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Genèse des hydrocarbures des séries infrasalifères de la partie Est du bassin Précaspien (Kazakhstan)

Abstract : Aims of the thesis are the characterization of source rocks, of degree of maturity of the organic matter, the building of the genesis of hydrocarbons in the subsalt formations (Devonian, Carboniferous, Permien) of eastern part of the Precaspian Basin. This study allowed to determinate two facies of slope, the first (calciturbidites and breccia) during the Carboniferous and the second (turbidites) with downlap on the Carboniferous carbonated platform during the early Permian. The following formations were classed as source rocks : the calciturbidites of Serpukhovian, Bashkirian and Moscovian with organic matter (OM) of type II (marine); the turbidites of early and mid-Visean, and early Permian with OM of type III (continental) and mixture of type II and III. The turbiditic source rocks from Visean and early Permian are the most significant source of hydrocarbons. The source rocks correlate with the oil of the same age of reservoirs. The studied samples own generally a low maturity with Vitrinite reflectance lower than 0.75, Tmax lower than 435°C. The Precaspian basin seems the coldest, the Preuralian basin is the hottest under the thrust of Ural where these rocks are inside the gas window. This fact is confirmed by the Petromod modelling. After all these data, we can distinguish four zones in which the depths of the beginning and end of the oil window are different: the western zone (basin) from 4 - 9 km, the zone of slope and border from 3 - 5 km, Preuralian basin from 2,8 - 5 km, and the eastern zone under the thrust of Ural (Izembet) from 2 - 4 km. The ages of trapping of fluid inclusions correspond to Permien, which allow to estimate the periode of oil migration.
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Submitted on : Thursday, March 29, 2018 - 10:39:33 AM
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Talgat Yensepbayev. Genèse des hydrocarbures des séries infrasalifères de la partie Est du bassin Précaspien (Kazakhstan). Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10018⟩. ⟨tel-01746521⟩



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