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Table 3.2<br />

Estimates of world crude oil and NGLs resources billion barrels<br />

OPEC Non-OPEC Total world<br />

Cumulative production to 2009 (a) 437 627 1,063<br />

Proved reserves (b) 1,064 273 1,337<br />

Reserves to be added ultimately (c) 553 513 1,066<br />

Of which:<br />

Reserves growth 342 163 505<br />

Discoveries yet to be made 211 350 561<br />

Original Endowment (a) + (b) + (c) 2,054 1,413 3,465<br />

Sources: USGS World Petroleum Assessment 2000, OPEC Annual Statistical Bulletin, 2009, IHS PEPS<br />

database, Secretariat estimates.<br />

possible guide to the future. The R/P ratio, using the current levels of global production<br />

and the current estimates of global proven reserves for 2009, amounts to<br />

just 43 years. For non-OPEC, it is in fact, less than 15 years. Interpreting this ratio<br />

(incorrectly) as a guide to future supply potential, suggests that for the non-OPEC<br />

ratio to remain at this level, non-OPEC production must immediately fall. Even<br />

at the global level, supply would need to plateau within this decade. Of course,<br />

however, this calculation ignores future reserves to be added. Taking figures from<br />

Table 3.2, it is evident that using the remaining reserves, including not only proven<br />

reserves, but also those reserves expected to be added in the future, then the global<br />

R/P ratio is 84 years. This ratio can then be used in the estimation of feasible longterm<br />

production profiles.<br />

The R/P ratio is calculated for all countries and regions to develop long-term<br />

production paths, in accordance with observable trends, and consistent with ratios<br />

gradually declining. These declines, however, cannot continue indefinitely. An R/P<br />

ratio of zero implies an infeasible production path; one that suddenly comes to a<br />

standstill. Instead, the rate of decline must taper off and eventually lead to stable R/P<br />

ratios over the long-term. This, in turn, gives rise to long-term production paths that<br />

are feasible, given URR estimates.<br />

Clearly there is no unique R/P path: any number of assumptions can be made.<br />

Nevertheless, within the constraint that downward trends must eventually decelerate<br />

there emerges a clear picture of whether, and where, the resource base acts as a<br />

119<br />

Chapter<br />

3

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