Figure F100. Natural gamma radiation (NGR) of cuttings mix measured using the whole-round multisensor core logger (MSCL-W) and downhole logging data for gamma radiation (GR) from logging while drilling (LWD), Hole C0002F. Logging data are converted to counts per second for comparison with MSCL-W data: NGR (cps) = (GR [gAPI] – 12)/2.12 (Mountain, Miller, Blum, et al., 1994). Notable correlations between MSCL-W NGR and LWD-GR (blue and red circles) suggest a depth shift between cuttings and logging. Underreamer depths are shown as a reference.
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