The number of naturally occurring gamma rays, from potassium, uranium, thorium, and associated daughter products, is counted by the detector in both natural gamma ray and spectral gamma ray tools.
Spectral tools also measure the energy of each detected gamma ray. The range, or spectrum, of energy detected is divided into windows, or limited energy ranges, which indicate the elemental gamma ray source (the specified isotopes of potassium, uranium, or thorium).
Interpretation Goals:
- Correlation of formations.
- Gross lithology.
- Estimate of shale (clay) content.
- Clay typing.
- Fracture identification.
- Source rock identification.
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