Percentage of total hydrocarbon reserves recovered by a given time moment $\begin{array}{l}t\end{array}$ :

(1)	$\begin{array}{l}\displaystyle {\rm RF}(t) = \frac{{ \rm V_{recovered \ reserves}}(t)}{{\rm V_{total \ reserves}}}\end{array}$

It always ranges $\begin{array}{l}0 \leq {\rm RF}(t) \leq {\rm EUR} \leq 100 \%\end{array}$ and is related to Depletion Factor (DF) as:

(2)	$\begin{array}{l}\displaystyle {\rm RF} (t) = {\rm EUR} \cdot {\rm DF}(t)\end{array}$

The Oil Recovery Factor (RFO) is defined as ratio of cumulative oil production $\begin{array}{l}Q^{\uparrow}_O\end{array}$ to STOIIP $\begin{array}{l}V_{\rm STOIIP}\end{array}$ :

(3)	$\begin{array}{l}\displaystyle {\rm RFO} = \frac{Q^{\uparrow}_O}{V_{\rm STOIIP}}\end{array}$

The Gas Recovery Factor (RFG) is defined as ratio of cumulative gas production $\begin{array}{l}Q^{\uparrow}_G\end{array}$ to STGIIP:

(4)	$\begin{array}{l}\displaystyle {\rm RFG} = \frac{Q^{\uparrow}_G}{V_{\rm STGIIP}}\end{array}$

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