Study of the dynamics of gas extraction depending on open porosity of rocks-reservoirs which are formed in different geological conditions of sedimentation indicates the three distinct modes of extracting gas: initial, where βh varies from 0 to 0.5, transition – βh=0,5-0,7 (for sarmatian collectors of Bilche-Volytsky zone of the Carpathian foredeep), βh=0.5-0.8 (for Visean collectors of Rudivsko-Chervonozavodsky deposits in the Dnieper-Donets basin) and βh=0.5-0.6 (for Miocene carbonate reservoirs of southern waters of Azov sea). At the final stage the gas extraction coefficient is independent of porosity (monotonically increased in 2–3 %).
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