Traditionally, Pressure Transient Analysis (PTA) has been performed following a deterministic agenda. However, parameters used to quantify permeability and reservoir geometry might be plagued with uncertainty, unavailable or utterly unreliable. Given a set of uncertain rock and fluid data modeled as probability density functions (PDFs), this paper shows that by preserving two quantities in the log-log pressure-derivative domain, one can promptly build permeability and reservoir dimensions PDFs consistent with the well-test pressure history.

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