Uses the same principles as medical MRI except uses the EArth's magnetic field in place of an electromagnet.
This specific company says their tech can:
"GMR MEASUREMENTS PROVIDE
- Non-invasive direct detection of groundwater
- Spatial resolution of hydrogeologic parameters in 1D, 2D, or even 3D
- Quantitative determination of water content and porosity
- Estimation of mobile versus bound water content
- Estimation of relative or calibrated hydraulic conductivity and transmissivity
- Investigation to depths up to 150 meters
GMR APPLICATIONS IN HYDROLOGY INCLUDE
- Groundwater exploration and well site selection
- Determination of water storage and specific yield
- “Virtual pump testing”: estimation of aquifer properties
- Imaging of preferential flow zones (e.g. fractures, karst conduits, paleochannels)
- Parameterization of groundwater models at local to basin scales
- Integration of logging and surface-based NMR measurements"
Shows 2D groundwater imaging
Shows mobile and bound water
This may be useful to see changes in ground water distribution and possible induced flows as a result of fracking.
I think that the hydrogen in water and methane will respond differently in MRI so detection of methane in water may be possible.
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