Institute of Oil and Gas, Azerbaijan National Academy of Sciences, Baku, Azerbaijan:

A. B. Gasanov, Professor, Doctor of Physical and Mathematical Sciences, adalathasanov@yahoo.com
V. Sh. Gurbanov, Professor, Doctor of Geological and Mineralogical Sciences

Azerbaijan State Oil and Industry University, Baku, Azerbaijan:
G. G. Abbasova, Researcher

The authors attempt to correlate reservoir properties and occurrence depth of the Mesozoic–Cenozoic oil-and-gas-bearing deposits within the limits of the Absheron uplift. The scope of data generalization embraced the offshore fields Banka Absheron, Western Absheron and Darwin Banka which are the long-term mining projects. The terrigene sediments in the section of the listed deposits include four groups of rocks: clayey siltstone, clayey sandy siltstone, sandy clayey siltstone and shaly sand. The first group (clayey siltstone) is dominated by a pellite fraction of grains 0.175 mm in size. The other two fractions, namely, siltstone composed of grains 0.055 mm in size and fine-grained sand with 0.01 mm size particles, are approximately the same in terms of volume. The latter fraction, which is mediumgrain sand with particles 0.25 mm in size, is small in volume and can be neglected. In the rest three groups, the main fraction is grains 0.055 mm in size, and the fractions with particles having sizes of 0.175 mm and 0.01 mm differ in volumes. The analysis of variation in the grain size ratio in depth shows that the porosity tends to decrease depthwise and is described by the function Y = –0.16X + 12.59 at an average gradient of 0.6% per each 100 m depthward. In the west of the Absheron uplift, the porosity jumps (around 14.2%) with a weaker trend of decrease in depth of the section, or 0.25% per 100 m. The inverse relationship between porosity and carbonate–clayey component in the section is proved in terms of the oilfields Banka Absheron and Western Absheron.

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