ICP = 33 as ICP = 31, except that the capillary pressures are modified for small gas saturations to reduce the derivative.
If SlS_lSl + SnS_nSn > 0.99,
Pcgn=Pcgn1−Sl−Sn0.01{P_{cgn}}\quad = \quad {P_{cgn}}\frac{{1 - {S_l} - {S_n}}}{{0.01}}Pcgn=Pcgn0.011−Sl−Sn
If SlS_lSl > 0.99,
Pcnl=Pcnl1−Sl0.01{P_{cnl}}\quad = \quad {P_{cnl}}\frac{{1 - {S_l}}}{{0.01}}Pcnl=Pcnl0.011−Sl