1.1 What Is Logging?
A wireline log is a continuous record of measurements made in a borehole by a probe
able to respond to variations in some physical property of the rocks through which
the borehole is drilled. Logs are traditionally displayed on gridded paper - Figure 1.1.
Today, however, the primary record is likely to be a digital representation, paper logs
being used primarily to help summarise results, and as a secondary archive medium.