OPEN HOLE WIRELINE LOGGING Self Learning Module

The table below shows typical GR levels (in API units) for a number of common minerals and formation materials. The radioactivity levels are largely a result of potassium content. Rock Type GR Reading Rock Type GR Reading Sandstone 10 -20 Limestone 5 - 10 Dolomite 10 - 20 Shale 80 - 140 Halite 0 Sylvite(KCl) 500 Coal 0 Mica 100- 170

  Levels, Radioactivity, Radioactivity levels