Regularities of Lithofacial Variation of Productive Series Sediments of South Caspian Basin

In the last hydrocarbon exploration has intensified in the offshore part of the South-Caspian Basin (SCB). New data allowed detailing regional distribution of reservoir beds and facies change of the Productive Series. Regional patterns of change in reservoir and lithofacial properties of the Productive Series (PS) deposits of SCB have been studied on over 1000 rock samples from 40 wells, as well as on 25 thin sections. Determination of lithological and reservoir properties of rocks allowed drawing a series of maps reflecting regional variation of the parameters. In addition, 5 lithofacial zones encompassing the upper and lower divisions of the PS (except for the Baku Archipelago). Facies of the PS lower division have been found to differ from those of the upper division in that south-westerly silty-clayey fraction exhibits substantial increase and carbonate content of rocks increases slightly.