Facies modeling of the Temir carbonate platform based on the concept and principles of sequenсe stratigraphy

UDK: 551.263
DOI: 10.24887/0028-2448-2019-12-96-101
Key words: Caspian Depression, sequenсe stratigraphy, second carbonate stratum, carbonate sedimentation, reef
Authors: K.O. Iskaziev (National Company KazMunayGas JSC, Kazakhstan, Astana), L.A. Savinova (Gubkin University, RF, Moscow), D.O. Almazov (Gubkin University, RF, Moscow), U.V. Lyapunov (Gubkin University, RF, Moscow), M.P. Antipov (Geological Institute of RAS, RF, Moscow)

The article presents results of Temir area study. This area is isolated carbonate platforms type, so sedimentation is controlled by tectonic and eustatic sea level fluctuations. The structure of the Visean-Bashkirian complex of the Temir carbonate platform is considered on the bases of principles of sequential stratigraphic analysis. Seismic-stratigraphic interpretation of regional seismic lines and 3D seimic data including deep drilling data of five wells allowed to determine boundaries and internal structure features of the platform. The section of Visean-Bashkirian deposits is represented by carbonate rocks of various facial zones of an isolated platform – bioherms and their margin parts (boundstones, granestones), as well as adjacent lagoon and deep-sea areas (waxstones, packstones, mudstones). The general part of carbonate sedimentation and the formation of high-amplitude bioherms occurs during the period of high sea-level standing (HST), bioherms are formed in the side zones of the platform on the windward side, and small patch-reefs can appear in the central part. To sedimentation modelling, where zones of reef, slope and deep-water facies, as well as zones of high reservoir quality confined to the boundaries of complexes (SB), fundamental principles of carbonate sedimentation were used. A map of the deposits thicknesses between the reflecting horizons Р2 and Р2-1 has been compiled to estimate the total thickness of the Carboniferous carbonate deposits of the Temir area. Final facies maps, where the forecast of the development of the Visean-Bashkirian bioherms is given, were constructed based on studies conducted as part of this work.


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