Multi-function natural gamma ray logging system
 A multi-function 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 abundancies or concentrations of potassium (K), uranium (U) and thorium (T). 
Halliburton Company
G
G01V
inventional
Harry D. Dan M.
Smith, Jr. Arnold