APPLICATION OF CAPACITIVE RESISTIVITY TO IMPROVE THE EFFICIENCY OF GEOTECHNICAL MONITORING OF OIL AND GAS PIPELINES IN THE PERMAFROST ZONE
D.V. Kopylov1, M.R. Sadurtdinov2
1LLC “Meretoyakhaneftegaz”, Novyy Urengoy, Russia
2Tyumen Scientific Centre, Siberian Branch of the Russian Academy of Sciences, Earth Cryosphere Institute, Tyumen, Russia
Keywords: geotechnical monitoring, permafrost, frost heave, electromagnetic surveying, electrical resistivity, oil and gas infrastructure
Abstract
The application of capacitive resistivity surveying in conjunction with other methods of geotechnical monitoring of oil and gas gathering pipelines in the permafrost zone is considered to improve monitoring efficiency and informativeness. It is established that electromagnetic surveying is efficient to map frost-susceptible soils because of the dependence of electrical resistivity on the soil pore water content. The use of electrical resistivity allowed the identification of low-resistivity sections along the pipeline, where active frost jacking of the piles occurs. The proposed electrical surveying at shallow depths is effective to identify areas of frost-susceptible soils when used as part of an integrated geotechnical monitoring program.
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