carbonate gamma ray | Energy Glossary

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carbonate gamma ray

1. n. [Formation Evaluation]

A gamma ray log from which the uranium contribution has been subtracted. In some rocks, and in particular in carbonate rocks, the contribution from uranium can be large and erratic and can cause the carbonate to be mistaken for a shale. The carbonate gamma ray is then a better indicator of shaliness.

Synonyms: corrected gamma ray

See: natural gamma ray spectroscopypotassiumthorium