Page 4 - Basic Well Log Analysis for Geologist

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LoG ABBREVIATIONS USED IN TEXT

a - tortuosity factor
BHT - bottom hole temperature
BVW - bulk volume water
C - conductivity
CNEL - compensated neutron log
C, - compaction factor for sonic porosity
Arj - radius of invaded zone
At - interval transit time of formation
At - interval transit time of fluid in borehole
Atma - interval transit time of formation matrix
d, - diameter of borehole
d, - diameter of invaded zone (flushed zone)
d; - diameter of invaded zone
F - formation factor
FDC - formation density compensated log
GR 6, - gamma ray reading from formation
GR». — - gamma ray reading from shale
GRain > gamma ray reading from clean sand
fine - thickness of mudcake
kK, - absolute permeability
kK, - effective permeability
K,g - relative permeability to gas
K,, - relative permeability to oil
Kew - relative permeability to water
m - cementation exponent
MIL - Microlog”
MLL - Microlaterolog’
MOS - moveable oil saturation (S,, - S,)
PL - Proximity Log*
D - porosity
PSP - pseudostatie spontaneous potential
Dy - bulk density of the formation
P; - density of fluid in the borehole
Py - hydrocarbon density
Pina - density of the formation matrix
Re - resistivity of shallow focused log
R, - resistivity of invaded zone
Riv - resistivity induction log medium
Rip - resistivity induction log deep
Rig - resistivity of Laterolog* deep
Ry, - - resistivity of Laterolog* shallow
R, - resistivity of drilling mud
Rune - resistivity of mudeake
Rw - resistivity of mud filtrate
Rus: - resistivity of Mierospherically Focused Log*
R, - resistivity of the formation 100% water saturated
(i.e. Wet resistivity)
ROS - residual oil saturation (1.0 — S,,)

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