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Baku archipelago is well-known for high oil and gas production even at the great depth due to high sedimentation rate and low compaction during the formation of basin. This paper represent the Garnulomtric analysis of core samples, in which grain size fractions are determined along with porosity of the cores. Four types of rock groups (clayey-aleuritic sand, clayey-sandy aleurolites, sandy-clayey aleurolites and clayey sandy loams) were taken into account. In first group (clayey-aleuritic sand) the dominant grain size fraction is 0.175 mm which lead to increase in porosity, in second group the dominant fractions are 0.055 mm and 0.175 which tend to increase in porosity. In clayey-sandy aleurolites fractions like 0.055 mm and 0.25 mm have negative effect on porosity. Moreover, in clayey-sandy loam deposits, the coarser grains have positive impact on porosity compared to fine grains. On the basis of results obtained, the central part of Baku Archipelago is very promising for oil and gas potential especially the anticlinal zone of Gamamdag, Deniz, Sabail and Nakhchivan.Furthermore, accidents and complications in the drilling process may occur due to incorrect predictions of reservoir and hydrostatic pressure during the exploration process, that’s why, it is highly advisable to take into account this anomalous phenomena when choosing the location of wells.

FACTORS PROVING THE OIL AND GAS POTENTIAL OF TERRIGENOUS RESERVOIRS AT GREAT DEPTHS IN THE BAKU ARCHIPELAGO