ROLE OF THRUST TECTONICS IN FORMATION OF HYDROCARBON AND HYDROMINERAL DEPOSITS IN THE SIBERIAN CRATON – CENTRAL ASIAN FOLD BELT TRANSITION ZONE

A comprehensive interpretation of modern geological and geophysical data served as a basis for refining a model of the deep structure of the junction zone between the Siberian craton and the Central Asian fold belt, which hosts the Kovykta gas condensate field (GCF). It has been found that hydrocarbon and hydromineral deposits in the allochthonous complexes are controlled by elements of the thrust system.

It has been shown that the Cenozoic tectonic reactivation plays a decisive role in the restructuring of the multi-stage natural reservoir system of the Kovykta field. Electrical prospecting methods have revealed the presence of modern highly conductive fluid migration channels both in the sedimentary cover and the basement. The inclined morphology of the conductors connecting the autochthonous and allochthonous reservoirs indicates the present-day hydrodynamic activity of the system. It is shown that evaporite leaching zones confined to thrust dislocations could serve as pathways for lateral and vertical hydrocarbon migration through the regional halogen fluid seal, thus contributing to thus contributing to the formation of secondary reservoirs in carbonate-sulfate sequences.

The obtained data are of importance in understanding the geodynamic evolution of reservoir filtration fields and minimizing geological risks when identifying new promising directions of petroleum exploration in the Angara-Lena and Nepa-Botuoba regions. A practical implication is the substantiation of shifting the exploration focus towards thrust-associated traps and the necessity of mapping active fluid-conducting systems.

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