Perm Journal of Petroleum and Mining Engineering (Nov 2018)
Modeling the structure and formation of the oil and gas potential of Riphean-Vendian deposits that belong to north-east regions of the Volga-Ural oil and gas province
Abstract
The paper is devoted to the urgent problem of studying the prospects of the oil and gas potential of Riphean-Vendian sediments of poorly studied areas such as northeastern regions of the Volga-Ural oil and gas province. The paper presents the characteristic of the lithological and stratigraphic features of the structure of Riphean and Vendian deposits in the northeastern part of the Volga-Ural oil and gas province. Particular attention is paid to the basin modeling of well sections that did not fully passed through the Riphean-Vendian complex of rocks.That allows to predict oil and gas generation processes. During the research sections of three wells were modelled. Wells Keltmenskaya-1, Krasnovisherskaya-18, Borovitskaya-624 revealed Upper Proterozoic rocks in the north-east of the Perm region and the Komi Republic. Procedure features of the used software systems, phasing of the research, including gathering and input of initial data, processing of parameters, calculation and calibration of models are given. Certain challenges associated with modeling the conditions of oil and gas formation and oil and gas accumulation of Riphean and Vendian sediments of this territory are associated with insufficient information on the structure and composition of sediments, incomplete drilling of ancient sediments in wells and inconsistent geophysical data. In addition, the complexity of the reconstruction lies in the lack of information about geothermal conditions of sections, numerous interruptions in sedimentation and erosion of sediments. According to simulation results, most of the Riphean-Vendian sedimentary section is located in the main zone of oil generation. The research conducted allowed the authors to conclude that there are increased prospects to discover oil hydrocarbons in a wide range of depths in the areas where the Krasnovisherskaya-18 and Borovitskaya-624 wells are drilled. There is a little likelihood that gaseous hydrocarbons can be found in the section. Conducted research and obtained results pose a problem for the development of geological exploration in the poorly studied areas of the northeast of the Volga-Ural oil and gas province. First of all, that corresponds to reference-parametric drilling together with the zonal-regional geophysical studies.
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