The forecast of perspective oil and gas objects in the Paleozoic within the South Mangyshlak flexure in the west of the Turan plate

Dulat Kalimovich Azhgaliev

D. K. Azhgaliev / News of the Ural State Mining University 1 (2018) 11–17 DOI 10.21440/2307-2091-2018-1-11-17

The urgency of the problem. The study of the Paleozoic deposits becomes relevant. It is connected with the discovery of hydrocarbons with industrial conditions in some of the areas in the Western part of the Turan plate. New concepts of the favorable conditions of deposition indicate that the formation of the large areas of probable hydrocarbon accumulations may occur. The South Mangyshlak flexure occupies the Central part of the Mangyshlak basin in the Western part of the Turan plate. In this respect, it is highly interesting from the reconnaissance point of view.

The purpose of the article is to substantiate the prospects of the Paleozoic sediments deposited at higher depths (4.5 to 5.0 km). The results of the regional peculiarities of the tectonic structure assessment should be taken into account. In this assessment, we used analysis and generalization of the new data which were obtained in recent years and a comparative analysis of major elements (areas). These generalizations and analysis reckon with the nature of the relationship of structural plans of the surface of the basement and the Paleozoic complex.

Results. The peculiarities of the tectonic structure of the Paleozoic sediments in the context of the South Mangyshlak flexure (Western part of the Turan plate) have been considered. The details of the study and the new data on the development of Paleozoic sediments at higher depths (4.5 to 5.0 km) have also been provided. A large-scale regional Project called “Integrated study of sedimentary basins of the Republic of Kazakhstan” was held from 2009 to 2013. According to its results, a more precise characterization of the main tectonic elements of the territory on the Paleozoic complex was given. The inferred resources and potential of these sediments were highly evaluated. The subsequent implementation of the recommendations has been supplied earlier in a search operation on the results of comprehensive data analysis of 2D and 3D seismic acquisition (2013). Along the lines of this implementation, high possibility of the reprocessing of geological and seismic materials was shown. They were made in the area to the North and South of the pot of the Uzen'–Karamandybas (contract of the prospecting block called Uzen'). A major Paleozoic uplift (the area of the Uzen'–Karamandybas– Tenhe) was provisionally allocated; the more “hard peg” seismic horizons were taken into account. The overall spatial characteristics and the algorithm of further actions were justified.

Summary. Based on the results obtained, the factors and favorable conditions to continue the purposeful studies of the Paleozoic sediments are defined concretely. The structural-tectonic conditions are highlighted. Among them, we can point out trends and the influence of the fault tectonics, inherited the development of critical structural elements. Common patterns of structural plan for the top of the basement and Paleozoic are also among them. These conditions cause the formation of traps and the formation of the promising sites. The four sites have been highlighted. The data received indicates that the Paleozoic sediments possess a high oil-and-gas potential. (Zhetybai-Uzen' step, the SouthEastern part of Ustyurt Bozashi area Peshchanaya and Shell uplift and block Kurmangazy in the Northern Caspian).

Keywords: hydrocarbons; area highs; fault; Paleozoic; sedimentary basin; South-East Ustyurt Bozashi; Mangyshlak; structure; petroleum potential; reflecting horizon; seismic studies.

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