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This paper investigates the genesis of the Productive Series sediments within the uplift zone of Pirallahi Island, focusing on the distribution conditions and lithofacies characteristics of different origins. For this purpose, the lithofacies characteristics and conditions of the Lower Pliocene Productive Series sediments in the Pirallahi Island structure have been analyzed, particularly based on geophysical well logging (GWL) data. Using a significant number of well logging diagrams, the distribution of sand and shale lithologies for the productive horizons were determined, systematically classified, and correlation schemes were established. The research includes a detailed analysis of the sedimentary environments to interpret depositional patterns, integrating GWL data with lithological core analyses where available. The facies analysis on Pirallahi Island has included nearly all the boreholes drilled in the field, with the distribution of facies considered from top to bottom across the study area. In addition, the study includes a quantitative assessment of porosity, permeability and clay content to comprehensively evaluate the reservoir potential. Well log analysis allowed interpretation of the effective porosity of the rocks and their shale content, providing a clearer understanding of reservoir heterogeneity. The main objective of the study reported in this paper is to demonstrate lithofacies variability in both horizontal and vertical directions using cross section and lithofacies modeling techniques. The developed facies model is thus demonstrated on a number of surfaces, providing a predictive framework for identifying favorable reservoir zones. The resulting regularities are discussed, highlighting the implications of facies variability for hydrocarbon exploration and production strategies.

The type of tectonic faults plays an important role in issues such as migration and accumulation of hydrocarbons, formation of traps, determination of the direction of prospecting and exploration works, preparation of development projects, etc. For this reason, determining the characteristics type of tectonic faults in the exploration, development and exploitation of oil-gas fields is one of the main problems. There have been a number of approaches communicated both internationally and in local Azerbaijani publications. Juxtaposition diagrams, which are drawn up by taking into account the spatial position of faults and lithological characteristics of the surrounding sediments, are widely used in the search for fault-related traps and in the separation or integration of production objects in fields. It is also possible to determine the amount of shale material entering the fault gouge with these graphs. Considering that the Darvin Bank field is complicated by tectonic faults, the juxtaposition diagrams proposed by Knipe R. J. were used to determine the connection between the tectonic blocks. According to Upper Kirmaki Suite (KSupper) horizon, the faults numbered 11 and 3a in the northwest part of the field are permeable, while faults numbered 3, 6, and 7 are classified as non-permeable. The reliability of the results has been confirmed by the results of Cluster analysis applied in previous studies, and the application of this method in other oil and gas fields of Azerbaijan has been suggested.

This article is devoted to the compilation of classification model according to the complication characteristics of anticlinal structures present at SCB. Besides the number of tectonic blocks, deposition depth of structure has also been taken into consideration when defining the complication extent of structures. Structures have been classified depending on the sea depth and complication map for the Azerbaijan sector of the Basin has been compiled for the very first time. This map can be utilized as a tool to justify the sequential exploration activities.

By analyse results of complex of geological-geophysical and geochemical studying of kura and gabirri interfluves it was revealed that, oil-gas source rock of maykop deposits was subsided in different: continental, deltaic, shallow and deep marine conditions. Organic matter substance in crossection of this deposits changes between from 0.02 to 2.14%. Geothermic gradient of upper part of maykop deposits, shows on low maturity level of organic matter on the studied region. Despite of it, conducted studies shows that, in low part of maykop deposits and Eocene deposits there are subsiding probability of shale HC. By the study results it is possible to come to conclusion that, deposits of the 3000-5000 m depth interval, passed the main oil-gaz formation window. At the same time low permeability and fracturing of Eocene and maykop deposits positively influenced on subsiding and preservation processes of shale HC.

Thickness analysis shows that the Lower Eocene sandy horizons are distributed locally in Tovuz-Gazagh, GiragKasaman and Mammadtapa areas, and have lens-shaped morphology. This creates conditions favorable for lithological traps formation. In some areas, tuff reservoirs of the Middle Eocene age are onlapping on the local uplifts. Possability of lithological traps formation in suchareas is high. On the west part of northern zone of Kur and Gabyrry interfluve the well-sorted tuff-terrigenous rocks are predominating. It is supposed that sediments along the north - northeast border of the area will be similar to those in near Tbilisi area, and consist of fine-grained tuff-terrigenous rocks with interlayers of shale and marl. From the similar reservoirs of the Middle Eocene the oil is produced in Tarsdallar and Gurzundagh areas of Kur and Gabyrry oil-gas region.

