D-1
Million Tonnes
DISCOVERED RECOVERABLE OIL RESERVES AND CUMULATIVE PRODUCTION SINCE 1975
3500
3000
2500
2000
1500
1000
500
0
1975
77
Cumulative Production
79
81
83
85
87
コ
Initial Reserves
(proven plus probable)
Initial Reserves (possible)
The graph shows how estimated total initial oil reserves in present discoveries have varied since 1975. Whilst most of the increase at the proven plus probable level are the result of increases in producing fields, increasingly sophisticated reservoir management in some fields has led to significantly higher recovery factors than originally envisaged. Cumulative production is shown on a year by year basis.
Source:
Department of Energy
DATED
ANNEX D TO
D/ACDS (CONCEPTS)108/5
OCT 89
COSSEC G.O. 0735-02/89 CSC 00732/2