A method to estimate reservoir properties and predict future performance using production data for naturally fractured reservoirs is presented. The method uses an analytical solution describing dual-porosity reservoirs with constant bottomhole pressure production in both infinite-acting and finite reservoirs. The solution is rigorous for slightly compressible liquid flow, and it is modified using a normalized time to model gas flow in finite reservoirs.

A method is presented for analyzing production data. The method includes procedures for validating the dual-porosity model with production data, determining the suitability of simpler reservoir models, and determining the "best" parameter estimates for the selected model. Example applications using field data from naturally fractured reservoirs are presented.

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