Review of data on the composition of the subsalt sedimentary sections of the Pre-Caspian basin
Boldireva A.I. Kuandykov B.M. Eskozha B.A. Kuantaev N.E. Khafizov S.F. Dantsova K.I.
2024Neftyanoe Khozyaistvo
Neftyanoe Khozyaystvo - Oil Industry
2024#2024Issue 116 - 23 pp.
The work examines the main patterns of the structure of the subsalt section of the Pre-Caspian Data on the structure of each of the sides of the depression was collected and updated, and the stratigraphic reference of the sediments was clarified, taking into account modern knowledge about the existing stratigraphic scheme of the region. Based on the analysis of numerous published and archival stock materials, schematic lithological-stratigraphic columns were constructed for the northwestern, northern, eastern, southern side zones of the depression and the zone of the Astrakhan carbonate massif, which reflect the main patterns of the structure of the sections of the given zones, and also mark their reflecting seismic horizons. Areas with active carbonate accumulation are identified, which occurred in stages during the time interval from the Middle-Late Devonian to the Early Permian. At the same time, the earliest carbonates are identified on the northwestern, northern and eastern sides of the depression and on the Astrakhan massif. Within the southern marginal zone, excluding the Tengiz-Kashagan subzone, until the end of the Early Carboniferous, terrigenous sedimentation prevailed. Moreover, predominantly terrigenous sediments accumulated within a limited area of the Matken-Ushmola subzone in the south of the basin. The varying degrees of knowledge, existing disagreements in regional stratigraphic schemes, the degree of completeness and reliability of the identified stratigraphic units are questionable, and therefore additional core, lithological, paleontological and stratigraphic studies are needed in the future. It is quite possible to use isotope geochronology methods, especially in the southern and southern-eastern parts of the Pre-Caspian basin, where there are different views on the structure and origin of the South Emba zone. The northwestern section also requires additional research, clarification of ages and correlation of horizons.
Paleozoic section , Pre-Caspian basin , stratigraphy , subsalt deposits
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Nostrum E&P Services LTD, Saint Petersburg, Russian Federation
Meridian Petroleum LLP, Almaty, Kazakhstan
Gubkin University, Moscow, Russian Federation
Nostrum E&P Services LTD
Meridian Petroleum LLP
Gubkin University
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