivity | Respond to individual rock layers along the wall of the borehole |
See also[edit]
- What is magnetotellurics (MT)?
- What does an MT survey measure?
- How are MT data acquired?
- Case history: frontier basin analysis (Amazon Basin, Colombia)
- Case history: rugged carbonate terrain (Highlands of Papua New Guinea)
- Case history: Precambrian overthrust (Northwestern Colorado)
- Case history: volcanic terrain (Columbia River Plateau)
External links[edit]
| find literature about Magnetotellurics |
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