At first glance there may be concern that this approximation is not sufficiently valid for field applications -however, we have shown this relation to be an extraordinarily accurate approximation of the rigorous material balance. This result is suited not only for use as a characteristic model, but also for use as a data analysis mechanism (i.e., this result is used to develop a suite of analysis plots, plotting functions, a type curve, etc.). We note that we also address the case of ω being a linear function of G p , and we note that this result is typically identical (or essentially identical) to the case of ω being assumed to be constant. In this work we provide the following new results:A suite of 6 (six) plotting functions based on the p/z-G p 2 material balance model.A suite of 4 (four) ω-G p performance plots which are used to calibrate analysis.A new type curve in terms of a dimensionless pressure function ( We also use the "Gan" analysis approach (3 (three) specialized plots), where this analysis is based on the observation of 2-straight line trends on a p/z-G p plot for an abnormally pressured reservoir. The Gan analysis is used primarily for orientation, particularly with regard to the 4 new ω-G p performance plots.In order to establish a comprehensive validation of the new method for applications to performance data from abnormally pressured reservoirs, we provide a complete analysis suite for the following cases.4 (four) numerical simulation cases (3 "dry gas" cases, 1 "gas condensate" case).20 (twenty) field cases taken from the petroleum literature, or acquired from industry sources.It is relevant to note that all validation cases have been successfully evaluated using the new methodology and we propose that this new technique will become a standard practice for the analysis of reservoir performance data obtained from abnormally pressured gas reservoirs.