Many types of digital information are available commercially for use by the petroleum industry. Two particularly useful types of data are production history and reservoir information. Computer files of production history information typically contain monthly production figures and periodic test results where they are available. Computer files of reservoir information commonly include such data as producing formation, discovery date, average depth, net pay, porosity, permeability, lithology, trap type, fluid contacts, drive type, and chemical analyses of crude oil, gas, and formation-water samples.

It is often difficult to assimilate these large volumes of information by merely listing the data. Computer-generated production decline curves, P/Z gas plots, maps, bar graphs, and other such graphic displays allow one to analyze these data with less time and effort.

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