Hydrocarbon systems of the Pre-Ural fore deep and exploration prospects of the oil and gas accumulations

UDK: 550.8

DOI: 10.24887/0028-2448-2017-4-36-40

Key words: Pre-Ural fore deep, oil and gas occurrence, oil-and-gas source rocks, generation potential, modeling

Authors: V.Yu. Kerimov, A.V. Osipov, A.S. Nefedova (Gubkin Russian State University of Oil and Gas (National Research University), RF, Moscow)

The article shows the results of four studies of petroleum systems in eastern side of the Ural deflection within the Orenburg region: Lower Devonian, Frasnian, Frasnian-Tournaisian, Visean-Bashkir and Lower Permian. The characteristic elements (oil and gas source rocks, reservoir rocks and confining beds) and are described in terms of the formation of each hydrocarbon system. To evaluate the hydrocarbon potential of the eastern side of the Ural deflection applied numerical basin modeling technology, resulting in a constructed three-dimensional geological model of the object. Carried out work allowed to make productivity calculations of oil and gas and maternal sequences of each system and create a predictive model of oil and gas potential of the eastern side of the Ural deflection. According to the results of the research it determined that the ratio of the time of formation of oil and gas traps and generation time, migration and accumulation of hydrocarbons may be acceptable for all the studied petroleum systems. The regions of most intense hydrocarbon generation: the generation of centers for all studied the petroleum systems are the southern part of Belsky depression and the northern part of the Caspian syncline. The ways of migration and areas of most likely hydrocarbon-accumulation are defined. For each hydrocarbon system ranging of the study area in terms of oil and gas potential is made and promising areas of geological exploration for oil and gas are identified. The most promising areas within the study area are the southern part of the basin and the northern Bielsko-board part of the Caspian syncline, where accumulations of hydrocarbons are forecast in all four petroleum systems. Within the northern part of the main prospects are associated with Lower Devonian, Frasnian, Frasnian-Tournaisian, and Visean-Bashkir petroleum systems. Prospects of Lower Permian hydrocarbon systems are significantly reduced due to the high risk of unfilled traps most of the territory.

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