The production graphics system (PGS) stores historical oil, water, and gas production data, plots these on a screen, automatically fits exponential and/or hyperbolic decline curves to the data, allows the user to alter these curves interactively, and allows transfer of the resulting decline curve information to the property record data base of the forecasting and evaluation system (FES).

The FES maintains a lease or well data base, and uses information on producing rates and prices to calculate before-tax and after-tax economics for oil and gas properties. Both PGS and FES are managed by a color-enhanced, screen-oriented facility, for entering and reviewing pertinent data.

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