Page 42 - Basic Well Log Analysis for Geologist
P. 42

BASIC  RELATIONSHIPS  OF  WELL  LOG  INTERPRETATION






























































       Figure  9.   Because  resistivity  varies  with  changes  in  temperature.  you  must  adjust  before  calculation.  Use  the  chart  on  the  opposite
              page.
              Courtesy.  Schlumberger  Well  Services.
              Copyright  1972,  Schlumberger.
              Given:  Resistivity  of  drilling  mud  (R,,)  equals  1.2  at 75°F.  Formation  temperature  (T;)  =  160°.
              Procedure:
                     1.  Locate  the  resistivity  value,  |.2,  on  the  scale  at  the  bottom  of  the  chart.
                      No   Follow  the  vertical  line  up  to  a  temperature  value  of  75°F  (point  A  on  the  chart).
                      ‘nm   Follow  the  diagonal  line  (constant  salinity)  to  where  it  intersects  a  temperature  value  of  160°F  (point  B  on  the
                        chart).
                     4.  From  point  B,  follow  the  vertical  line  to  the  scale  at  the  bottom.  and  find  a  resistivity  value  of  0.56.







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