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