FEATURES OF THE GEOLOGICAL STRUCTURE OF THE UPPER DEEVONIAN RIPHOGENIC DEPOSITS OF THE TIMAN-PECHORSKY PETROLEUM PROVINCE
The problems of the structure of the Upper Devonian rifogenic deposits within the Moroshkinsky, Ust-Tsilemsky and Severo-Tebuksky reference areas located on the territory of the Komi Republic and the Nenets Autonomous District are considered. Based on the reinterpretation of the materials of wells geophysical research with the use of a core lithological description and results of its laboratory studies, the structure of the Domanik-Famennian part of the section is detailed, the correlation scheme of deep wells sections is presented. As a result of section correlation, some stratigraphic boundaries were corrected, the volume of lithological-stratigraphic units was determined, reference packs well displayed on geophysical diagrams, and traceable carbonate formations known to geologists as F1, F2, F3, F4, F5, as well as interstratal packs were identified. This paper presents the results of geochemical studies of the Upper Devonian rifogenic deposits of wells drilled on the territory of the Moroshkinsky, Ust-Tsilemsky and Severo-Tebuksky areas. The distribution of the organic carbon, chloroform and alcohol-benzene bitumoids content in the rocks of individual well horizons is presented, and the oil and gas potential of rocks is characterized by pyrolytic data. Based on a comprehensive analysis of the laboratory and analytical core studies results and materials from geophysical surveys, reservoirs were identified, their quantitative parameters and the nature of saturation were evaluated. The criterion for assessing the reservoir properties of rocks was the porosity coefficient. The determination of porosity by neutron gamma-ray logging was carried out using the method of two support layers using the dependencies of KamNIIKIGS JSC. To assess the quantitative parameters of carbonate reservoirs, the results of standard core studies were used: open porosity, absolute gas permeability, bulk density. The results of the research can be used when conducting exploration in the territory of three considered reference areas.