Geofluid dynamic features of oil and gas accumulation in the southwestern part of the Caspian depression

Background. The article considers the features of the geofluid dynamic regime of subsalt sediments of the southwestern part of the Caspian depression. Objective. To refine the understanding of geofluid dynamic conditions of oil and gas accumulation within the southwestern part of the Caspian depression. Object of study. Hydrocarbon fields and areas located in the subsalt level of the southwestern part of the Caspian depression. Materials and methods. Comparative analysis of reservoir temperature and pressure data and the results of well sampling and chemical analyses of water and water-dissolved gases. Results. We substantiated the development of three different types of water-drive regimes – infiltration, elision, stagnation – determining the formation of hydrocarbon systems of different types (flowing and autoclave). Conclusions. Accounting of geofluid dynamic conditions of oil and gas accumulation can significantly clarify the position of potentially productive zones when searching for commercially significant accumulations of oil and gas.