[1][2] Before the availability of computers, decline curve analysis was performed by hand on semi-log plot paper.
Oil and gas wells usually reach their maximum output shortly after completion.
By the aid of this knowledge the value of a property may be judged, and proper depletion and depreciation charges may be made on the books of the operating company.
Decline curves are the most common means of forecasting oil and gas production.
Decline curves are also one of the oldest methods of predicting oil reserves.