Tectonic-sedimentary approach as a basis to study thinly bedded reservoirs with complex geological structure

The article is focused on studies of features of the formation of heterogeneous geological structures namely the "lake-type" turbidite reservoirs, with complex thin-layered structure. The study of geological features and geological and commercial characteristics of such reservoirs requires selection of effective research methods. The structural features of the turbidite complex are considered on the example of terrigenous Upper Miocene sediments of the Pannonian basin of the Republic of Serbia. Based on the results of the studies, we confirmed the relationship of the structural features of mosaic structure of the basement and deep fault systems with the complex structure of terrigenous deposits. Based on the analysis of geological and geophysical material, we proposed the use of facies and tectonic-structural analysis in the complex, as complementary procedures in the study of such deposits. To test the hypothesis of formation of strata in the turbidite system mode, a sedimentological analysis of object "X" was carried out and sedimentation conditions were determined, which led to a conclusion that the influence of tectonics dominates the sedimentation during the formation of a relatively deep epicontinental basin. In order to confirm the presence of the rotational component, a lineament analysis of the territory was performed, on the basis of which the hypothesis of the formation of local structures as a result of shear tectonic movements initiated by local protrusions of deep structures was formulated and justified. Promising areas for the next stage of additional exploration of the territory are identified, based on a comprehensive analysis of core research materials, well logging and seismic data. Further study of the northern part of the territory in accordance with the described approach will most likely contribute to the discovery of local hydrocarbon deposits.

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