ABSTRACT

The recent improvements in the methods of making and interpreting natural gamma-ray and neutron well logs are discussed. The first step in establishing the interpretation consists in determining how the various features are expressed under normal conditions. The effects of unusual conditions and the exceptions to the general rules of interpretation are also dealt with. Other topics described in the paper are the accuracy, errors, and limitations of natural gamma-ray and neutron well logs, their uses and advantages, and the problems on which further research is needed.

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