Percentage of expected maximum recovered hydrocarbon reserves $\begin{array}{l}Q_{HC, \, \rm max}\end{array}$ from the Surface Tank Hydrocarbon Initial In Place (STHCIIP) from a Petroleum Reservoir by the end of its producing life:

(1)	$\begin{array}{l}\displaystyle \rm EUR = \frac{Q_{HC, \, \rm max}}{V_{STHCIIP}}\end{array}$

The Estimated Ultimate Recovery may be further split into:

Estimated Ultimate Oil Recovery (EUOR)	Estimated Ultimate Gas Recovery (EUGR)

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