IDENTIFICATION OF STRUCTURAL TRAPS OF HYDROCARBONS BASED ON INTERPRETATION OF SEISMIC DATA FROM THE WESTERN ANGARA ZONE OF FOLDINGS (SIBERIAN PLATFORM)

M. I. Baranova

In the paper, the author analyses the geological-tectonic structure of the Siberian Platform sedimentary cover in the western part of the Irkineeva-Chadobets aulacogen within the eastern pericline of the Irkineeva structural nose. At the Abakansky license block there are southward-trending intercutenous wedges, which indicate lateral pressure from the north. Within the western termination of the Irkineeva structural nose in the Muntulskaya area there is an explored network of seismic profiles. Their interpretation enabled identification of a large high revealed from the lower horizons of the sedimentary cover and marked by contrast positive values in the gravimetric field. Study of seismic morphology of the Bichiley high as well as analysis of paragenesis of structures of the Angara zone of folding suggest that the nature of the high is associated with the lateral leftward trending of the identified sublatitudinal right shift and formation of compression duplex. The wedge-form structure of the sedimentary succession may be explained by the convergence of rigid Earths crust blocks-Baikit and Boguchany-Manza-and, consequently, forcing-out of the Riphean strata southwards and northwards from the sublatitudinal suture zone of the aulacogen with the formation and tectonic wedges and overthrusts. Previous study of the intercutenous wedge at the Abakanskoye field has revealed the high relevance of such structures in geological exploration for gas and indicates the adjacent areas as promising for wedge-type structural traps of hydrocarbons.

Key words: Irkineeva structural nose, intercutenous wedges, fold-sheet structure, displacement zone, structural traps of hydrocarbons.

DOI 10.20403/2078-0575-2016-1-36-43 

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