Estimated ultimate recovery or Expected ultimate recovery (EUR) of a resource is the sum of the

proven reserves Proven reserves (also called measured reserves, 1P, and reserves) is a measure of fossil fuel energy reserves, such as oil reserves, natural gas reserves, and coal reserves. It is defined as the " antity of energy sources estimated with reasona ...

at a specific time and the cumulative production up to that point.

References

Petroleum production Petroleum economics {{petroleum-stub