What does a Caliper Log primarily measure?

A Caliper Log is primarily used to measure the diameter of the borehole. This log is critical for understanding the physical dimensions of the borehole, which can be influenced by factors such as drilling techniques, geological formations, and the presence of water. The measurement of borehole diameter can also help identify issues like washouts or irregularities in the borehole walls, important for ensuring the integrity of well construction and monitoring.

While other tools and logs measure different properties, such as water temperature, gamma radiation levels, or porosity, the unique function of a Caliper Log is focused on documenting the borehole's dimensions, thus providing essential data to hydrogeologists and engineers involved in groundwater studies and resource management.