EVALUATION OF ENGINEERING-GEOCRYOLOGICAL CONDITIONS OF THE BEREGOVOE OIL AND GAS CONDENSATE FIELD

• Published in: Izvestiya Tomskogo Politekhnicheskogo Universiteta Inziniring Georesursov
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Tomsk Polytechnic University 2018
• Subjects: Soil; permafrost; dangerous cryogenic processes; engineering-geocryological mapping; engineering-geological conditions; Engineering geology. Rock mechanics. Soil mechanics. Underground construction; TA703-712; nenets; Nenets Autonomous Okrug; Yamalo Nenets; Yamalo-Nenets Autonomous Okrug
• Online Access: https://doi.org/10.18799/24131830/2018/12/5; https://doaj.org/article/bec3e06314b844a8ac98b63ace6e53f4

The relevance of the research is caused by the need to assess the existing engineering geological conditions, processes, and hazards, as well as the risks and impacts related with them with respect to the intended use of the site of the Beregovoe Field of Purovsky District, Yamalo-Nenets Autonomous Okrug. A necessary preliminary step in development of the project is the analysis of engineering-geological data of the construction site. The main aim of the research is to create the engineering­geological map of the deposit for assessing the situation and forecasting the changes engineering geological conditions according to the results of the performed geotechnical investigations. Objects of researches are surface features and subsurface earth materials for design and construction of the Beregovoe field exploration. Methods: the analysis of engineering-geological surveys, detailed lithological-genetic analysis of the territory, taking into account the regularities of the spatial variability of the main indicators of engineering-geological conditions (composition of soils, their temperature, distribution of permafrost and engineering-geological processes). Results. The authors identified six types of areas: A (lakes and marshes); B (drained lake); C (riverside); D (hilly ridge); E (linear ridge) and F (man-made soils). The results of the field works and laboratory investigations of geotechnical properties of soils allowed detailing a preliminary assessment of the engineering-geocryological conditions. The main part of the route passes through riparian areas С. The most unfavorable for construction of facilities and pipeline are terrain types: A (found locally in the lowlands, represented by marshes with a capacity of peat to 2,2 m) and B (has wide distribution, represented by wetlands, folded clay soils with no surface runoff). The types D and E are not met on the route. We recommend placing the linear structures of pipelines on well-drained upland sites spread thawed soils.