Page 45 - Basic Well Log Analysis for Geologist
P. 45

“HE  SPONTANEOUS  POTENTIAL  LOG


















                                                                                     Rur>>Rw
                                                                            LINE
                                                                                     ALL  SANDS

                       SHALE   LINE  BASE                               SHALE   BASE   THICK  CLEAN


                                                                                    WET  SAND
                                                            SSP

                                         =
                                    Ror Rw
                                                             SP                     THIN  SAND





                                    Rar  >Rw                PSP                     THICK  SHALY
                                                                                    WET  SAND






                                                                                    THICK  CLEAN
                                    RmMFoeRw                 SP
                                                                                    GAS  SAND


                                    Rar  <Rw                PSP                     THICK  SHALY





                                                                                    GAS  SAND





                                                                       SSP  =—  K  x  log  (RMF/  Rw)

                            10A













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