Page 14 - Geology and Geochemistry of Oil and Gas

NOMENCLATURE xiii
R(z) vertical water density change
R electric resistivity
apparent resistivity
R a
R a (AO) apparent resistivity from lateral sonde of AO size
cut-off (critical) resistivity of oil-saturated reservoir
R cr
resistivity of gas-saturated reservoir
R g,r
oil resistivity
R oil
resistivity of oil-saturated reservoir
R o,r
shale resistivity
R sh
true resistivity of rock
R t
minimum true resistivity
R t,min
water resistivity
R w
resistivity of water-saturated reservoir
R o
drilling-mud resistivity
R m
mud-filtrate resistivity
R mf
resistivity from induction log
R IL
r correlation coefficient
r radius
radius of capillaries
r c
S o oil saturation
S o/g oil/gas saturation
residual oil saturation
S o,r
water saturation
S w
residual water saturation
S w,r
homogeneity of carbonates
S carb
sorting factor
S sort
sorting of shales
S sh
sorting of sandstones
S ss
specific surface area of pore space per unit of bulk volume
s b
specific surface area of pore space per unit of grain volume
s g
specific surface area of pore space per unit of pore volume
s p
shape factor for pores
s hf
SG specific gravity
T temperature
DT interval transit time
t time
probability index at confidence level a
t a
U relative change in volume of sediments
DU SP relative SP factor
V volume
volume of capillaries
V c
V AHFP rate of AHFP formation
rate of creation of elastic stress
V elast
rate of stress relaxation
V relax