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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
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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