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GEOLOGICAL AND PHYSICAL FEATURES OF THE FORMATION AND DEVELOPMENT OF OIL RESERVES OF DEPOSITS COMPLICATED BY FAULTING

One of the most important criteria by which it is customary to classify a field as complex is the presence of discontinuous tectonics. The influence of tectonic disturbances on oil accumulation, on the reservoir properties of the reservoir is recognized and is significant. In the Jurassic deposits of Western Siberia, as a result of tectonic-magmatic activation, both deep and low-amplitude discontinuous disturbances are traced. The development of deposits complicated by disjunctive disturbances requires a comprehensive analysis of the geological structure. The study of reservoir rocks, void space, filtration processes in zones of influence of tectonic disturbances, facies features, as well as the current state of development, patterns of local distribution of residual oil reserves and the possibility of their involvement in development are some of the most important tasks. Particular attention is focused on determining the permeability of faults, which determine the effectiveness of the development of tectonically disturbed deposits. When solving the problem of assessing the permeability of faults, several interrelated directions can be distinguished - these are indicator studies, hydrodynamic studies, and statistical correlation analysis. Areas isolated by tectonics with residual oil reserves should be considered as separate development blocks. With the block structure of the fields, the following features can be distinguished: the position of the oil-water contact with different hypsometric marks on the adjacent blocks of the reservoir, a significant difference in the values of reservoir pressures, effective thickness of the reservoir and filtration-reservoir properties of the reservoir. With such a structure, the technology of non-stationary (cyclic/pulse) impact on the formation inside the development block is used. The displacement of oil from the pore matrix of the reservoir occurs due to the redistribution of the pressure gradient created by shutting down production and injection wells.