Recently, new gas condensate fields have been discovered in remote areas of the Amazonian rainforest, Peru. Some of these fields tested gas and condensate from Nia, Noi and Ene reservoirs; Accuracy in well testing interpretation will play a crucial role in identifying geological features and solving uncertainties while characterizing these fields. Conventional interpretation methods are not completely rigorous while trying to match pressure transient behavior by semi-log pseudo-pressure and derivative plots; usually, condensate banking phenomena and complex geological features are not precisely described with inferred models, especially in relatively new fields with little information. An integrated approach composed by the combination of numerical simulation plus deconvolution technique offers comparative advantages compared to conventional transient testing analysis when discriminating between potential interpretation models and a sound reservoir characterization; contribution of geology and geophysics is very critical to identify structural features such as faults, flow barriers and fluid-contact positions, as well as, to predict pressure support intensity and predominant drive mechanism. This paper provides general guidelines to integrate reservoir modeling disciplines to numerical deconvolution analysis so as to precise well testing interpretation of fields in early development phases; some applications, such as a sound methodology to calculate a representative drainage radius for the whole drawdown time, and its contribution to mitigate uncertainty in resources estimation, as well as, a more detailed characterization of late-time effects (facies-changes and fluid-contacts) in Peruvian gas condensate fields were emphasized. Copyright 2010, Society of Petroleum Engineers.