Page 321 - Principles of Applied Reservoir Simulation 2E

306 Principles of Applied Reservoir Simulation

Block TOP = BOT - THICK
Water zone thickness
WTHICK = BOT - WOC
Gas zone thickness
GTHICK = GOC - TOP
The user must specify the initial oil saturation (SOI) for an oil-water system and
the initial gas saturation (SGI) for a water-gas system. Given the initial
saturations SOI and SGI, the following algorithm is applied [Fanchi, 1986].

Case GOC S, = 0
1 TOP S 0 = SOI
BOT S w=l-SOI
WOC

Case TOP , f GTHICK If ^^^^ then
GOC }ft g
2 THICK 5 0-°0
fg SGI
WOC , WTHICK s = *
BOT } A f g
THICK

o w - 1 - 5 0 - bg
O
C
C*
I
*
Case TOP , l GTHICK US 0 < S or, then
3 GOC THICK S — 0
BOT J-' S 0=\- SOI*f
WOC 5 W = 1 - 5G/
S g = (l-f)*SGI
S g - SGI
C = 1 C C
^w L - *->o " ^g
Case GOC f_ l WTHICK lfS 0 < S or, then
4 TOP THICK S 0 = 0

[/ 5 = 0 5 W = 1
WOC ; g
BOT S w = 1 - SOI*f
S 0 = SOI*f