The paper presents features in determination of reservoir filtration system model of carbonate oil fields using dynamic well tests analysis. It is shown that pressure build-up is characterized by long-term wellbore storage covering over informative part of log-log plot. Authors suggest using drillstem test results to determine filtration model, for R.Trebs field it has determined as dual porosity model. Based on the drillstem test analysis storativity ratio and interporosity ratio for the Lower Devonian Ovinparma formation (D1op1) were calculated. Drillstem tests showed high informativity for reservoir filtration system model determination.
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