PRE-JURASSIC STAGE OF DEVELOPMENT AND PROSPECTS OF OIL AND GAS POTENTIAL NORTHERN USTYURT
Azhgaliev D.K. Nursultanova S.N.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#2023Issue 620 - 36 pp.
The article presents the regional structural-tectonic and geological-geophysical features of the structure of the Northern Ustyurt region in the western part of the Turan plate. Given the state of the study and the main stages of the development of the region, as well as new data and results obtained on individual local areas in recent years. The aim of the work is to clarify the geological and tectonic features of the structure and composition of sediments at the pre-Jurassic stage of the regions development in connection with the assessment of oil and gas potential. Taking into account the results of the analysis and generalization of the available materials, an assessment of the methodological approaches that were at the heart of all previous stages of the study is given. The views on the regional tectonics of the region, which were insufficiently perfect due to the use of the geographical principle of zoning and the allocation of the Western-Aral and Eastern-Aral parts in the territory under consideration, are taken into account. An assessment of the geostructural position of the Aral-Kyzylkum dislocation system is given. On the example of the structural elements of the Shalkar trough, the views on the model of the structure of the Koshkaratinsky and Tobebulak mulda are claryfied. In accordance with this, an assumption is made about the development of elementary zones of oil and gas accumulation, which are widespread within the North-Ustyurt system of deflections and uplifts. At the same time, the results of combining data from exploratory drilling, seismic exploration, anomalies of potential physical fields, trends and strike elements of fault tectonics are taken into account. The features of the structural plan and the nature of the manifestation of oil and gas potential in the context of large deflections and uplifts (Bozashinskiy and Aktumsyk uplift, Koltyk-Kulazhatskiy, Barsakelmesskiy, Sudochiy and Shalkar deflections, Arystanovskaya and Mynsualmassky stage) are clarified. The regularities in the areal distribution of oil and gas accumulations of a certain phase composition of hydrocarbons are highlighted. The areal distribution of prospective local objects is determined by the influence of regional features of the region, including the proximity of local structures to the routes of regional faults, the presence of large inherited uplifts in the context of the Pre-Jurassic complex. The main results of the study are the substantiation of the high prospects of Paleozoic deposits, the development of which influenced the formation of transitional anticlinal zones (shaft-like uplifts), large uplifts (shafts) within regional deflections and projections (foundation, Paleozoic) between adjacent deflections. Substantiated recommendations for expanding the range of prospective local oil and gas traps in the context of the Pre–Jurassic complex associated with large Paleozoic uplifts of massive consedimentary type. Clarified the directions of search operations in the context of the deposits of the Pre-Jurassic complex (Paleozoic), structural complications representing delays on the monoclines of the sides, slopes of deflections and protrusions of bedrock are of search interest.
complex , hydrocarbons , oil and gas content , oil and gas trap , Paleozoic , structure
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NAO «Atyrau University of Oil and Gas named after Safi Utebayev», Atyrau, Kazakhstan
NAO «Atyrau University of Oil and Gas named after Safi Utebayev»
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