Page 336 - Petrophysics 2E
P. 336

NOMENCLATURE            305


                                    laminar and dispersed clays in this formation. Calculate a, m, R,,
                                    and S, for Zones 1, 2, and 3, knowing Rsh  = 1.7 ohm-m.

                            1 1. Determine the sonic porosity of a semiconsolidated sandstone given
                                that:

                                 t = 84 p/ft          tma  = 47.5 ~s/ft

                                tf = 189 Ps/ft        B,,  = 1.3

                            12. Given the following data and Table 4D,


                                Irreducible water saturation   23.58%
                                Formation water resistivity    0.0531 ohm-m
                                Cementation factor             1.89
                                Coefficients a, n              1.0, 2.0
                                GRmax                          120
                                GRmin                          8.0

                                A.  Calculate the reservoir quality index and plot it against average
                                   porosity. Comment on the type of  shale from the slope of the
                                   lines.
                                B.  Once the shale type is determined in Problem 9, calculate vertical
                                   permeability for  all the  recognizable flow  units  by  choosing
                                   proper permeability models. Use a porosity value of  15%, Vsh  =
                                   40%, Rsh  = 50 ohm-m, and Rt  = 100 ohm-m for all flow units.
                                   Compare the results.




                     NOMENCLATURE


                                  crosssectional area
                                  correlation constant
                                  formation volume factor
                                  specific conductance of clay counterions
                                  specific conductance of a core
                                  specific conductance of clay exhange cation
                                  specific conductance of water CEC cation exchange capacity
                                  equivalent conductance of CEC
                                  diameter
                                  grain diameter
                                  transit time
                                  voltage
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