Glossary

Calipers

A logging device for measuring hole diameter or radius. Can involve spring arm devices (dipmeters and resistivity imaging tools) and acoustic determinations that are based on return times for a ultrasonic pulse through a mud of known sonic velocity. Essential for deriving the geometry of data gathered during image and dipmeter runs, and a major source of variables controlling dip quality.

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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.

We have attempted to make the descriptions and explanations generic, giving the glossary a wide application and appeal, with minimal, if any, commercial bias. If you spot any mistakes, omissions or any problems with the explanations, please do not hesitate to contact us, and we will try to accommodate your comments.

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