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The paper presents investigations of rate-decline analysis and its feasibility in the assessment of gas resources discovered in Polish shale formations. The investigation uses both oneand two-phase simulation models constructed and calibrated for typical shale formations discovered and tested by Polish operators. Various types of rate-decline curves are investigated. Expected uncertainties of gas resources estimated by the rate-decline curves are found depending on the available production data period for various geological parameters and gas production mechanisms. General conclusions are drawn from the results of the analysis for the practical usage of rate decline curves in the process of the resource estimates of Polish shale gas formations.

Investigation of Rate-Decline Analysis for Assessment of Recoverable Resources of Polish Shale Gas Formations