Chapter 3
Here EAf]w = K„fe=O)+M„,(g = O)+M„,„(g = O) [3.22]
Eq. [3.21] can be rewritten as:
R = *emulRemul + KOüRoU + ^waterRwater [323]
Here к is signal attenuation fraction of each phase.
, -Moil(g = 0) -Memul(g = 0) _Mwater(g = Q)
'0il [∑^]g=o ’ emul [∑>]g=o ’ water [∑>]g=o
[Э.24]
Λ4(fe, g=0) in Eq. [3.22] is associated to the T2 distribution of each phase. ⅛ is
echo spacing time, which is 2τ for basic PGSE sequence or T+2τ for stimulated
spin-echo PGSE sequence.
If T2 distribution peaks for oil, emulsified water and bulk water are completely
separate, M (tE, g=0) can be expressed as:
M.„(g = 0)=M⅛aH⅛∑xl exp(-⅛ [3.25]
i i
M.,Jg = 0) = M⅛-∑, exp(-⅛ [3.26]
∣ 11,i
M^,r(g = 0) = M‰∑>, exp(-⅛ [3.27]
i 11,i
HI is hydrogen index of fluid, which is 1 for water. Φ is component fraction of
oil, emulsified water or bulk water, xl is normalized fraction of component with
relaxation time T2,i in T2 distribution peak of oil, emulsified water or bulk water.
Ж=т2,,.) n9ftl
Yfl(T2=T2j) 1 j
so
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