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The production potential of a petroleum reservoir depends on rock parameters, such as petrophysical ones that must be analyzed before establishing a new location. For years some methods have been applied to define minimum and maximum petrophysical values and therefore to assure production from an oil field. The current research investigates a process commonly used in the oil industry that defines the boundary values of the rock and fluid parameters to assess the economic viability in an area. The process includes cut-off parameters, which are defined by the minimum resistivity for field production, maximum water saturation, irreducible water saturation, maximum clay content and minimum porosity. Once these parameters are defined through cross-plots, they are compared with measured values in the area; if some value is out of the calculated minimum or maximum limits, it will imply in considerable risk to the new location. [ABSTRACT FROM AUTHOR]