welllog
A welllog is a continuous record of the physical properties of geological formations encountered in a borehole. It is created by lowering sensors into the well and recording measurements as a function of depth. Welllogs are used to characterize lithology, porosity, fluid content, and rock mechanics, and they play a central role in formation evaluation for hydrocarbon exploration, groundwater studies, and engineering projects.
Welllogs are obtained in two main contexts: open-hole logging, where measurements are made before casing, and
Data from welllogs are typically presented as depth versus value curves and stored in digital formats such
Limitations of welllog interpretation arise from borehole conditions, mud filtrate effects, borehole rugosity, and casing in