The objective of this paper is to present a methodology for quantification of the impact of uncertainties in the economic evaluation of reservoirs. The methodology is based on the numerical flow simulation of many representative models of possible scenarios of the reservoir, through the combination of the attributes with uncertainty that characterize the reservoir. A set of data representing uncertainty values for each select attribute, and its associated probabilities are combined by the decision tree technique. After the simulation, a statistic treatment is done to obtain the expectation curve of production forecast and net present value. The procedure is done in a network of workstations, using parallel computing, with great reduction in the processing time and ensures the practical usage of this methodology. The methodology is applied to a real offshore field in Campos Basin – Brazil, in the appraisal phase, with few wells and few seismic lines.

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