Multi-function natural gamma ray logging.

摘要

A multi-functional compensated spectral natural gamma ray logging method provides for determining formation and borehole characteristics directly from naturally occurring formation radiation. The method, which measures formation lithology in open holes and mean casing thickness in cased wells, incorporates active compensation for differences in borehole conditions when calculating relative elemental formation abundacies or concentrations of potassium (K), uranium (U) and thorium (T).