Uncertainties in basic petrophysical parameters in shale gas reservoirs are discussed in this paper. These parameters include porosity, permeability, gas adsorption, water saturation and TOC. Current available methods to evaluate shale gas petrophysical properties are summarized. These methods include core laboratory measurements and well logs. Sources of uncertainty in these measurements are discussed.

Uncertainty analysis using commercial simulation software was performed to understand how these uncertainties influence reservoir simulation results and predictions. Sensitivity and uncertainty studies in this paper are based on typical ranges of shale gas properties extracted from published evaluation reports or open data. Results from this study will help guide the focus of future research and technology development for shale gas reservoirs.

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