Magnetic and Telluric application to locate fresh water

Weatherby Energy puts many scientific principles to work when drilling for oil and gas. Two methods that are used by in drilling include the use of magnetic and telluric applications to locate fresh water. These methods are invaluable in helping Weatherby Energy to increase its chance of success when drilling.

Magnetic and Telluric Applications to Locate Fresh Water

Magnetic and telluric applications used by Weatherby Energy to locate fresh water involve a focus on the variations of magnetism between various minerals and on telluric currents, which are low frequency electric currents that move near the surface of the earth.

There is magnetism in minerals such as iron, titanium, magnetite, pyrrhotite, and greigite, which are found in certain rocks. Rocks with these magnetic minerals will have a small influence on the earth’s magnetic field. Moving groundwater also has an electromagnetic field and Weatherby Energy can use this property to locate it.

Magnetic Currents

Understanding the use of magnetic currents to locate water involves understanding the process of how and why these waves are created:

• Seismic waves moving through water bearing rock will produce electric signals, which can be recorded.
• A small explosion in the ground starts the sound waves and they will slightly move all the formations.
• If there is water there, it will be displaced and that will cause an electrical signal.
• If there is no water, the signal will not be produced.

This method will show water but not show the amount of salt in it. However, if the salinity is higher than 1000 parts per million, a signal will not be generated. When it is important to distinguish between salt and fresh water, two other types of electromagnetic surveys can also be useful in finding water: Time Domain Electromagnetic (TDEM) and Frequency Domain Electromagnetic (FDEM).

Both TDEM and FDEM measure electric current traveling through the ground by generating an electric field. Measuring this electrical resistivity is useful for pinpointing ground water because TDEM methods can distinguish between salt and fresh water due to their differences in their electrical properties. FDEM is good at locating water bearing faults and mapping lateral changes in the land formations.

Telluric Methods

Understanding telluric currents is also important. Telluric currents travel in the upper layers of the earth and are affected by natural and human causes. They move towards the sun during the day and towards the poles at night. Electrodes placed on the ground can identify and measure these currents. Telluric methods for finding ground water measure the resistivity of substances below the ground.

Magnetotelluric Methods

Combining magnetic and telluric methods gives you the magnetotelluric method of exploring. It measures and compares the fluctuations of both the telluric currents and magnetic fields.

The magnetotelluric method, or MT method, is based on the premise that the most influenced physical property of land by temperature and water is its electrical resistivity. That is why it is used to find natural resources, including minerals, water, hydrocarbons, and even sources of geothermal energy.

This method can reach tens of thousands of feet below the surface of the land but is also useful for more shallow applications. In using this method, the electrodes on the surface will measure two components of the electrical telluric currents and three components of the natural magnetic fields. This gives a more complete representation of the underlying rock structure and will show where the water is located.
Using Science

Weatherby Energy has extensive knowledge of these methods of understanding what is below the ground before drilling or digging. Weatherby Energy can put this knowledge and skill to work for investors.


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