The article is devoted to such an urgent task as determining th e geological and field parameters for estimating the hydrocarbon reserves of the Umid-Babek prospective structure. Therefore, the geological and field parameters dependence of the fields located in anticlinal line investigated. Base on results was possible to estimate more reliably hydrocarbon reserves, to make plan exploration in the right direction and to design a development plan.

Tectonic features of Miocene sediments in South-West Apsheron formed as a result of a interaction between Submeridional and Common Caucasian folding movements. Meridional and circular folding predominates in South-West Apsheron. The forming of circular folding is a result of weakening intensity of Common Caucasian folding and cosedimentation development submeridonal folding simultaneously. The local structures of the West Apsheron in many cases occur by the diaper structures, which are complicated by the mud volcanoes. The forming these kind of structures related with big thickness Paleogene-Miocene plastic shales and intensities of folding movements.

In recent years the main volume of explorative drilling and the seismic exploration, executed in the territory of Azerbaijan, was concentrated within the Yevlakh-Agdzhabedy depression. On this basis a comprehensive study of results of deep drilling and seismic exploration of the geological structure and oil and gas bearing of different tectonic zones in the areas both on its southwest boarder, and on the northeast has been performed. It has been determined that from the point of view of oil and gas the northeast boarder of the depression is considered more prospective, than its southwest boarder. On the northeast boarder oil and gas are present in the deeper horizons of the Upper Cretaceous as well as the Paleogene and Miocene formations. Oil accumulations are indicated within several structures (Muradkhanly, Zardob, Shykhbagi and Dzhafarli) of Zardob-Muradkhanly-Dzhafarli,a tectonic zone connected, generally with fractured effusive and carbonate rocks of the Upper Cretaceous. Also sedimentary rocks of middle Eocen and partially, terrigenny collectors of Maikop and Chockrac deposits. All oil pools are dated to lithology and structural traps. The foregoing indicates the existence of favorable geological conditions on the northeast boarder of this depression for reservoirs of meso-cenozoic deposits containing commercial fields of oil and gas.

The big practical interest, from the point of view petrol prospects of Mesozoic deposits, which are widely developed in depression zones of Azerbaijan, represent and are one of main directions of exploration. For explore of petrol potential possibilities of Mesozoic deposits of republic the complex analysis of geological-geochemical conditions of accumulation of these deposits with the account paleotectonic developments of their sedimation basins is carried out. It is established that these basins tested long time and steady immersing with accumulation of powerful thickness of sedimentary rocks under favorable geological-geochemical conditions. The most perspective structures and stratiqraphic complex of Mesozoi, in which sections are, noted sandli and carbonate reservoirs with good collector properties and the impermoable rock covers over them.

The article is devoted to improving the representation of the geological structure of Garadagh area on V, VIIa, VIII horizons, Underkirmaky suite Productive strata and II horizon of Miocene deposits. This is achieved using seismic data from 2D and 3D surveys, exploratory drilling and analysis of test results of exploratory and development wells identifying the key areas of exploration. Some additional faults (with throw of 100-150 m) were established on the northern flank and in the eastern part of south wing on the structural maps of these horizons, along with faults defined by 3D seismic surveys. The central tectonic block of the south wing is lowered stepwise in relation to periclinal parts of the folds. Given that the pools of oil and condensate on the southern flank are shielded by axial and diagonal faults, the most wide area of development are pools of VII and VIIa horizons, and the lowest V horizon Productive strata. In the western part of the southern wing the reservoir properties of VIII, VII and VIIa horizons are poorer. Here, small accumulations of oil and condensate, along with faults with southeastern direction are screened by the faults with northeastern directions. VIII, VIIa and VII horizons are distinguished only in the eastern part of the north wing and in central and western parts of this wing these horizons wedge and shale out. In the western part of the north wing, the number and thickness of the sandy horizons of Diatom deposits increases towards the Chuvaldag trough on the north, but in the eastern part of the north wing in periclinal parts of the North Garadagh uplift these horizons shale and wedge out. Sandy horizons of the Sarmatian stage, Chokrakian, Konkian and Karaganian horizons on the north wing are promising targets for prospects for new oil pools. VIII, VIIa and VII horizons of Productive strata within the southern wing and in the eastern periclinal parts of the northern wing are the subject of explaration to find new pools and delineate existing discoved oil pools.