Glossary

Magnetometer

A device for detecting and measuring magnetic field strength. Within downhole orientation cartridges three mutually perpendicular flux-gate magnetometers measure the Earth's magnetic field relative to the tool axis, allowing orientation to the magnetic field, of known orientation, at that location.

As magnetometer readings are affected by the presence of ferrous material, readings are unreliable in casing.

We have observed that localised up-hole variations in the magnetic data can be used to help detect, discriminate and interpret intruded versus extruded basic (magnetite bearing) igneous rock bodies.

SHERIFF, R. E. 1973. Encyclopedic Dictionary of Exploration Geophysics. Society of Exploration Geophysicists, Tulsa, p266.

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About the glossary
This listing is not exhaustive or definitive, do not expect Oxford English Dictionary standards; it is aimed at those who need to understand basic principles and those that read reports on dipmeters and borehole images requiring some technical help to get the most from such documents.

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Acknowledgements
This listing has been derived by Task Geoscientists. All external sources are fully acknowledged.