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→Production history analysis
| Life of reservoir || <math>t = \left( \frac{1}{D} \right) \ln \left( \frac{q_{\text{i}}}{q_{ec}} \right)</math> || <math>t = \left( \frac{q_{\rm i}}{q_{\rm ec}} \right)^n -\frac{1}{nD_{\rm i}}</math>
| Life of reservoir || <math>t = \left( \frac{1}{D} \right) \ln \left( \frac{q_{\text{i}}}{q_{ec}} \right)</math> || <math>t = \left( \frac{q_{\rm i}}{q_{\rm ec}} \right)^n -\frac{1}{nD_{\rm i}}</math>
|}
|}
<sup>where</sup><br>
:<sup>q<sub>t</sub> = Rate of production at time t (BOPD).</sup><br>
:<sup>q<sub>i</sub> = Rate of initial production (BOPD).</sup><br>
<sup>q<sub>ec</sub> = Economic limit rate of production (BOPD).</sup><br>
:<sup>D = Decine rate (decimal).</sup><br>
<sup>D<sub>i</sub> = Initial decline rate (decimal).</sup><br>
:<sup>t= Time (years).</sup><br>
:<sup>n = Exponent usually between 0 and 0.7.</sup><br>
<sup>N<sub>p</sub> = Cumulative production (STBO).
==Analogy method==
==Analogy method==