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SIGMA (Invasion (Mixed filtrate & brine, Mixed sigma, Time lapse),…
SIGMA
Mud
WBM 100-140 kppm
OBM ~15 kppm
Invasion
Mixed filtrate & brine
Mixed sigma
Time lapse
Neutrons
emission: fast
H-atom collisions lose energy
#
slowed down neutrons
'thermal'
thermals get
'captured'
capture:
emission of gamma ray
neutrons move from detectors untill captured
near and far
if near =~ far, then
rapid slowdown, high hydrogen =>
high phi
if near << far, then
neutrons moved away from emission =>
low phi
Capture process
hydrogen
chlorine
others (matrix)
Sigma =
Phi x Sigma_fluid + (1-Phi) x Sigma_matrix