Oil & Gas Reserves

(1) KNU Definition

This KNU represents the known reserves in 2010, for the current extraction price.

The value for Oil and Natural gas has changed considerably since 2005.  To compute the estimate in 2010, we use the best forecast in 2026, to which we add the known consumption from 2010 to 2025.  When we look  at fossil fuels reserves (Oil, Gas and Coal), we  separate between known reserves (what we know to exist in 2026) and forecast (future amount to be discovered, which is really unknown). The default hypothesesis is a mean of theses two, and a slider in G2WS allows to test a minimum hypothesis (proven) and maxiumal (proven + forecast).

(2) What the slider in  G2WS does ?

The slider simply increases the linear curves that define the KNU (see illustration below), through the multiplication by a constant factor. The sensibilily of the slider is adjusted so that the minimum correspond to the "proven" reserves, while the maximum is he amount in the chart below.

The Knu keeps the same shape, that of a piecewise linear function that expressed the available reserves as a function of price.

When you change the slider, the control KPI is the sum Oil and Gas reserves, as seen in 2010 and expressed in PWh (1 toe  = 11.6 PWh)

(3) References

You may also ask your favorite LLM (such as Opus 4.5 or GPT 5.2) to make your opinion.

References to web data sources may be found in this page.