Page 38 - Open-Hole Log Analysis and Formation Evaluation
P. 38

FIGURE
           14.8





           Gamma  Ray  Log.



           Courtesy

                ao  GR   Curves   recorded:   oe   gamma   ray  activity   formation   detector   measures  natural   Scintillation   Operating   principle:   cased-hole  tools   and  all  open-  and   Any   Often   combined  with:   :   None   Limitations:   discriminator   Sand/shale   Purpose:   Industries,  Inc.  cased  hole.   or      Open   When  run:   FIGURE  1A.9   Gamma  Ray   Spectral  Log.   Courtesy   Dresser  Atlas,   Dresser   GR  Boo  &   abbreviations:
           WELEX,



           a  Halliburton



           Company.
   33   34   35   36   37   38   39   40   41   42   43