1. Petroleum Project Economics Econ210D Presentation 5 Incremental Project Analysis Date

10. Expected Oil Recovery Factors ( % OOIP) Incremental Project Analysis Date Primary Methods Liquid and rock expansion 5 Solution gas drive 20 Gas cap expansion 30 Gravity drainage 40 Water influx 60

11. Expected Oil Recovery Factors ( % OOIP) Incremental Project Analysis Date Secondary Methods Gas re-injection Up to 70% Water flooding Up to 70%

12. Expected Oil Recovery Factors ( % OOIP) Incremental Project Analysis Date Tertiary Methods Thermal (Steam, Combustion, Hot water) Up to 80 % Miscible (CO2, HC gases, N2, Flue gas) Up to 80 % Chemical (Polymers, Surfactants) Up to 80 %

16. Year Oil Production MMbbls Oil Price ($/BBL) Total Capex $m Total Opex $m 1986 0 15.0 -30 0 1987 0 19.2 -22 0 1988 0 16.0 -112 0 1989 0 19.6 -110 0 1990 0 24.5 -77 0 1991 2 21.5 -10 -1.4 1992 4 20.6 -7 -2.8 1993 8 18.5 -4 -8.4 1994 15 17.2 0 -19.6 1995 14 18.4 0 -15.7 1996 14 22.2 0 -13.3 1997 12 20.6 -57 -11.3 1998 9 14.4 -23 -9.6 1999 10 19.3 0 -10.6 2000 9 30.3 0 -9 2001 8 25.9 0 -7.8 2002 7 26.1 0 -6.8 2003 6 31.1 0 -4.7 2004 5 41.4 0 -3.3 2005 0 56.5 0 0