STUDY OF FAULT TECTONICS OF PLIOCENIC DEPOSITS OF SOUTH-EASTERN SHIRVANI OF AZERBAIJAN BY SEISMIC SURVEY

The article is devoted to the study of the geological structure of the lower sections of the productive strata of the Lower Pliocene. It consists of an introduction, problem statement, research questions, research methodology, results, conclusion and list of references. The introduction provides basic information about the field under study, its geographical location, the history of geological and geophysical studies, the lithology of the section, the structure of the Kyurovdag fold and the oil and gas potential of the field. It is noted that the oil and gas potential of the Kyurovdag field is associated with the Apsheron stage of the Pleistocene, the Akchagyl stage and the productive stratum (horizons PS01-PS23) of the Neogene, and despite the long development of the field, the lower sections of the productive strata and the underlying deposits have not yet been discovered by deep drilling and due to the complexity of surface , as well as the deep seismogeological structure of these deposits, remained insufficiently studied. 3D seismic surveys have been proposed due to the high level of lateral spurts on the seismic records. The main tasks facing these 3D seismic surveys were to study the geological structure of the Kyurovdag field, to elucidate some of its features hitherto unknown to geologists and geophysicists, as well as to refine the velocity section in order to compile a predictive depth-time dependence for further use. It is indicated that field seismic surveys were carried out by the geophysical company Petroalliance Services Company Limited on the order of Caspian Energy Group. Processing was carried out using the FOCUS processing package version 5.4 from Paradigm geophysical. It is noted that in order to reinterpret the 3D seismic data, CDP-3D materials were obtained for the field and a kinematic analysis was performed for the cubes, which revealed the difference in time shift, frequency spectrum and amplitude range. The cubes were brought to a single form in terms of time, phase and amplitudes, and further kinematic interpretation showed that sufficiently high-quality and conditioned material was obtained for the Kyurovdag area. The studies were carried out using the PANGEA® software package for multi-attribute analysis of geological and geophysical data and standard interpretation. The PETREL.10.2 software package was used for volumetric modeling of the productive formations of the Kurovdag oil field. The objects of study were complex, lithologically and tectonically screened deposits of the productive stratum PS01-PS09 and the Akchagyl stage (AKCH). Deposits of the productive strata belong to the subdivision of the Pliocene division of the Neogene system of the Caspian basin. It is represented by a thick complex of continental and coastal-marine deposits (sands, clays, coarse clastic formations) up to 1600 m thick. It lies unconformably on the deposits of the Pontic stage, overlain transgressively by Akchagyl layers. The Akchagyl Stage is one of the divisions of the Upper Pliocene, the deposits of which are represented by clays, limestones, marls, sandstones, sands, and conglomerates. It was found that the Kurovdag area is characterized by a block structure throughout the studied geological section, and the dimensions of the block also remain almost unchanged, which indicates the correspondence of structural stages and the inheritance of tectonic movements. The development of mud volcanism and diapiric folding, as well as their size, are the main distinguishing features of these maps