A tectonic model for the structure of pre-jurassic sediments Suginsky small shaft, forecast of petroleum potential of the paleozoic

The aim of the work is to study the structural and tectonic features of the structure of the pre - Jurassic base of the Shuginsky small shaft, to develop criteria for the search for hydrocarbon deposits in the deep Paleozoic horizons. Collected and analyzed materials generalization of geological and geophysical data and research works on the study of pre-Jurassic sediments in the territory of the Yamal-Nenets Autonomous district and Western Siberia. The interpretation of 3D, 2D seismic materials in the range of the Paleozoic complex is carried out. For the first time, an upthrust-thrust structural-tectonic model of the pre-Jurassic complex was created, seismic complexes were identified: Triassic, Permian, Carbon, Devonian. General search criteria for the detection of hydrocarbon deposits in the pre-Jurassic YANAO complex have been developed. Discovered a new geological phenomenon within Shuginsky shaft - structure horizontal shear in the sedimentary cover, and unusual assemblage of structures in the basement - structure "propellers".
Materials and methods
Materials of deep exploratory, parametric and superdeep drilling, interpretation of the data of seismic exploration of MOGT 2D, 3D, analysis of the results of the most famous scientific research on the pre- Jurassic Foundation of Western Siberia.
Results
The analysis of geological models of hydrocarbon deposits in the pre-Jurassic complex in Shaim, Krasnoleninsky, Uvatsky, Nyurolsky, Yamalsky and other NGR is carried out, their seismic wave shape is defined. A scheme of zoning of the pre-Jurassic base of the investigated area is drawn up, according to which the base is composed of heterogeneous complexes under the pre- Jurassic erosion section, deposits: Triassic, Permian, Carboniferous and Devonian. Structural maps of the surfaces of seismic-stratigraphic complexes of the Paleozoic in the fault-block version are obtained. The paleotectonic analysis was carried out, as a result of which it was found out that the Shugin structure is the structure of inversion development. The dynamic analysis of reflected waves from the surface of Paleozoic complexes is carried out. Amplitude anomalies of seismic record, presumably associated with gas-saturated layers in the folded Paleozoic, are identified.
Conclusions
The search criteria for the forecast of perspective objects in the Paleozoic complex of Western Siberia are obtained. For the first time the thrust structural-tectonic model of the structure of the pre-Jurassic complex was built. It is concluded that the dynamic characteristics of the reflected waves of Paleozoic horizons are tecton-dependent. Selected promising sites in the deep horizons of the Paleozoic. The results of the research formed the basis for the development of a program of geological exploration on the site.