Sensitivity Calculations

The output values that are obtained come directly from the analytical model. The analytical model calculates both OGIP / OOIP and EUR for each specified limit, setting every other parameter equal to their baseline. For example, if the lower limit of k1 is specified, this lower limit is entered into the analytical model, along with the baseline values of the remaining parameters. The model calculates the outputs, which are displayed on the sensitivity worksheet.

The Average Error output describes the percent difference from the actual production history. The Ack1/2 output is calculated using the formulas below:

And k = k1 (inner zone permeability)

For more information, see Sensitivity Theory.