DEPOSITIONAL CONDITIONS AND PETROPHYSICAL CHARACTERISTICS OF THE PRODUCTIVE SERIES IN THE NEFT DASHLARY AREA

The study of the petrophysical characteristics of sedimentary deposits is an important tool for reconstructing depositional environments and paleogeographic settings. Parameters such as porosity, permeability, density, water and hydrocarbon saturation, as well as electrical and elastic properties reflect both primary sedimentary features and the influence of post-sedimentary processes. The analysis of these data makes it possible to distinguish lithofacies types, assess the spatial variability of reservoir and sealing strata, and improve the reliability of stratigraphic correlation. The facies method used in paleogeographic analysis helps to identify hydrocarbon-bearing reservoir rocks and productive horizons, thereby refining patterns of rock distribution and depositional environments. The aim of this article is to conduct a comprehensive analysis of the petrophysical and lithofacies characteristics of the Productive Seriesin the Neft Dashlary area in order to reconstruct depositional conditions and clarify the patterns of reservoir rock formation. The reconstruction was carried out based on the analysis of well-logging data using the Emery method and cyclostratigraphic analysis. The results show that hydrocarbon accumulations are associated with deposits of the Fasila Suite (FS), the Lower Kirmaky Suite (LK), and the Kirmaky Suite (KS) of the Productive Series. The study revealed that the formation and accumulation of hydrocarbons occurred during progradational, retrogradational, and aggradational stages. The reservoir properties of deposits belonging to the Balakhany Suite horizons (VII, VIIa, and X) and the Fasila, Upper Kirmaky Clay (UKCa), Upper Kirmaky Sandy (UKS), Kirmaky (KS-2), Lower Kirmaky (LK-1, LK-2 upper, LK-2 lower), and Qala (QaS) Suites of the Productive Series were analyzed. In addition, regression analysis was performed to determine the correlation relationships between the main petrophysical parameters of these deposits.