Details of the abstract

Title of paper Assessment of geoelctric field variability in Yenisei-Khatanga oil and gas province and space weather hazards for infrastructure
List of authors Sokolova E., Marshalko E., Kozyreva O., Kupriyanov I., Epishkin D., Slinchuk G., Yakovlev D.
Affiliation(s) All-Russian Research Institute of Oil Geology, Finnish Meteorological Institute,
Schmidt Institute of Physics of the Earth, All-Russian Research Institute of Oil Geology, Nord West Ltd, Nord West Ltd, Nord West Ltd
Summary The geoelectric (telluric) field variability caused by the Earth’s magnetic field disturbances during space weather anomalies is analyzed for the area of Yenisei-Khatanga regional through (YKRT) - a perspective oil and gas-bearing province located in Siberian Arctic within the auroral zone. For the analysis of telluric fields and estimation of their extreme values, we use a unique experimental magnetotelluric impedance tensor database collected by Nord West Ltd during the regional stage of the geophysical investigations of the trough and adjacent territories. The geoelectric field spatial-frequency distributions on the Earth’s surface are calculated via the impedances and harmonic approximation of external geomagnetic excitation. The correlation of obtained distributions with geological map and MT array data helps to explain the position of the areas with maximal geoelectric field distortion accounting for their geological\geoelectrical heterogeneities.
Variations in time of telluric fields at a subset of YKRT MT sounding sites are synthesized via the impedance dependences on frequency and magnetic field time series recorded during intensive geomagnetic events at the nearest stationary monitoring sites. The snap-shoots of telluric field vectors’ spatial distribution are presented for the characteristic time steps of the geomagnetic variations considered, specific features of these distributions are outlined. As geoelectric responses to rapid changes of external magnetic field are the drivers of geomagnetically induced currents (the most serious threat to the grounded industrial constructions in subpolar regions) the results of the study can be used to mitigate possible damaging space weather effects on operating and projected YKRT infrastructure facilities.
Session Keyword 3.0 Exploration, Monitoring and Hazards
File upload 3.0_assessment_of_geoelctric_sokolova_03.pdf
Back