Geology, geography and global energy

Scientific and Technical Journal


2020. №1, pp. 16-23

Taskinbaev Kosan M. - Atyrau University of Oil and Gas,

Obryadchikov Oleg - Gubkin Russian State University of Oil and Gas,

Gabjanova Bayan Z. - Atyrau University of Oil and Gas,

Nysanova Aigul S. - Atyrau University of Oil and Gas,

Smirnova Tatyana S. - Astrakhan State University,

The high hydrocarbon resource potential in the overwhelming part is confined to the Paleozoic stratum of three basins of Western Kazakhstan, mainly the Caspian basin. This assessment of the state of knowledge of the sedimentary basins of Kazakhstan, along with the obvious wide possibilities for forecasting and discovering new deposits, at the same time indicates that a significant part of the forecast potential is confined to nonstructural objects - nonanticlinal traps. This category of objects, as can be seen, is associated with increased depths and more complex geological conditions of occurrence. It is necessary to actively continue exploratory research on non - anticlinal traps and staging systematic work to study them. The subsalt complex of the Caspian depression has great prospects for oil and gas potential, therefore, the regional features of its structure are considered in the article, as well as the development of various structural forms that have favorable conditions for the formation of oil and gas traps and a number of modifications of non - anticlinal traps are identified as promising objects. The use of new methods of the approach based on paleobatimetric analysis, methods for studying the paleo - depths of the sedimentation basin and paleoreconstructions allowed us to change our understanding of the conditions of sedimentation of the Paleozoic subsalt of the Caspian basin. A more objective picture is given on the internal structure and prospects of oil and gas potential of the onboard and central parts of the Caspian depression. The contours and conditions of the formation of large and medium tectonic elements of the second order are specified. The main factors that were the prerequisites for the formation of non - anticlinal traps in carbonate, terrigenous deposits and “depression” clay - carbonate sediments of the subsalt Paleozoic of the Caspian Depression are considered.

Key words: неантиклинальные ловушки (НАЛ), нефтегазолокализующие структуры, нефтегазоматеринские свиты, Прикаспийская впадина (ПВ), палеобатиметрический анализ, подсолевые отложения, отражающий горизонт (ОГ), ловушки нефти и газа, non-anticlinal traps (NAT), oil and